141 files changed, 12666 insertions, 0 deletions
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/AbstractContract.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/AbstractContract.java
new file mode 100644
index 0000000000..30e2592008
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/AbstractContract.java
@@ -0,0 +1,77 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+import org.apache.tuscany.sca.interfacedef.InterfaceContract;
+import org.apache.tuscany.sca.policy.PolicySubject;
+
+/**
+ * Interface contracts define one or more business functions. These business
+ * functions are provided by services and are used by references.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface AbstractContract extends Base, Extensible, PolicySubject {
+
+    /**
+     * Returns the name of the contract.
+     * 
+     * @return the name of the contract
+     */
+    String getName();
+
+    /**
+     * Sets the name of the contract.
+     * 
+     * @param name the name of the contract
+     */
+    void setName(String name);
+
+    /**
+     * Returns the interface contract defining the interface and callback
+     * interface for the contract.
+     * 
+     * @return the interface contract
+     */
+    InterfaceContract getInterfaceContract();
+
+    /**
+     * Sets the interface contract defining the interface and callback
+     * interface for the contract.
+     * 
+     * @param interfaceContract the interface contract
+     */
+    void setInterfaceContract(InterfaceContract interfaceContract);
+
+    /**
+     * Returns true if this contract is a reference or service created internally
+     * to handle a callback interface of another contract, false otherwise.
+     * 
+     * @return true for a callback contract, false otherwise
+     */
+    boolean isForCallback();
+
+    /**
+     * Sets a flag indicating whether this is a callback contract.
+     * 
+     * @param isCallback true for a callback contract, false otherwise
+     */
+    void setForCallback(boolean isCallback);
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/AbstractProperty.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/AbstractProperty.java
new file mode 100644
index 0000000000..fcad39d8cb
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/AbstractProperty.java
@@ -0,0 +1,122 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+import javax.xml.namespace.QName;
+
+/**
+ * A property allows for the configuration of an implementation with externally
+ * set data values. An implementation can have zero or more properties. Each
+ * property has a data type, which may be either simple or complex. An
+ * implementation may also define a default value for a property.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface AbstractProperty extends Base, Extensible {
+
+    /**
+     * Returns the property name.
+     * 
+     * @return the property name
+     */
+    String getName();
+
+    /**
+     * Sets the property name.
+     * 
+     * @param name the property name
+     */
+    void setName(String name);
+
+    /**
+     * Returns the default value of the property.
+     * 
+     * @return the default value of this property
+     */
+    Object getValue();
+
+    /**
+     * Sets the default value of the property.
+     * 
+     * @param defaultValue the default value of this property
+     */
+    void setValue(Object defaultValue);
+
+    /**
+     * Returns true if the property allows multiple values.
+     * 
+     * @return true if the property allows multiple values
+     */
+    boolean isMany();
+
+    /**
+     * Sets whether or not the property allows multiple values.
+     * 
+     * @param many true if the property should allow multiple values
+     */
+    void setMany(boolean many);
+
+    /**
+     * Returns true if a value must be supplied for the property.
+     * 
+     * @return true is a value must be supplied for the property
+     */
+    boolean isMustSupply();
+
+    /**
+     * Sets whether a value must be supplied for the property.
+     * 
+     * @param mustSupply set to true to require that a value be supplied for
+     *            uses of this property
+     */
+    void setMustSupply(boolean mustSupply);
+
+    /**
+     * Returns the data type of this property. This is the qualified name of an
+     * XML schema type.
+     * 
+     * @return the type of this property
+     */
+    QName getXSDType();
+
+    /**
+     * Sets the data type of this property. This is the qualified name of an XML
+     * schema type.
+     * 
+     * @param type the type of this property
+     */
+    void setXSDType(QName type);
+
+    /**
+     * Returns the element defining the data type of this property. This is the
+     * qualified name of an XML schema element.
+     * 
+     * @return the element defining the type of this property
+     */
+    QName getXSDElement();
+
+    /**
+     * Sets the element defining the data type of this property. This is the
+     * qualified name of an XML schema element.
+     * 
+     * @param element the element defining the type of this property
+     */
+    void setXSDElement(QName element);
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/AbstractReference.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/AbstractReference.java
new file mode 100644
index 0000000000..a9ef26bbb9
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/AbstractReference.java
@@ -0,0 +1,43 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+/**
+ * Represents a reference contract.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface AbstractReference extends AbstractContract {
+
+    /**
+     * Returns the multiplicity allowed for wires connected to this reference.
+     * 
+     * @return the multiplicity allowed for wires connected to this reference
+     */
+    Multiplicity getMultiplicity();
+
+    /**
+     * Sets the multiplicity allowed for wires connected to this reference.
+     * 
+     * @param multiplicity the multiplicity allowed for wires connected to this
+     *            reference
+     */
+    void setMultiplicity(Multiplicity multiplicity);
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/AbstractService.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/AbstractService.java
new file mode 100644
index 0000000000..9ae511c07b
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/AbstractService.java
@@ -0,0 +1,28 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+/**
+ * Represents a service contract.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface AbstractService extends AbstractContract {
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/AssemblyFactory.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/AssemblyFactory.java
new file mode 100644
index 0000000000..7c0f7cf2ce
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/AssemblyFactory.java
@@ -0,0 +1,166 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+/**
+ * A factory for the assembly model
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface AssemblyFactory {
+
+    /**
+     * Create a new abstract property.
+     * 
+     * @return a new abstract property
+     */
+    AbstractProperty createAbstractProperty();
+
+    /**
+     * Create a new abstract reference.
+     * 
+     * @return a new abstract reference
+     */
+    AbstractReference createAbstractReference();
+
+    /**
+     * Create a new abstract service.
+     * 
+     * @return a new abstract service
+     */
+    AbstractService createAbstractService();
+
+    /**
+     * Create a new callback.
+     * 
+     * @return
+     */
+    Callback createCallback();
+
+    /**
+     * Create a new component.
+     * 
+     * @return a new component
+     */
+    Component createComponent();
+
+    /**
+     * Create a new component property.
+     * 
+     * @return a new component property
+     */
+    ComponentProperty createComponentProperty();
+
+    /**
+     * Create a new component reference.
+     * 
+     * @return a new component reference
+     */
+    ComponentReference createComponentReference();
+
+    /**
+     * Create a new component service.
+     * 
+     * @return a new component service
+     */
+    ComponentService createComponentService();
+
+    /**
+     * Create a new component type
+     * 
+     * @return a new component type
+     */
+    ComponentType createComponentType();
+
+    /**
+     * Create a new composite.
+     * 
+     * @return a new composite
+     */
+    Composite createComposite();
+
+    /**
+     * Create a new composite reference.
+     * 
+     * @return a new composite reference
+     */
+    CompositeReference createCompositeReference();
+
+    /**
+     * Create a new composite service.
+     * 
+     * @return a new composite service
+     */
+    CompositeService createCompositeService();
+
+    /**
+     * Create a new property.
+     * 
+     * @return a new property
+     */
+    Property createProperty();
+
+    /**
+     * Create a new reference.
+     * 
+     * @return a new reference
+     */
+    Reference createReference();
+
+    /**
+     * Create a new service.
+     * 
+     * @return a new service
+     */
+    Service createService();
+
+    /**
+     * Create a new wire.
+     * 
+     * @return a new wire
+     */
+    Wire createWire();
+
+    /**
+     * Create an Extension
+     * @return
+     */
+    Extension createExtension();
+
+    /**
+     * Create a new endpoint
+     * 
+     * @return a new endpoint
+     */
+    Endpoint createEndpoint();
+
+    /**
+     * Create a new endpoint reference
+     * 
+     * @return a new endpoint reference
+     */
+    EndpointReference createEndpointReference();
+
+    /** 
+     * Create a new configured operation.
+     * 
+     * @return a new ConfiguredOperation 
+     */
+    ConfiguredOperation createConfiguredOperation();
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Base.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Base.java
new file mode 100644
index 0000000000..96dc906395
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Base.java
@@ -0,0 +1,44 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.assembly;
+
+/**
+ * Base interface for all assembly model objects.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface Base {
+    String SCA11_NS = "http://docs.oasis-open.org/ns/opencsa/sca/200903";
+    String SCA11_TUSCANY_NS = "http://tuscany.apache.org/xmlns/sca/1.1";
+
+    /**
+     * Returns true if the model element is unresolved.
+     *
+     * @return true if the model element is unresolved.
+     */
+    boolean isUnresolved();
+
+    /**
+     * Sets whether the model element is unresolved.
+     *
+     * @param unresolved whether the model element is unresolved
+     */
+    void setUnresolved(boolean unresolved);
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Binding.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Binding.java
new file mode 100644
index 0000000000..5c5827637d
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Binding.java
@@ -0,0 +1,66 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.assembly;
+
+import javax.xml.namespace.QName;
+
+/**
+ * Represents a binding.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface Binding extends Base, Cloneable {
+
+    /**
+     * Returns the binding URI.
+     *
+     * @return the binding URI
+     */
+    String getURI();
+
+    /**
+     * Sets the binding URI.
+     *
+     * @param uri the binding URI
+     */
+    void setURI(String uri);
+
+    /**
+     * Returns the binding name.
+     *
+     * @return the binding name
+     */
+    String getName();
+
+    /**
+     * Sets the binding name.
+     *
+     * @param name the binding name
+     */
+    void setName(String name);
+
+    /**
+     * Clone the binding
+     *
+     * @return
+     */
+    Object clone() throws CloneNotSupportedException;
+
+    QName getType();
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/BindingRRB.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/BindingRRB.java
new file mode 100644
index 0000000000..35e5f148ba
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/BindingRRB.java
@@ -0,0 +1,42 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+/**
+ * TODO RRB experiment. 
+ * Represents a binding implemented using Request/Response binding chains
+ * Used to test the RRB idea hence no integrated into the Binding interface, yet
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface BindingRRB extends Binding {
+
+    WireFormat getRequestWireFormat();
+
+    void setRequestWireFormat(WireFormat wireFormat);
+
+    WireFormat getResponseWireFormat();
+
+    void setResponseWireFormat(WireFormat wireFormat);
+
+    OperationSelector getOperationSelector();
+
+    void setOperationSelector(OperationSelector operationSelector);
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Callback.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Callback.java
new file mode 100644
index 0000000000..d34ec7d01f
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Callback.java
@@ -0,0 +1,39 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+import java.util.List;
+
+import org.apache.tuscany.sca.policy.PolicySubject;
+
+/**
+ * Represents a callback object describing the bindings to use for callbacks.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface Callback extends Base, Extensible, PolicySubject {
+
+    /**
+     * Returns the bindings supported for callbacks.
+     * 
+     * @return the bindings supported for callbacks
+     */
+    List<Binding> getBindings();
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Component.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Component.java
new file mode 100644
index 0000000000..e2a68e2a4d
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Component.java
@@ -0,0 +1,141 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+import java.util.List;
+
+import org.apache.tuscany.sca.policy.PolicySubject;
+
+/**
+ * Represents a component. A component is a configured instance of an
+ * implementation.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface Component extends Base, Extensible, PolicySubject, Cloneable {
+
+    /**
+     * Returns the URI of the component.
+     *  
+     * @return the URI of the component
+     */
+    String getURI();
+
+    /**
+     * Sets the URI of the component.
+     * 
+     * @param uri the URI of the component
+     */
+    void setURI(String uri);
+
+    /**
+     * Returns the name of the component.
+     * 
+     * @return the name of the component
+     */
+    String getName();
+
+    /**
+     * Sets the name of the component.
+     * 
+     * @param name the name of the component
+     */
+    void setName(String name);
+
+    /**
+     * Returns the component implementation.
+     * 
+     * @return the component implementation
+     */
+    Implementation getImplementation();
+
+    /**
+     * Sets the component implementation
+     * 
+     * @param implementation the component implementation
+     */
+    void setImplementation(Implementation implementation);
+
+    /**
+     * Returns a list of references used by the component.
+     * 
+     * @return a list of references used by the component
+     */
+    List<ComponentReference> getReferences();
+    
+    /**
+     * Return a reference by name
+     * 
+     * @param name the reference name
+     * @return reference the reference
+     */
+    ComponentReference getReference(String name);    
+
+    /**
+     * Returns a list of services exposed by the component.
+     * 
+     * @return a list of services exposed by the component
+     */
+    List<ComponentService> getServices();
+    
+    /**
+     * Return a service by name
+     * 
+     * @param name the service name
+     * @return service the service
+     */
+    ComponentService getService(String name);    
+
+    /**
+     * Returns a list of properties for the component.
+     * 
+     * @return a list of properties
+     */
+    List<ComponentProperty> getProperties();
+    
+    /**
+     * Return a property by name
+     * 
+     * @param name the property name
+     * @return property the property
+     */
+    ComponentProperty getProperty(String name);    
+
+    /**
+     * Return the Boolean value of autowire
+     * @return null/TRUE/FALSE
+     */
+    Boolean getAutowire();
+
+    /**
+     * Sets whether component references should be autowired.
+     * 
+     * @param autowire whether component references should be autowired
+     */
+    void setAutowire(Boolean autowire);
+
+    /**
+     * Returns a clone of the component.
+     * 
+     * @return a clone of the component
+     * @throws CloneNotSupportedException
+     */
+    Object clone() throws CloneNotSupportedException;
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/ComponentProperty.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/ComponentProperty.java
new file mode 100644
index 0000000000..9a6ae4d35a
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/ComponentProperty.java
@@ -0,0 +1,88 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+import javax.xml.xpath.XPathExpression;
+
+/**
+ * Represents a configured property of a component.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface ComponentProperty extends Property {
+
+    /**
+     * Returns the property defined by the component implementation.
+     * 
+     * @return the property defined by the component implementation
+     */
+    Property getProperty();
+
+    /**
+     * Sets the property defined by this component implementation.
+     * 
+     * @param property the property defined by this component implementation
+     */
+    void setProperty(Property property);
+
+    /**
+     * Returns an XPath expression referencing a property of the enclosing
+     * composite.
+     * 
+     * @return an XPath expression referencing a property of the enclosing
+     *         composite
+     */
+    String getSource();
+
+    /**
+     * Sets an XPath expression referencing a property of the enclosing
+     * composite.
+     * 
+     * @param source an XPath expression referencing a property of the enclosing
+     *            composite
+     */
+    void setSource(String source);
+
+    /**
+     * Get the XPath expression for the source attribute
+     * @return the XPath expression for the source attribute
+     */
+    XPathExpression getSourceXPathExpression();
+
+    /**
+     * Set the XPath expression for the source attribute
+     * @param sourceXPathExpression the XPath expression for the source attribute
+     */
+    void setSourceXPathExpression(XPathExpression sourceXPathExpression);
+
+    /**
+     * Returns a URI to a file containing the property value.
+     * 
+     * @return a URI to a file containing the property value
+     */
+    String getFile();
+
+    /**
+     * Sets a URI to a file containing the property value.
+     * 
+     * @param file a URI to a file containing the property value
+     */
+    void setFile(String file);
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/ComponentReference.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/ComponentReference.java
new file mode 100644
index 0000000000..b204b649fe
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/ComponentReference.java
@@ -0,0 +1,112 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.assembly;
+
+/**
+ * An instance of a reference associated with a particular component.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface ComponentReference extends Reference {
+
+    /**
+     * Returns the reference defined by the implementation for this reference.
+     *
+     * @return the implementation reference
+     */
+    Reference getReference();
+
+    /**
+     * Sets the reference defined by the implementation for this reference.
+     *
+     * @param reference the implementation reference
+     */
+    void setReference(Reference reference);
+
+    /**
+     * Return the Boolean value of autowire
+     * @return null/TRUE/FALSE
+     */
+    Boolean getAutowire();
+
+    /**
+     * Sets whether component references should be autowired.
+     *
+     * @param autowire whether component references should be autowired
+     */
+    void setAutowire(Boolean autowire);
+
+    /**
+     * Returns the callback service created internally as a target endpoint
+     * for callbacks to this reference.
+     *
+     * @return the callback service
+     */
+    ComponentService getCallbackService();
+
+    /**
+     * Sets the callback service created internally as a target endpoint
+     * for callbacks to this reference.
+     *
+     * @param callbackService the callback service
+     */
+    void setCallbackService(ComponentService callbackService);
+
+    /**
+     * A boolean value, "false" by default, which indicates whether this component reference
+     * can have its targets overridden by a composite reference which promotes the
+     * component reference.
+     *
+     *  If @nonOverridable==false, the target(s) of the promoting composite reference
+     *  replace all the targets explicitly declared on the component reference for any
+     *  value of @multiplicity on the component reference.
+     *
+     *  If the component reference has @nonOverridable==false and @multiplicity 1..1
+     *  and the reference has a target, then any composite reference which promotes
+     *  the component reference has @multiplicity 0..1.by default and MAY have an explicit @multiplicity of either
+     *  0..1 or 1..1.
+     *
+     *  If @nonOverridable==true, and the component reference has @multiplicity 0..1 or
+     *  1..1 and the component reference also declares a target, promotion implies
+     *  that the promoting composite reference has @wiredbyImpl==true and the composite
+     *  reference cannot supply a target, but can influence the policy attached to the
+     *  component reference.
+     *
+     *  If @nonOverridable==true, and the component reference @multiplicity is 0..n
+     *  or 1..n, promotion targeting is additive
+     *
+     *  @return
+     */
+    boolean isNonOverridable();
+
+    /**
+     * Set the nonOverridable flag
+     * @param nonOverridable
+     */
+    void setNonOverridable(boolean nonOverridable);
+
+    /**
+     * Sets whether this Component Reference is promoted
+     * @param isPromoted - true if the component reference is promoted
+     */
+    void setPromoted(boolean isPromoted);
+
+    boolean isPromoted();
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/ComponentService.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/ComponentService.java
new file mode 100644
index 0000000000..022d829488
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/ComponentService.java
@@ -0,0 +1,58 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+/**
+ * An addressable instance of a service associated with a particular component.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface ComponentService extends Service {
+
+    /**
+     * Returns the service defined by the implementation for this service.
+     * 
+     * @return
+     */
+    Service getService();
+
+    /**
+     * Sets the service defined by the implementation for this service.
+     * 
+     * @param service
+     */
+    void setService(Service service);
+
+    /**
+     * Returns the callback reference created internally as a source endpoint
+     * for callbacks from this service.
+     * 
+     * @return the callback reference
+     */
+    ComponentReference getCallbackReference();
+
+    /**
+     * Sets the callback reference created internally as a source endpoint
+     * for callbacks from this service.
+     * 
+     * @param callbackReference the callback reference
+     */
+    void setCallbackReference(ComponentReference callbackReference);
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/ComponentType.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/ComponentType.java
new file mode 100644
index 0000000000..2a09b5bc6f
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/ComponentType.java
@@ -0,0 +1,89 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+import java.util.List;
+
+import org.apache.tuscany.sca.policy.PolicySubject;
+
+/**
+ * Describes an implementation and represents its configurable aspects.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface ComponentType extends Base, PolicySubject {
+
+    /**
+     * Returns the URI of this component type.
+     * @return the URI of the component type
+     */
+    String getURI();
+
+    /**
+     * Sets the URI of this component type.
+     * @param uri the URI of the component type
+     */
+    void setURI(String uri);
+
+    /**
+     * Returns a list of services that are offered.
+     * 
+     * @return a list of services that are offered
+     */
+    List<Service> getServices();
+    
+    /**
+     * Return a service by name
+     * 
+     * @param name the service name
+     * @return service the service
+     */
+    Service getService(String name);
+   
+    /**
+     * Returns the list of reference types that are used.
+     * 
+     * @return the list of reference types that are used
+     */
+    List<Reference> getReferences();
+    
+    /**
+     * Return a reference by name
+     * 
+     * @param name the reference name
+     * @return reference the reference
+     */
+    Reference getReference(String name);
+
+    /**
+     * Returns the list of properties that can be set.
+     * 
+     * @return the list of properties that can be set
+     */
+    List<Property> getProperties();
+    
+    /**
+     * Return a property by name
+     * 
+     * @param name the property name
+     * @return property the property
+     */
+    Property getProperty(String name);
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Composite.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Composite.java
new file mode 100644
index 0000000000..64a55f1b44
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Composite.java
@@ -0,0 +1,132 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.assembly;
+
+import java.util.List;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.policy.PolicySubject;
+
+/**
+ * Represents a composite.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface Composite extends Implementation, Extensible, Cloneable, PolicySubject {
+    /**
+     * Special name for the domain composite
+     */
+    QName DOMAIN_COMPOSITE = new QName(SCA11_NS, "");
+    QName TYPE = new QName(SCA11_NS, "implementation.composite");
+
+    /**
+     * Returns the spec version of the composite used to build this model
+     *
+     * @return the spec version used to build this model
+     */
+    String getSpecVersion();
+
+    /**
+     * Sets the spec version of the composite used to build this model
+     *
+     * @param specVersion the spec version used to build this model
+     */
+    void setSpecVersion(String specVersion);
+
+    /**
+     * Returns the name of the composite.
+     *
+     * @return the name of the composite
+     */
+    QName getName();
+
+    /**
+     * Sets the name of the composite.
+     *
+     * @param name the name of the composite
+     */
+    void setName(QName name);
+
+    /**
+     * Returns a list of composites included in this composite.
+     *
+     * @return a list of composites included in this composite.
+     */
+    List<Composite> getIncludes();
+
+    /**
+     * Returns a list of components contained in this composite.
+     *
+     * @return a list of components contained in this composite
+     */
+    List<Component> getComponents();
+    
+    /**
+     * Returns a component by name
+     */
+    Component getComponent(String name);
+    
+    /**
+     * Returns a list of wires contained in this composite.
+     *
+     * @return a list of wires contained in this composite
+     */
+    List<Wire> getWires();
+
+    /**
+     * Returns true if all the components within the composite must run in the
+     * same process.
+     *
+     * @return true if all the components within the composite must run in the
+     *         same process
+     */
+    boolean isLocal();
+
+    /**
+     * Sets whether all the components within the composite must run in the same
+     * process.
+     *
+     * @param local whether all the components within the composite must run in
+     *            the same process
+     */
+    void setLocal(boolean local);
+
+    /**
+     * Return the Boolean value of autowire
+     * @return null/TRUE/FALSE
+     */
+    Boolean getAutowire();
+
+    /**
+     * Sets whether component references should be autowired.
+     *
+     * @param autowire whether component references should be autowired
+     */
+    void setAutowire(Boolean autowire);
+
+    /**
+     * Returns a clone of the component type.
+     *
+     * @return a clone of the component type
+     * @throws CloneNotSupportedException
+     */
+    Object clone() throws CloneNotSupportedException;
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/CompositeReference.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/CompositeReference.java
new file mode 100644
index 0000000000..88cb2f9a2c
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/CompositeReference.java
@@ -0,0 +1,44 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+import java.util.List;
+
+/**
+ * Represents composite reference.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface CompositeReference extends Reference {
+    /**
+     * Returns the promoted components. For each promoted component/reference, 
+     * they have the same index in the component and reference list. 
+     *  
+     * @return the promoted components
+     */
+    List<Component> getPromotedComponents();
+
+    /**
+     * Returns the promoted component references.
+     * 
+     * @return the promoted component references
+     */
+    List<ComponentReference> getPromotedReferences();
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/CompositeService.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/CompositeService.java
new file mode 100644
index 0000000000..690316aca4
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/CompositeService.java
@@ -0,0 +1,56 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+/**
+ * Represents a composite service.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface CompositeService extends Service {
+
+    /**
+     * Returns the promoted component.
+     * 
+     * @return the promoted component.
+     */
+    Component getPromotedComponent();
+
+    /**
+     * Sets the promoted component
+     * 
+     * @param promotedComponent the promoted component.
+     */
+    void setPromotedComponent(Component promotedComponent);
+
+    /**
+     * Returns the promoted component service .
+     * 
+     * @return the promoted component service.
+     */
+    ComponentService getPromotedService();
+
+    /**
+     * Sets the promoted component service
+     * 
+     * @param promotedService the promoted component service.
+     */
+    void setPromotedService(ComponentService promotedService);
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/ConfiguredOperation.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/ConfiguredOperation.java
new file mode 100644
index 0000000000..9c8f6db912
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/ConfiguredOperation.java
@@ -0,0 +1,61 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+import org.apache.tuscany.sca.policy.PolicySubject;
+
+/**
+ * Represents an Operation. Typically Operation elements are used when there is a
+ * need to apply certain facets such as intents and policysets only to a specific
+ * operation provided by a service or reference.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface ConfiguredOperation extends Base, PolicySubject {
+    /**
+     * Returns the name of the operation.
+     * 
+     * @return the name of the operation
+     */
+    String getName();
+
+    /**
+     * Sets the name of the operation.
+     * 
+     * @param name the name of the operation
+     */
+    void setName(String name);
+    
+    /**
+     * Returns the name of the service or reference to which this operation belongs.
+     * This method is particularly useful when operation elements are specified under implementation
+     * elements and it is necessary to identify which of the various services provided by the 
+     * implementation is referred to by the operation element in question
+     * 
+     * @return the name of the contract to which this operation belongs
+     */
+    String getContractName();
+    
+    /**
+     * Sets the name of the service or reference to which this operation belongs.
+     * 
+     * @param contractName the name of the contract to which this operation belongs
+     */
+    void setContractName(String contractName);
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Contract.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Contract.java
new file mode 100644
index 0000000000..731c2986b5
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Contract.java
@@ -0,0 +1,110 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+import java.util.List;
+
+import org.apache.tuscany.sca.interfacedef.InterfaceContract;
+import org.apache.tuscany.sca.policy.PolicySubject;
+
+/**
+ * Represents a contract. A contract can be either a service or a reference.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface Contract extends AbstractContract, PolicySubject, Cloneable {
+
+    /**
+     * Returns the bindings supported by this contract.
+     * 
+     * @return the bindings supported by this contract
+     */
+    List<Binding> getBindings();
+
+    /**
+     * Returns a binding of the specified type or null if there is no such
+     * binding configured on this contract.
+     * 
+     * @param <B> the binding type
+     * @param bindingClass the binding type class
+     * @return the binding or null if there is no binding of the specified type
+     */
+    <B> B getBinding(Class<B> bindingClass);
+
+    /**
+     * Returns a callback binding of the specified type or null if there is no such
+     * callback binding configured on this contract.
+     * 
+     * @param <B> the callback binding type
+     * @param bindingClass the callback binding type class
+     * @return the callback binding or null if there is no callback binding of the specified type
+     */
+    <B> B getCallbackBinding(Class<B> bindingClass);
+
+    /**
+     * Returns a callback definition of the bindings to use for callbacks.
+     * 
+     * @return a definition of the bindings to use for callbacks
+     */
+    Callback getCallback();
+
+    /**
+     * Sets a callback definition of the bindings to use for callbacks
+     * 
+     * @param callback a definition of the bindings to use for callbacks
+     */
+    void setCallback(Callback callback);
+
+    /**
+     * Returns a clone of the contract.
+     * 
+     * @return a clone of the reference
+     * @throws CloneNotSupportedException
+     */
+    Object clone() throws CloneNotSupportedException;
+
+    /**
+     * Returns the interface contract given a binding. Important in the case where
+     * a reference with multiplicity > 1 has been promoted and has it's list of 
+     * resolved bindings extended by a promoting reference. Here the binding
+     * from the promoting reference may need the interface contract from the 
+     * promoting reference and not the promoted reference.
+     * TODO - remove this wrinkle with better endpoint support.  
+     * 
+     * @param binding the binding for which the interface contract is required
+     * @return the interface contract
+     */
+    InterfaceContract getInterfaceContract(Binding binding);
+    
+    /**
+     * A flag to tell if there are any binding elements specified for this service or reference. 
+     * If true, they override the the bindings in the corresponding reference/service in the 
+     * component type or promoted reference/service.  
+     * @return
+     */
+    boolean isOverridingBindings();
+    
+    /**
+     * Set the flag depending on if there are any binding elements specified for this service or 
+     * reference.
+     * @param overridingBindings true if there are binding elements specified
+     */
+    void setOverridingBindings(boolean overridingBindings);
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/DefaultAssemblyFactory.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/DefaultAssemblyFactory.java
new file mode 100644
index 0000000000..6d8350fc66
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/DefaultAssemblyFactory.java
@@ -0,0 +1,41 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.tuscany.sca.assembly;
+
+import org.apache.tuscany.sca.assembly.impl.AssemblyFactoryImpl;
+import org.apache.tuscany.sca.core.DefaultExtensionPointRegistry;
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+
+/**
+ * A factory for the assembly model.
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefaultAssemblyFactory extends AssemblyFactoryImpl implements AssemblyFactory {
+
+    public DefaultAssemblyFactory(ExtensionPointRegistry registry) {
+        super(registry);
+    }
+
+    public DefaultAssemblyFactory() {
+        super(new DefaultExtensionPointRegistry());
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/DistributedSCABinding.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/DistributedSCABinding.java
new file mode 100644
index 0000000000..5cc43d6333
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/DistributedSCABinding.java
@@ -0,0 +1,45 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.assembly;
+
+import javax.xml.namespace.QName;
+
+/**
+ * Represents an SCA binding used in the distributed runtime.
+ * It provides us with a sensibly named type against which
+ * distributed sca binding providers can be registered
+ *
+ * @version $Rev$ $Date$
+ */
+public interface DistributedSCABinding extends Binding {
+    QName TYPE = SCABinding.TYPE;
+
+    /**
+     * Return the wrapped SCA binding
+     * @return the SCA binding model element
+     */
+    SCABinding getSCABinding();
+
+    /**
+     * Set the wrapped SCA binding
+     * @param scaBinding the SCA binding model element
+     */
+    void setSCABinding(SCABinding scaBinding);
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Endpoint.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Endpoint.java
new file mode 100644
index 0000000000..59ab8d36fc
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Endpoint.java
@@ -0,0 +1,146 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.assembly;
+
+import java.io.Serializable;
+import java.util.List;
+
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.interfacedef.InterfaceContract;
+import org.apache.tuscany.sca.policy.PolicySubject;
+
+/**
+ * Represents a service endpoint which is what results from having a configured
+ * binding applied to a component service. In a deployed application an endpoint
+ * will relate directly to a physical endpoint, for example, a HTTP URL or a
+ * JMS destination.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface Endpoint extends Base, PolicySubject, Cloneable, Serializable {
+    /**
+     * Get the structural URI of the service binding
+     * @return structural URI of the service/binding
+     */
+    String getURI();
+
+    /**
+     * Set the structural URI of the service binding
+     * @param uri &lt;componentURI&gt;#service-binding(serviceName/bindingName)
+     * or &lt;componentURI&gt;#service(serviceName)
+     */
+    void setURI(String uri);
+
+    /**
+     * Get the component model object
+     *
+     * @return component
+     */
+    Component getComponent();
+
+    /**
+     * Set the component model object
+     *
+     * @param component
+     */
+    void setComponent(Component component);
+
+    /**
+     * Get the service model object
+     *
+     * @return service
+     */
+    ComponentService getService();
+
+    /**
+     * Set the service model object
+     *
+     * @param service
+     */
+    void setService(ComponentService service);
+
+    /**
+     * Get the resolved target binding
+     *
+     * @return target binding
+     */
+    Binding getBinding();
+
+    /**
+     * Set the binding
+     *
+     * @param  binding
+     */
+    void setBinding(Binding binding);
+
+    /**
+     * Returns the interface contract defining the interface
+     *
+     * @return the interface contract
+     */
+    InterfaceContract getInterfaceContract();
+
+    /**
+     * Sets the interface contract defining the interface
+     *
+     * @param interfaceContract the interface contract
+     */
+    void setInterfaceContract(InterfaceContract interfaceContract);
+
+    /**
+     * Get the service's callback endpoint references that
+     * represent endpoint references from which callbacks
+     * originate
+     *
+     * @return callbackEndpoint the reference callback endpoint
+     */
+    List<EndpointReference> getCallbackEndpointReferences();
+
+    /**
+     * Set the extension point registry against the endpoint after it is deserialized as
+     * the registry needs to be re-attached
+     *
+     * @param registry
+     */
+    void setExtensionPointRegistry(ExtensionPointRegistry registry);
+
+    /**
+     * Returns true if this endpoint represents a serivce that is not
+     * running in this JVM
+     * 
+     * @return true if the endpoint is remote
+     */
+    boolean isRemote();
+
+    /**
+     * Set true if this endpoint represents a serivce that is not
+     * running in this JVM
+     * 
+     * @param remote set to true if the endpoint is remote
+     */
+    void setRemote(boolean remote);
+
+    /**
+     * Supports endpoint cloning
+     *
+     * @return endpoint
+     * @throws CloneNotSupportedException
+     */
+    Object clone() throws CloneNotSupportedException;
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/EndpointReference.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/EndpointReference.java
new file mode 100644
index 0000000000..7b547e70de
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/EndpointReference.java
@@ -0,0 +1,189 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.assembly;
+
+import java.io.Serializable;
+
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.interfacedef.InterfaceContract;
+import org.apache.tuscany.sca.policy.PolicySubject;
+
+/**
+ * Represents an endpoint reference. An SCA reference can reference service endpoints in a
+ * number of ways. Target names, autowire, configured bindings. The endpoint reference
+ * captures the result of specifying one of these things.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface EndpointReference extends Base, PolicySubject, Cloneable, Serializable {
+
+    public static final int NOT_CONFIGURED = 0;
+    public static final int RESOLVED_BINDING = 1;
+    public static final int WIRED_TARGET_NOT_FOUND = 2;
+    public static final int WIRED_TARGET_FOUND_READY_FOR_MATCHING = 3;
+    public static final int WIRED_TARGET_FOUND_AND_MATCHED = 4;
+
+    /**
+     * Get the structural URI of the reference binding
+     * @return The structural URI of the reference/binding
+     */
+    String getURI();
+
+    /**
+     * Set the structural URI of the reference binding
+     * @param uri &lt;componentURI&gt;#reference-binding(referenceName/bindingName)
+     * or &lt;componentURI&gt;#reference(referenceName) if binding is not present
+     *
+     */
+    void setURI(String uri);
+
+    /**
+     * Supports endpoint reference cloning
+     *
+     * @return endpointReference
+     * @throws CloneNotSupportedException
+     */
+    Object clone() throws CloneNotSupportedException;
+
+    /**
+     * Get the component model object
+     *
+     * @return component
+     */
+    Component getComponent();
+
+    /**
+     * Set the  component model object
+     *
+     * @param component the component for the endpoint
+     */
+    void setComponent(Component component);
+
+    /**
+     * Get the source component reference model object
+     *
+     * @return reference the source component reference  for the endpoint
+     */
+    ComponentReference getReference();
+
+    /**
+     * Set the source component reference model object
+     *
+     * @param reference
+     */
+    void setReference(ComponentReference reference);
+
+    /**
+     * Get the resolved reference binding
+     *
+     * @return binding the resolved reference binding
+     */
+    Binding getBinding();
+
+    /**
+     * Set the resolved reference binding
+     *
+     * @param binding the resolved reference binding
+     */
+    void setBinding(Binding binding);
+
+    /**
+     * Get the target endpoint
+     *
+     * @return endpoint the target endpoint
+     */
+    Endpoint getTargetEndpoint();
+
+    /**
+     * Set the target endpoint model object
+     *
+     * @param endpoint the target endpoint
+     */
+    void setTargetEndpoint(Endpoint targetEndpoint);
+
+    /**
+     * Returns the interface contract defining the interface
+     *
+     * @return the interface contract
+     */
+    InterfaceContract getInterfaceContract();
+
+    /**
+     * Sets the interface contract defining the interface
+     *
+     * @param interfaceContract the interface contract
+     */
+    void setInterfaceContract(InterfaceContract interfaceContract);
+
+    /**
+     * Get the reference callback endpoint that
+     * represents that target endpoint to which callback
+     * messages will be directed
+     *
+     * @return callbackEndpoint the reference callback endpoint
+     */
+    Endpoint getCallbackEndpoint();
+
+    /**
+     * Set the reference callback endpoint
+     *
+     * @param callbackEndpoint the reference callback endpoint
+     */
+    void setCallbackEndpoint(Endpoint callbackEndpoint);
+
+    /**
+     * Returns true if this endpoint reference refers to an endpoint that 
+     * is not running in this endpoint reference
+     * 
+     * @return true if the endpoint is remote
+     */
+    boolean isRemote();
+
+    /**
+     * Set true if this endpoint reference refers to an endpoint that 
+     * is not running in this endpoint reference
+     * 
+     * @param remote set to true if the endpoint is remote
+     */
+    void setRemote(boolean remote);
+
+    /**
+     * Set the extension point registry against the endpoint after it is deserialized as
+     * the registry needs to be re-attached
+     *
+     * @param registry
+     */
+    void setExtensionPointRegistry(ExtensionPointRegistry registry);
+
+    /**
+     * Rather than relying on combinations of unresolved flags and 
+     * other data we maintain a status enumeration
+     * 
+     * @return status
+     */
+    int getStatus();
+
+    /**
+     * Rather than relying on combinations of unresolved flags and 
+     * other data we maintain a status enumeration
+     * 
+     * @param status the new status
+     */
+    void setStatus(int status);
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Extensible.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Extensible.java
new file mode 100644
index 0000000000..9476251305
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Extensible.java
@@ -0,0 +1,44 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+import java.util.List;
+
+/**
+ * Base interface for extensible assembly model objects.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface Extensible extends Base {
+
+    /**
+     * Returns a list of extension objects contained in this model object.
+     * 
+     * @return a list of extension objects container in this model object
+     */
+    List<Object> getExtensions();
+
+    /**
+     * Returns a list of attribute extensions contained in this model object
+     * 
+     * @return a list of attribute extensions contained in this model object
+     */
+    List<Extension> getAttributeExtensions();
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Extension.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Extension.java
new file mode 100644
index 0000000000..4d5b1a2ecd
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Extension.java
@@ -0,0 +1,65 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+import javax.xml.namespace.QName;
+
+/**
+ * Base interface for storing contents of extensible assembly model objects.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface Extension {
+
+    /**
+     * Return QName for the extension
+     * @return the extension QName
+     */
+    QName getQName();
+
+    /**
+     * Set QName for the extension
+     * @param qName the extension QName
+     */
+    void setQName(QName qName);
+
+    /**
+     * Return the original extension value
+     * @return the extension value
+     */
+    <T> T getValue();
+
+    /**
+     * Set the original extension value
+     * @param value the extension value
+     */
+    <T> void setValue(T value);
+
+    /**
+     * Return whether or not the extension is an attribute
+     * @return 
+     */
+    boolean isAttribute();
+
+    /**
+     * Set whether or not the extension is an attribute
+     * @param value
+     */
+    void setAttribute(boolean isAttribute);
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Implementation.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Implementation.java
new file mode 100644
index 0000000000..2d918a0592
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Implementation.java
@@ -0,0 +1,35 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.assembly;
+
+import java.util.List;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.interfacedef.Operation;
+
+/**
+ * Represents a component implementation.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface Implementation extends ComponentType {
+    QName getType();
+    List<Operation> getOperations();
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Multiplicity.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Multiplicity.java
new file mode 100644
index 0000000000..5d15ce9938
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Multiplicity.java
@@ -0,0 +1,49 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+/**
+ * Enumeration for multiplicity. Defines the number of wires that can connect a
+ * reference to target services.
+ * 
+ * @version $Rev$ $Date$
+ */
+public enum Multiplicity {
+
+    /**
+     * Zero or one wire can have the reference as a source.
+     */
+    ZERO_ONE,
+
+    /**
+     * The default setting, one wire can have the reference as a source.
+     */
+    ONE_ONE,
+
+    /**
+     * Zero or more wires can have the reference as a source.
+     */
+    ZERO_N,
+
+    /**
+     * One or more wires can have the reference as a source.
+     */
+    ONE_N
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/OperationSelector.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/OperationSelector.java
new file mode 100644
index 0000000000..f72b78cc3a
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/OperationSelector.java
@@ -0,0 +1,28 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+/**
+ * Represents an operationSelector
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface OperationSelector extends Base, Cloneable {
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/OperationsConfigurator.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/OperationsConfigurator.java
new file mode 100644
index 0000000000..947fcd4c7c
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/OperationsConfigurator.java
@@ -0,0 +1,33 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.assembly;
+
+import java.util.List;
+
+/**
+ * Interface to be implemented by SCA artifacts that support configuration of 'operation' child
+ * elements for policies etc. 
+ *
+ * @version $Rev$ $Date$
+ */
+
+public interface OperationsConfigurator {
+    List<ConfiguredOperation> getConfiguredOperations();
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/OptimizableBinding.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/OptimizableBinding.java
new file mode 100644
index 0000000000..f997d03786
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/OptimizableBinding.java
@@ -0,0 +1,66 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+/**
+ * Represent a reference binding that supports optimized SCA local wiring between component 
+ * references and services 
+ * 
+ * @version $Rev$ $Date$
+ * 
+ */
+public interface OptimizableBinding extends Binding, Cloneable {
+
+    /**
+     * @param component
+     */
+    void setTargetComponent(Component component);
+
+    /**
+     * @param service
+     */
+    void setTargetComponentService(ComponentService service);
+
+    /**
+     * @param binding
+     */
+    void setTargetBinding(Binding binding);
+
+    /**
+     * @return
+     */
+    Binding getTargetBinding();
+
+    /**
+     * @return
+     */
+    Component getTargetComponent();
+
+    /**
+     * @return
+     */
+    ComponentService getTargetComponentService();
+
+    /**
+     * Clone the binding
+     * @return
+     */
+    Object clone() throws CloneNotSupportedException;
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Property.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Property.java
new file mode 100644
index 0000000000..9d1b3ac20c
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Property.java
@@ -0,0 +1,39 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+/**
+ * A property allows for the configuration of an implementation with externally
+ * set data values. An implementation can have zero or more properties. Each
+ * property has a data type, which may be either simple or complex. An
+ * implementation may also define a default value for a property.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface Property extends AbstractProperty, Cloneable {
+
+    /**
+     * Returns a clone of the property.
+     * 
+     * @return a clone of the property
+     * @throws CloneNotSupportedException
+     */
+    Object clone() throws CloneNotSupportedException;
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Reference.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Reference.java
new file mode 100644
index 0000000000..702826d43e
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Reference.java
@@ -0,0 +1,87 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+import java.util.List;
+
+/**
+ * Represents a reference. References within an implementation represent links
+ * to services that the implementation uses that must be provided by other
+ * components.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface Reference extends AbstractReference, Contract {
+
+    /**
+     * Returns a boolean value, "false" by default, which indicates that the
+     * implementation wires this reference dynamically.
+     * 
+     * @return true if the implementation wires this reference dynamically
+     */
+    boolean isWiredByImpl();
+
+    /**
+     * Sets a boolean value, "false" by default, which indicates that the
+     * implementation wires this reference dynamically.
+     * 
+     * @param wiredByImpl whether the implementation wires this reference
+     *            dynamically
+     */
+    void setWiredByImpl(boolean wiredByImpl);
+
+    /**
+     * Returns a boolean value, "false" by default, which indicates whether
+     * the configuration of this reference is a promotion override for
+     * another more deeply nested reference.
+     * 
+     * @return true if the reference is a promotion override
+     */
+    boolean isPromotionOverride();
+
+    /**
+     * Sets a boolean value, "false" by default, which indicates whether
+     * the configuration of this reference is a promotion override for
+     * another more deeply nested reference.
+     * 
+     * @param promotionOverride whether the reference is a promotion override
+     */
+    void setPromotionOverride(boolean promotionOverride);
+
+    /**
+     * Returns the targets of this reference.
+     * 
+     * @return the targets of this reference.
+     */
+    List<ComponentService> getTargets();
+
+    /**
+     * Returns the endpoint references implied by this reference.
+     *  
+     * Endpoint references are used to represent:
+     * 
+     *   - manually specified reference targets
+     *   - reference targets determined by autowire
+     *   - manually configured remote bindings
+     *   
+     * @return the endpoint references implied by this reference
+     */
+    List<EndpointReference> getEndpointReferences();
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/SCABinding.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/SCABinding.java
new file mode 100644
index 0000000000..aa356e3857
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/SCABinding.java
@@ -0,0 +1,30 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.assembly;
+
+import javax.xml.namespace.QName;
+
+/**
+ * Represents an SCA binding.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface SCABinding extends Binding {
+    QName TYPE = new QName(SCA11_NS, "binding.sca");
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/SCABindingFactory.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/SCABindingFactory.java
new file mode 100644
index 0000000000..176770e553
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/SCABindingFactory.java
@@ -0,0 +1,37 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.assembly;
+
+/**
+ * A factory for the SCA binding model
+ *
+ * @version $Rev$ $Date$
+ */
+public interface SCABindingFactory {
+
+    /**
+     * Create a new SCA binding.
+     *
+     * @return a new SCA binding
+     */
+    SCABinding createSCABinding();
+
+    DistributedSCABinding createDistributedSCABinding();
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Service.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Service.java
new file mode 100644
index 0000000000..5069b92a50
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Service.java
@@ -0,0 +1,41 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+import java.util.List;
+
+/**
+ * Represents a service. Services are used to publish services provided by
+ * implementations, so that they are addressable by other components.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface Service extends AbstractService, Contract {
+    /**
+     * Returns the endpoints implied by this service.
+     * 
+     * Endpoints represent configured bindings for a service. Hence a service
+     * with two bindings will expose two Endpoints. Where a promoted service has 
+     * new binding configuration applied by a promoting component Endpoints are
+     * introduced to represent these new bindings.  
+     * 
+     * @return the endpoints implied by this service
+     */
+    List<Endpoint> getEndpoints();
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Wire.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Wire.java
new file mode 100644
index 0000000000..075b50eec1
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/Wire.java
@@ -0,0 +1,85 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+import org.apache.tuscany.sca.policy.PolicySubject;
+
+/**
+ * Represents a wire.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface Wire extends Base, Extensible, PolicySubject, Cloneable {
+
+    /**
+     * Returns the source of the wire.
+     * 
+     * @return the source of the wire
+     */
+    ComponentReference getSource();
+
+    /**
+     * Sets the source of the wire.
+     * 
+     * @param source the source of the wire
+     */
+    void setSource(ComponentReference source);
+
+    /**
+     * Returns the target of the wire.
+     * 
+     * @return the target of the wire
+     */
+    ComponentService getTarget();
+
+    /**
+     * Sets the target of the wire.
+     * 
+     * @param target the target of the wire
+     */
+    void setTarget(ComponentService target);
+
+    /**
+     * A boolean value, with the default of "false". When a wire element has
+     * @replace="false", the wire is added to the set of wires which apply to 
+     * the reference identified by the @source attribute. When a wire element 
+     * has @replace="true", the wire is added to the set of wires which apply to 
+     * the reference identified by the @source attribute - but any wires for that 
+     * reference specified by means of the @target attribute of the reference 
+     * are removed from the set of wires which apply to the reference.
+     * 
+     * @return
+     */
+    boolean isReplace();
+
+    /**
+     * Set the replace flag for the wire 
+     * @param replace
+     */
+    void setReplace(boolean replace);
+
+    /**
+     * Returns a clone of the wire.
+     * 
+     * @return a clone of the wire
+     * @throws CloneNotSupportedException
+     */
+    Object clone() throws CloneNotSupportedException;
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/WireFormat.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/WireFormat.java
new file mode 100644
index 0000000000..fc03bfeb88
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/WireFormat.java
@@ -0,0 +1,28 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly;
+
+/**
+ * Represents a wireFormat.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface WireFormat extends Base, Cloneable {
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/BindingBuilder.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/BindingBuilder.java
new file mode 100644
index 0000000000..5f10af6510
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/BindingBuilder.java
@@ -0,0 +1,50 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.assembly.builder;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.assembly.Binding;
+import org.apache.tuscany.sca.assembly.Component;
+import org.apache.tuscany.sca.assembly.Contract;
+
+/**
+ * A builder that handles any build-time configuration needed by bindings.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface BindingBuilder<B extends Binding> {
+
+    /**
+     * Configure a binding.
+     * 
+     * @param component The component for the binding's service or reference
+     * @param contract The binding's service or reference
+     * @param context TODO
+     */
+    void build(Component component, Contract contract, B binding, BuilderContext context);
+
+    /**
+     * Get QName of the binding type
+     * @return
+     */
+    QName getBindingType();
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/BuilderContext.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/BuilderContext.java
new file mode 100644
index 0000000000..8a16fac9e4
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/BuilderContext.java
@@ -0,0 +1,95 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.assembly.builder;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.core.UtilityExtensionPoint;
+import org.apache.tuscany.sca.definitions.Definitions;
+import org.apache.tuscany.sca.monitor.DefaultMonitorFactory;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.monitor.MonitorFactory;
+
+/**
+ * 
+ */
+public class BuilderContext {
+    protected Definitions definitions;
+    protected Map<QName, List<String>> bindingBaseURIs = Collections.emptyMap();
+    protected Monitor monitor;
+
+    /**
+     * @param definitions
+     * @param bindingBaseURIs
+     * @param monitor
+     */
+    public BuilderContext(Definitions definitions, Map<QName, List<String>> bindingBaseURIs, Monitor monitor) {
+        super();
+        this.definitions = definitions;
+        if (bindingBaseURIs != null) {
+            this.bindingBaseURIs = bindingBaseURIs;
+        }
+        this.monitor = monitor;
+    }
+
+    public BuilderContext(Monitor monitor) {
+        super();
+        this.monitor = monitor;
+    }
+
+    public BuilderContext(ExtensionPointRegistry registry) {
+        super();
+        MonitorFactory monitorFactory =
+            registry.getExtensionPoint(UtilityExtensionPoint.class).getUtility(MonitorFactory.class);
+        this.monitor = monitorFactory.createMonitor();
+    }
+
+    public BuilderContext() {
+        super();
+        this.monitor = new DefaultMonitorFactory().createMonitor();
+    }
+
+    public Monitor getMonitor() {
+        return monitor;
+    }
+
+    public Monitor setMonitor(Monitor monitor) {
+        Monitor old = this.monitor;
+        this.monitor = monitor;
+        return old;
+    }
+
+    public Definitions getDefinitions() {
+        return definitions;
+    }
+
+    public Map<QName, List<String>> getBindingBaseURIs() {
+        return bindingBaseURIs;
+    }
+
+    public void setDefinitions(Definitions definitions) {
+        this.definitions = definitions;
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/BuilderExtensionPoint.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/BuilderExtensionPoint.java
new file mode 100644
index 0000000000..ae526b92a1
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/BuilderExtensionPoint.java
@@ -0,0 +1,118 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.assembly.builder;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.assembly.Binding;
+import org.apache.tuscany.sca.assembly.Implementation;
+
+/**
+ * An extension point for Composite builders.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface BuilderExtensionPoint {
+
+    /**
+     * Adds a composite builder.
+     * 
+     * @param compositeBuilder
+     */
+    void addCompositeBuilder(CompositeBuilder compositeBuilder);
+
+    /**
+     * Removes a composite builder.
+     *  
+     * @param compositeBuilder
+     */
+    void removeCompositeBuilder(CompositeBuilder compositeBuilder);
+
+    /**
+     * Returns the composite builder with the given id.
+     * 
+     * @param id
+     * @return
+     */
+    CompositeBuilder getCompositeBuilder(String id);
+    
+    /**
+     * Add a binding builder
+     * @param bindingBuilder
+     */
+    void addBindingBuilder(BindingBuilder<?> bindingBuilder);
+
+    /**
+     * Look up a binding builder by the binding type
+     * @param <B>
+     * @param bindingType
+     * @return
+     */
+    <B extends Binding> BindingBuilder<B> getBindingBuilder(QName bindingType);
+
+    /**
+     * Remove a binding builder
+     * @param <B>
+     * @param builder
+     */
+    <B extends Binding> void removeBindingBuilder(BindingBuilder<B> builder);
+
+    /**
+     * Add an implementation builder
+     * @param implementationBuilder
+     */
+    void addImplementationBuilder(ImplementationBuilder<?> implementationBuilder);
+
+    /**
+     * Look up an implementation builder by implementation type
+     * @param <I>
+     * @param implementationType
+     * @return
+     */
+    <I extends Implementation> ImplementationBuilder<I> getImplementationBuilder(QName implementationType);
+
+    /**
+     * Remove an implementation builder
+     * @param <I>
+     * @param builder
+     */
+    <I extends Implementation> void removeImplementationBuilder(ImplementationBuilder<I> builder);
+    
+    /**
+     * Add a policy builder
+     * @param policyBuilder
+     */
+    void addPolicyBuilder(PolicyBuilder<?> policyBuilder);
+
+    /**
+     * Look up a Policy builder by the Policy type
+     * @param <P>
+     * @param policyType
+     * @return
+     */
+    <P> PolicyBuilder<P> getPolicyBuilder(QName policyType);
+
+    /**
+     * Remove a Policy builder
+     * @param <P>
+     * @param builder
+     */
+    <P> void removePolicyBuilder(PolicyBuilder<P> builder);
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/CompositeBuilder.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/CompositeBuilder.java
new file mode 100644
index 0000000000..50bf10f54a
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/CompositeBuilder.java
@@ -0,0 +1,51 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.assembly.builder;
+
+import org.apache.tuscany.sca.assembly.Composite;
+
+/**
+ * A builder that handles the configuration of the components inside a
+ * composite and the wiring of component references to component services.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface CompositeBuilder {
+
+    /**
+     * Returns the ID of the builder.
+     * 
+     * @return An ID that identifies the builder
+     */
+    String getID();
+
+    /**
+     * Build a composite.
+     * 
+     * @param composite The composite
+     * @param context The builder context
+     * @return The composite built from the original one. In most cases, it is the same as the orginal one as
+     * most builders only change the content of the composite. 
+     * 
+     * @throws CompositeBuilderException
+     */
+    Composite build(Composite composite, BuilderContext context) throws CompositeBuilderException;
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/CompositeBuilderException.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/CompositeBuilderException.java
new file mode 100644
index 0000000000..5a2015f55e
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/CompositeBuilderException.java
@@ -0,0 +1,45 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.assembly.builder;
+
+/**
+ * Reports a composite builder exception.
+ *
+ * @version $Rev$ $Date$
+ */
+public class CompositeBuilderException extends Exception {
+    private static final long serialVersionUID = -8916323176803443856L;
+
+    public CompositeBuilderException() {
+    }
+
+    public CompositeBuilderException(String message) {
+        super(message);
+    }
+
+    public CompositeBuilderException(Throwable cause) {
+        super(cause);
+    }
+
+    public CompositeBuilderException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/DefaultBuilderExtensionPoint.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/DefaultBuilderExtensionPoint.java
new file mode 100644
index 0000000000..8afe493dec
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/DefaultBuilderExtensionPoint.java
@@ -0,0 +1,395 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.tuscany.sca.assembly.builder;
+
+import java.lang.reflect.Constructor;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.assembly.Binding;
+import org.apache.tuscany.sca.assembly.Component;
+import org.apache.tuscany.sca.assembly.Composite;
+import org.apache.tuscany.sca.assembly.Contract;
+import org.apache.tuscany.sca.assembly.Endpoint;
+import org.apache.tuscany.sca.assembly.Implementation;
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+import org.apache.tuscany.sca.core.LifeCycleListener;
+import org.apache.tuscany.sca.core.UtilityExtensionPoint;
+import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
+import org.apache.tuscany.sca.extensibility.ServiceDeclarationParser;
+import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
+import org.apache.tuscany.sca.interfacedef.InterfaceContractMapper;
+
+/**
+ * Default implementation of a provider factory extension point.
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefaultBuilderExtensionPoint implements BuilderExtensionPoint, LifeCycleListener {
+
+    private ExtensionPointRegistry registry;
+    private final Map<String, CompositeBuilder> builders = new HashMap<String, CompositeBuilder>();
+    private final Map<QName, BindingBuilder> bindingBuilders = new HashMap<QName, BindingBuilder>();
+    private final Map<QName, ImplementationBuilder> implementationBuilders =
+        new HashMap<QName, ImplementationBuilder>();
+    private final Map<QName, PolicyBuilder> policyBuilders = new HashMap<QName, PolicyBuilder>();
+
+    private boolean loaded;
+
+    public DefaultBuilderExtensionPoint(ExtensionPointRegistry registry) {
+        this.registry = registry;
+    }
+
+    public void start() {
+    }
+
+    public void stop() {
+        builders.clear();
+        bindingBuilders.clear();
+        implementationBuilders.clear();
+        loaded = false;
+    }
+
+    public void addCompositeBuilder(CompositeBuilder builder) {
+        builders.put(builder.getID(), builder);
+    }
+
+    public void removeCompositeBuilder(CompositeBuilder builder) {
+        builders.remove(builder.getID());
+    }
+
+    public CompositeBuilder getCompositeBuilder(String id) {
+        loadBuilders();
+        return builders.get(id);
+    }
+
+    /**
+     * Load builders declared under META-INF/services.
+     */
+    private synchronized void loadBuilders() {
+        if (loaded)
+            return;
+
+        FactoryExtensionPoint factories = registry.getExtensionPoint(FactoryExtensionPoint.class);
+
+        UtilityExtensionPoint utils = registry.getExtensionPoint(UtilityExtensionPoint.class);
+        InterfaceContractMapper mapper = utils.getUtility(InterfaceContractMapper.class);
+
+        // Get the provider factory service declarations
+        Collection<ServiceDeclaration> builderDeclarations;
+        ServiceDiscovery serviceDiscovery = registry.getServiceDiscovery();
+        try {
+            builderDeclarations = serviceDiscovery.getServiceDeclarations(CompositeBuilder.class.getName());
+        } catch (Exception e) {
+            throw new IllegalStateException(e);
+        }
+
+        for (ServiceDeclaration builderDeclaration : builderDeclarations) {
+            Map<String, String> attributes = builderDeclaration.getAttributes();
+            String id = attributes.get("id");
+
+            CompositeBuilder builder = new LazyCompositeBuilder(id, builderDeclaration, this, factories, mapper);
+            builders.put(id, builder);
+        }
+
+        try {
+            builderDeclarations = serviceDiscovery.getServiceDeclarations(BindingBuilder.class);
+        } catch (Exception e) {
+            throw new IllegalStateException(e);
+        }
+
+        for (ServiceDeclaration builderDeclaration : builderDeclarations) {
+            BindingBuilder<?> builder = new LazyBindingBuilder(builderDeclaration);
+            bindingBuilders.put(builder.getBindingType(), builder);
+        }
+
+        try {
+            builderDeclarations = serviceDiscovery.getServiceDeclarations(ImplementationBuilder.class);
+        } catch (Exception e) {
+            throw new IllegalStateException(e);
+        }
+
+        for (ServiceDeclaration builderDeclaration : builderDeclarations) {
+            ImplementationBuilder<?> builder = new LazyImplementationBuilder(builderDeclaration);
+            implementationBuilders.put(builder.getImplementationType(), builder);
+        }
+        
+        try {
+            builderDeclarations = serviceDiscovery.getServiceDeclarations(PolicyBuilder.class);
+        } catch (Exception e) {
+            throw new IllegalStateException(e);
+        }
+
+        for (ServiceDeclaration builderDeclaration : builderDeclarations) {
+            PolicyBuilder<?> builder = new LazyPolicyBuilder(builderDeclaration);
+            policyBuilders.put(builder.getPolicyType(), builder);
+        }
+
+
+        loaded = true;
+
+    }
+
+    public void addBindingBuilder(BindingBuilder<?> bindingBuilder) {
+        bindingBuilders.put(bindingBuilder.getBindingType(), bindingBuilder);
+    }
+    
+    public <B extends Binding> BindingBuilder<B> getBindingBuilder(QName bindingType) {
+        loadBuilders();
+        return (BindingBuilder<B>)bindingBuilders.get(bindingType);
+    }
+
+    public <B extends Binding> void removeBindingBuilder(BindingBuilder<B> builder) {
+        bindingBuilders.remove(builder.getBindingType());
+    }
+
+    public void addImplementationBuilder(ImplementationBuilder<?> implementationBuilder) {
+        implementationBuilders.put(implementationBuilder.getImplementationType(), implementationBuilder);
+    }
+
+    public <I extends Implementation> ImplementationBuilder<I> getImplementationBuilder(QName implementationType) {
+        loadBuilders();
+        return (ImplementationBuilder<I>)implementationBuilders.get(implementationType);
+    }
+
+    public <I extends Implementation> void removeImplementationBuilder(ImplementationBuilder<I> builder) {
+        implementationBuilders.remove(builder.getImplementationType());
+    }
+
+    public void addPolicyBuilder(PolicyBuilder<?> policyBuilder) {
+        policyBuilders.put(policyBuilder.getPolicyType(), policyBuilder);
+    }
+
+    public <B> PolicyBuilder<B> getPolicyBuilder(QName policyType) {
+        loadBuilders();
+        return (PolicyBuilder<B>)policyBuilders.get(policyType);
+    }
+
+    public <B> void removePolicyBuilder(PolicyBuilder<B> builder) {
+        policyBuilders.remove(builder.getPolicyType());
+    }
+    
+    /**
+     * A wrapper around a composite builder allowing lazy
+     * loading and initialization of implementation providers.
+     */
+    private class LazyCompositeBuilder implements CompositeBuilder {
+
+        private FactoryExtensionPoint factories;
+        private InterfaceContractMapper mapper;
+        private String id;
+        private ServiceDeclaration builderDeclaration;
+        private CompositeBuilder builder;
+        private BuilderExtensionPoint builders;
+
+        private LazyCompositeBuilder(String id,
+                                     ServiceDeclaration factoryDeclaration,
+                                     BuilderExtensionPoint builders,
+                                     FactoryExtensionPoint factories,
+                                     InterfaceContractMapper mapper) {
+            this.id = id;
+            this.builderDeclaration = factoryDeclaration;
+            this.builders = builders;
+            this.factories = factories;
+            this.mapper = mapper;
+        }
+
+        public String getID() {
+            return id;
+        }
+
+        public Composite build(Composite composite, BuilderContext context)
+            throws CompositeBuilderException {
+            return getBuilder().build(composite, context);
+        }
+
+        private CompositeBuilder getBuilder() {
+            if (builder == null) {
+                try {
+                    Class<CompositeBuilder> builderClass = (Class<CompositeBuilder>)builderDeclaration.loadClass();
+                    try {
+                        Constructor<CompositeBuilder> constructor =
+                            builderClass.getConstructor(FactoryExtensionPoint.class, InterfaceContractMapper.class);
+                        builder = constructor.newInstance(factories, mapper);
+                    } catch (NoSuchMethodException e) {
+                        try {
+                            Constructor<CompositeBuilder> constructor =
+                                builderClass.getConstructor(BuilderExtensionPoint.class,
+                                                            FactoryExtensionPoint.class,
+                                                            InterfaceContractMapper.class);
+                            builder = constructor.newInstance(builders, factories, mapper);
+                        } catch (NoSuchMethodException ex) {
+                            Constructor<CompositeBuilder> constructor =
+                                builderClass.getConstructor(ExtensionPointRegistry.class);
+                            builder = constructor.newInstance(registry);
+                        }
+                    }
+                } catch (Exception e) {
+                    throw new IllegalStateException(e);
+                }
+            }
+            return builder;
+        }
+
+    }
+
+    private class LazyBindingBuilder implements BindingBuilder {
+        private ServiceDeclaration sd;
+        private BindingBuilder<?> builder;
+        private QName qname;;
+
+        /**
+         * @param sd
+         */
+        public LazyBindingBuilder(ServiceDeclaration sd) {
+            super();
+            this.sd = sd;
+            this.qname = ServiceDeclarationParser.getQName(sd.getAttributes().get("qname"));
+        }
+
+        public void build(Component component, Contract contract, Binding binding, BuilderContext context) {
+            getBuilder().build(component, contract, binding, context);
+        }
+
+        public QName getBindingType() {
+            return qname;
+        }
+
+
+        private synchronized BindingBuilder getBuilder() {
+            if (builder == null) {
+                try {
+                    Class<?> builderClass = sd.loadClass();
+                    try {
+                        Constructor<?> constructor = builderClass.getConstructor(ExtensionPointRegistry.class);
+                        builder = (BindingBuilder)constructor.newInstance(registry);
+                    } catch (NoSuchMethodException e) {
+                        Constructor<?> constructor = builderClass.getConstructor();
+                        builder = (BindingBuilder)constructor.newInstance();
+
+                    }
+                } catch (Exception e) {
+                    throw new IllegalStateException(e);
+                }
+            }
+            return builder;
+        }
+
+    }
+
+    private class LazyImplementationBuilder implements ImplementationBuilder {
+        private ServiceDeclaration sd;
+        private ImplementationBuilder<?> builder;
+        private QName qname;;
+
+        /**
+         * @param sd
+         */
+        public LazyImplementationBuilder(ServiceDeclaration sd) {
+            super();
+            this.sd = sd;
+            this.qname = ServiceDeclarationParser.getQName(sd.getAttributes().get("qname"));
+        }
+
+        public void build(Component component, Implementation implementation, BuilderContext context) {
+            getBuilder().build(component, implementation, context);
+        }
+
+        public QName getImplementationType() {
+            return qname;
+        }
+
+        private synchronized ImplementationBuilder getBuilder() {
+            if (builder == null) {
+                try {
+                    Class<?> builderClass = sd.loadClass();
+                    try {
+                        Constructor<?> constructor = builderClass.getConstructor(ExtensionPointRegistry.class);
+                        builder = (ImplementationBuilder)constructor.newInstance(registry);
+                    } catch (NoSuchMethodException e) {
+                        Constructor<?> constructor = builderClass.getConstructor();
+                        builder = (ImplementationBuilder)constructor.newInstance();
+
+                    }
+                } catch (Exception e) {
+                    throw new IllegalStateException(e);
+                }
+            }
+            return builder;
+        }
+
+    }
+
+    private class LazyPolicyBuilder implements PolicyBuilder {
+        private ServiceDeclaration sd;
+        private PolicyBuilder<?> builder;
+        private QName qname;;
+
+        /**
+         * @param sd
+         */
+        public LazyPolicyBuilder(ServiceDeclaration sd) {
+            super();
+            this.sd = sd;
+            this.qname = ServiceDeclarationParser.getQName(sd.getAttributes().get("qname"));
+        }
+
+        public void build(Component component, Implementation implementation, BuilderContext context) {
+            getBuilder().build(component, implementation, context);
+        }
+
+        public QName getPolicyType() {
+            return qname;
+        }
+        
+        private synchronized PolicyBuilder getBuilder() {
+            if (builder == null) {
+                try {
+                    Class<?> builderClass = sd.loadClass();
+                    try {
+                        Constructor<?> constructor = builderClass.getConstructor(ExtensionPointRegistry.class);
+                        builder = (PolicyBuilder)constructor.newInstance(registry);
+                    } catch (NoSuchMethodException e) {
+                        Constructor<?> constructor = builderClass.getConstructor();
+                        builder = (PolicyBuilder)constructor.newInstance();
+
+                    }
+                } catch (Exception e) {
+                    throw new IllegalStateException(e);
+                }
+            }
+            return builder;
+        }
+
+        public void build(Endpoint endpoint, BuilderContext context) {
+            getBuilder().build(endpoint, context);
+        }
+
+        public void build(org.apache.tuscany.sca.assembly.EndpointReference endpointReference, BuilderContext context) {
+            getBuilder().build(endpointReference, context);
+        }
+
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/DomainBuilder.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/DomainBuilder.java
new file mode 100644
index 0000000000..6fa2d18037
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/DomainBuilder.java
@@ -0,0 +1,83 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.assembly.builder;
+
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.Composite;
+import org.apache.tuscany.sca.assembly.Service;
+
+/**
+ * A builder that handles the configuration of the components inside a
+ * composite and the wiring of component references to component services.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface DomainBuilder {
+
+    /**
+     * Wire up the references and service in a domain returning a list
+     * of the composites that have changed
+     * 
+     * @param domainLevelCompsite
+     * @return a list of change composites
+     * @throws CompositeBuilderException
+     */
+    List<Composite> wireDomain(Composite domainLevelComposite);
+
+    /**
+     * Locates the referenced service and updates the URI on the identified binding
+     * 
+     * @param domainLevelComposite
+     * @param referenceName
+     * @param bindingClassName
+     * @param URI
+     */
+    void updateDomainLevelServiceURI(Composite domainLevelComposite,
+                                     String referenceName,
+                                     String bindingClassName,
+                                     String URI);
+
+    /**
+     * Get the component name out of the reference name that might look like Component/Service
+     * 
+     * @param referenceName
+     * @return
+     */
+    String getComponentNameFromReference(String referenceName);
+
+    /**
+     * Get the service name out of the reference name that might look like Component/Service
+     * 
+     * @param referenceName
+     * @return
+     */
+    String getServiceNameFromReference(String referenceName);
+
+    /**
+     * Find the service object given a reference name
+     * 
+     * @param composite
+     * @param referenceName
+     * @return
+     */
+    Service findServiceForReference(Composite composite, String referenceName);
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/ImplementationBuilder.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/ImplementationBuilder.java
new file mode 100644
index 0000000000..b1e22e195d
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/ImplementationBuilder.java
@@ -0,0 +1,49 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.assembly.builder;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.assembly.Component;
+import org.apache.tuscany.sca.assembly.Implementation;
+
+/**
+ * A builder that handles any build-time configuration needed by implementations.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface ImplementationBuilder<I extends Implementation> {
+
+    /**
+     * Configure a component implementation.
+     * 
+     * @param component The component 
+     * @param context TODO
+     * @param contract The implementation
+     */
+    void build(Component component, I implmentation, BuilderContext context);
+
+    /**
+     * Get the QName of the implementation type
+     * @return
+     */
+    QName getImplementationType();
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/Messages.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/Messages.java
new file mode 100644
index 0000000000..d40d72ae98
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/Messages.java
@@ -0,0 +1,30 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.assembly.builder;
+
+/**
+ * Constants for resource bundle names
+ */
+public interface Messages {
+    String RESOURCE_PACKAGE = "org.apache.tuscany.sca.assembly.builder.";
+    String ASSEMBLY_VALIDATION = RESOURCE_PACKAGE + "assembly-validation-messages";
+    String ASSEMBLY_CONFORMANCE = RESOURCE_PACKAGE + "assembly-conformance-messages";
+    String DEFINITIONS_VALIDATION = RESOURCE_PACKAGE + "definitions-validation-messages";
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/PolicyBuilder.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/PolicyBuilder.java
new file mode 100644
index 0000000000..2df42c2c23
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/PolicyBuilder.java
@@ -0,0 +1,57 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.assembly.builder;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.assembly.Component;
+import org.apache.tuscany.sca.assembly.Endpoint;
+import org.apache.tuscany.sca.assembly.EndpointReference;
+import org.apache.tuscany.sca.assembly.Implementation;
+
+/**
+ * A builder that is contributed by a specific policy languange to validate the configurations
+ * for SCA endpoints, endpoint references and component implementations
+ */
+public interface PolicyBuilder<T> {
+    QName getPolicyType();
+
+    /**
+     * Build (and validate) the policy settings on the endpoint
+     * @param endpoint
+     * @param monitor
+     */
+    void build(Endpoint endpoint, BuilderContext context);
+
+    /**
+     * Build (and validate) the policy settings on the endpoint reference
+     * @param endpointReference
+     * @param monitor
+     */
+    void build(EndpointReference endpointReference, BuilderContext context);
+
+    /**
+     * Build (and validate) the policy settings on the component implementation
+     * @param component
+     * @param implementation
+     * @param monitor
+     */
+    void build(Component component, Implementation implementation, BuilderContext context);
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/AbstractPropertyImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/AbstractPropertyImpl.java
new file mode 100644
index 0000000000..49995f5ab8
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/AbstractPropertyImpl.java
@@ -0,0 +1,93 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.assembly.impl;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.assembly.AbstractProperty;
+
+/**
+ * Represents an abstract property.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class AbstractPropertyImpl extends ExtensibleImpl implements AbstractProperty {
+    private Object value;
+    private String name;
+    private QName xsdType;
+    private QName xsdElement;
+    private boolean many;
+    private boolean mustSupply;
+
+    /**
+     * Constructs a new abstract property.
+     */
+    protected AbstractPropertyImpl() {
+    }
+
+    public Object getValue() {
+        return value;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public QName getXSDElement() {
+        return xsdElement;
+    }
+
+    public QName getXSDType() {
+        return xsdType;
+    }
+
+    public boolean isMany() {
+        return many;
+    }
+
+    public boolean isMustSupply() {
+        return mustSupply;
+    }
+
+    public void setValue(Object defaultValue) {
+        this.value = defaultValue;
+    }
+
+    public void setMany(boolean many) {
+        this.many = many;
+    }
+
+    public void setMustSupply(boolean mustSupply) {
+        this.mustSupply = mustSupply;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public void setXSDElement(QName element) {
+        this.xsdElement = element;
+    }
+
+    public void setXSDType(QName type) {
+        this.xsdType = type;
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/AbstractReferenceImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/AbstractReferenceImpl.java
new file mode 100644
index 0000000000..3e44f5f7ae
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/AbstractReferenceImpl.java
@@ -0,0 +1,46 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly.impl;
+
+import org.apache.tuscany.sca.assembly.AbstractReference;
+import org.apache.tuscany.sca.assembly.Multiplicity;
+
+/**
+ * Represents an abstract reference
+ * 
+ * @version $Rev$ $Date$
+ */
+public class AbstractReferenceImpl extends ContractImpl implements AbstractReference {
+    private Multiplicity multiplicity = Multiplicity.ONE_ONE;
+
+    /**
+     * Constructs a new abstract reference.
+     */
+    protected AbstractReferenceImpl() {
+    }
+
+    public Multiplicity getMultiplicity() {
+        return multiplicity;
+    }
+
+    public void setMultiplicity(Multiplicity multiplicity) {
+        this.multiplicity = multiplicity;
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/AbstractServiceImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/AbstractServiceImpl.java
new file mode 100644
index 0000000000..24b1a0e03e
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/AbstractServiceImpl.java
@@ -0,0 +1,36 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly.impl;
+
+import org.apache.tuscany.sca.assembly.AbstractService;
+
+/**
+ * Represents an abstract service
+ * 
+ * @version $Rev$ $Date$
+ */
+public class AbstractServiceImpl extends ContractImpl implements AbstractService {
+
+    /**
+     * Constructs a new abstract service.
+     */
+    protected AbstractServiceImpl() {
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/AssemblyFactoryImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/AssemblyFactoryImpl.java
new file mode 100644
index 0000000000..0759ff1361
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/AssemblyFactoryImpl.java
@@ -0,0 +1,138 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.tuscany.sca.assembly.impl;
+
+import org.apache.tuscany.sca.assembly.AbstractProperty;
+import org.apache.tuscany.sca.assembly.AbstractReference;
+import org.apache.tuscany.sca.assembly.AbstractService;
+import org.apache.tuscany.sca.assembly.AssemblyFactory;
+import org.apache.tuscany.sca.assembly.Callback;
+import org.apache.tuscany.sca.assembly.Component;
+import org.apache.tuscany.sca.assembly.ComponentProperty;
+import org.apache.tuscany.sca.assembly.ComponentReference;
+import org.apache.tuscany.sca.assembly.ComponentService;
+import org.apache.tuscany.sca.assembly.ComponentType;
+import org.apache.tuscany.sca.assembly.Composite;
+import org.apache.tuscany.sca.assembly.CompositeReference;
+import org.apache.tuscany.sca.assembly.CompositeService;
+import org.apache.tuscany.sca.assembly.ConfiguredOperation;
+import org.apache.tuscany.sca.assembly.Endpoint;
+import org.apache.tuscany.sca.assembly.EndpointReference;
+import org.apache.tuscany.sca.assembly.Extension;
+import org.apache.tuscany.sca.assembly.Property;
+import org.apache.tuscany.sca.assembly.Reference;
+import org.apache.tuscany.sca.assembly.Service;
+import org.apache.tuscany.sca.assembly.Wire;
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+
+/**
+ * A factory for the assembly model.
+ *
+ * @version $Rev$ $Date$
+ */
+public abstract class AssemblyFactoryImpl implements AssemblyFactory {
+
+    protected ExtensionPointRegistry registry;
+
+    protected AssemblyFactoryImpl(ExtensionPointRegistry registry) {
+        super();
+        this.registry = registry;
+    }
+
+    public AbstractProperty createAbstractProperty() {
+        return new AbstractPropertyImpl();
+    }
+
+    public AbstractReference createAbstractReference() {
+        return new AbstractReferenceImpl();
+    }
+
+    public AbstractService createAbstractService() {
+        return new AbstractServiceImpl();
+    }
+
+    public Callback createCallback() {
+        return new CallbackImpl();
+    }
+
+    public Component createComponent() {
+        return new ComponentImpl();
+    }
+
+    public ComponentProperty createComponentProperty() {
+        return new ComponentPropertyImpl();
+    }
+
+    public ComponentReference createComponentReference() {
+        return new ComponentReferenceImpl();
+    }
+
+    public ComponentService createComponentService() {
+        return new ComponentServiceImpl();
+    }
+
+    public ComponentType createComponentType() {
+        return new ComponentTypeImpl();
+    }
+
+    public Composite createComposite() {
+        return new CompositeImpl();
+    }
+
+    public CompositeReference createCompositeReference() {
+        return new CompositeReferenceImpl();
+    }
+
+    public CompositeService createCompositeService() {
+        return new CompositeServiceImpl();
+    }
+
+    public Property createProperty() {
+        return new PropertyImpl();
+    }
+
+    public Reference createReference() {
+        return new ReferenceImpl();
+    }
+
+    public Service createService() {
+        return new ServiceImpl();
+    }
+
+    public Wire createWire() {
+        return new WireImpl();
+    }
+
+    public Extension createExtension() {
+        return new ExtensionImpl();
+    }
+
+    public Endpoint createEndpoint() {
+        return new EndpointImpl(registry);
+    }
+
+    public EndpointReference createEndpointReference() {
+        return new EndpointReferenceImpl(registry);
+    }
+
+    public ConfiguredOperation createConfiguredOperation() {
+        return new ConfiguredOperationImpl();
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/BaseImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/BaseImpl.java
new file mode 100644
index 0000000000..516b11724f
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/BaseImpl.java
@@ -0,0 +1,45 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly.impl;
+
+import org.apache.tuscany.sca.assembly.Base;
+
+/**
+ * Convenience base class for assembly model objects.
+ * 
+ * @version $Rev$ $Date$
+ */
+public abstract class BaseImpl implements Base {
+    private boolean unresolved;
+
+    /**
+     * Constructs a new base model object.
+     */
+    protected BaseImpl() {
+    }
+
+    public boolean isUnresolved() {
+        return unresolved;
+    }
+
+    public void setUnresolved(boolean undefined) {
+        this.unresolved = undefined;
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/BindingImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/BindingImpl.java
new file mode 100644
index 0000000000..552d67fec6
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/BindingImpl.java
@@ -0,0 +1,99 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.tuscany.sca.assembly.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.assembly.Binding;
+import org.apache.tuscany.sca.policy.ExtensionType;
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.PolicySet;
+
+/**
+ * Base Binding implementation class
+ */
+public abstract class BindingImpl extends ExtensibleImpl implements Binding {
+    private String name;
+    private ExtensionType extensionType;
+    private String uri;
+    private List<Intent> requiredIntents = new ArrayList<Intent>();
+    private List<PolicySet> policySets = new ArrayList<PolicySet>();
+
+    protected QName type;
+
+    protected BindingImpl(QName type) {
+        super();
+        this.type = type;
+    }
+
+    public QName getType() {
+        return type;
+    }
+
+    public List<Intent> getRequiredIntents() {
+        return requiredIntents;
+    }
+
+    public List<PolicySet> getPolicySets() {
+        return policySets;
+    }
+
+    @Override
+    public Object clone() throws CloneNotSupportedException {
+        return super.clone();
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public ExtensionType getExtensionType() {
+        return extensionType;
+    }
+
+    public void setExtensionType(ExtensionType type) {
+        this.extensionType = type;
+    }
+
+    public String getURI() {
+        return uri;
+    }
+
+    public void setURI(String uri) {
+        this.uri = uri;
+    }
+    
+    public String toString() {
+        StringBuffer buf = new StringBuffer();
+        buf.append(getType()).append(" (");
+        buf.append("uri=").append(getURI());
+        buf.append(",name=").append(getName());
+        buf.append(")");
+        return buf.toString();
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/CallbackImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/CallbackImpl.java
new file mode 100644
index 0000000000..dcd6c7b08a
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/CallbackImpl.java
@@ -0,0 +1,67 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.assembly.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.Binding;
+import org.apache.tuscany.sca.assembly.Callback;
+import org.apache.tuscany.sca.policy.ExtensionType;
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.PolicySet;
+
+/**
+ * Represents a reference.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class CallbackImpl extends ExtensibleImpl implements Callback {
+    private List<Binding> bindings = new ArrayList<Binding>();
+    private List<Intent> requiredIntents = new ArrayList<Intent>();
+    private List<PolicySet> policySets = new ArrayList<PolicySet>();
+
+    public List<PolicySet> getPolicySets() {
+        return policySets;
+    }
+
+    public List<Intent> getRequiredIntents() {
+        return requiredIntents;
+    }
+
+    protected CallbackImpl() {
+    }
+
+    public List<Binding> getBindings() {
+        return bindings;
+    }
+
+    public ExtensionType getExtensionType() {
+        return null;
+    }
+
+    public void setExtensionType(ExtensionType type) {
+    }
+
+    public void setRequiredIntents(List<Intent> intents) {
+        this.requiredIntents = intents;
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ComponentImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ComponentImpl.java
new file mode 100644
index 0000000000..8a03df339c
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ComponentImpl.java
@@ -0,0 +1,186 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.Component;
+import org.apache.tuscany.sca.assembly.ComponentProperty;
+import org.apache.tuscany.sca.assembly.ComponentReference;
+import org.apache.tuscany.sca.assembly.ComponentService;
+import org.apache.tuscany.sca.assembly.Composite;
+import org.apache.tuscany.sca.assembly.Implementation;
+import org.apache.tuscany.sca.policy.ExtensionType;
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.PolicySet;
+
+/**
+ * Represents a component.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class ComponentImpl extends ExtensibleImpl implements Component, Cloneable {
+    private Implementation implementation;
+    private String name;
+    private String uri;
+    private List<ComponentProperty> properties = new ArrayList<ComponentProperty>();
+    private List<ComponentReference> references = new ArrayList<ComponentReference>();
+    private List<ComponentService> services = new ArrayList<ComponentService>();
+    private List<Intent> requiredIntents = new ArrayList<Intent>();
+    private List<PolicySet> policySets = new ArrayList<PolicySet>();
+    private Boolean autowire;
+    private ExtensionType type;
+
+    /**
+     * Constructs a new component.
+     */
+    protected ComponentImpl() {
+    }
+
+    @Override
+    public Object clone() throws CloneNotSupportedException {
+        ComponentImpl clone = (ComponentImpl)super.clone();
+
+        clone.properties = new ArrayList<ComponentProperty>();
+        for (ComponentProperty property : getProperties()) {
+            clone.properties.add((ComponentProperty)property.clone());
+        }
+        clone.references = new ArrayList<ComponentReference>();
+        for (ComponentReference reference : getReferences()) {
+            clone.references.add((ComponentReference)reference.clone());
+        }
+        clone.services = new ArrayList<ComponentService>();
+        for (ComponentService service : getServices()) {
+            clone.services.add((ComponentService)service.clone());
+        }
+        
+        // Clone the implementation.composite
+        if(implementation instanceof Composite) {
+            clone.implementation = (Composite) ((Composite) implementation).clone();
+        }
+        
+        // Clone the Lists for intents and policySets
+        clone.requiredIntents = new ArrayList<Intent>(getRequiredIntents());
+        clone.policySets = new ArrayList<PolicySet>(getPolicySets());
+        
+        return clone;
+    }
+
+    public String getURI() {
+        return uri;
+    }
+
+    public void setURI(String uri) {
+        this.uri = uri;
+    }
+
+    public Implementation getImplementation() {
+        return implementation;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public List<ComponentProperty> getProperties() {
+        return properties;
+    }
+    
+    public ComponentProperty getProperty(String name) {
+        for (ComponentProperty property : getProperties()) {
+            if (property.getName().equals(name)) {
+                return property;
+            }
+        }
+        return null;
+    }
+
+    public List<ComponentReference> getReferences() {
+        return references;
+    }
+    
+    public ComponentReference getReference(String name){
+        for (ComponentReference ref : getReferences()){
+            if (ref.getName().equals(name)){
+                return ref;
+            }
+        }
+        return null;
+    }      
+
+    public List<ComponentService> getServices() {
+        return services;
+    }
+    
+    public ComponentService getService(String name) {
+        for (ComponentService service : getServices()) {
+            if (service.getName().equals(name)) {
+                return service;
+            }
+        }
+        return null;
+    }
+
+    public void setImplementation(Implementation implementation) {
+        this.implementation = implementation;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public List<Intent> getRequiredIntents() {
+        return requiredIntents;
+    }
+
+    public List<PolicySet> getPolicySets() {
+        return policySets;
+    }
+
+    public boolean isAutowire() {
+        return (autowire == null) ? false : autowire.booleanValue();
+    }
+
+    public void setAutowire(Boolean autowire) {
+        this.autowire = autowire;
+    }
+
+    public Boolean getAutowire() {
+        return autowire;
+    }
+
+    public ExtensionType getExtensionType() {
+        return type;
+    }
+
+    public void setExtensionType(ExtensionType type) {
+        this.type = type;
+    }
+    
+    public String toString() {
+        StringBuffer buf = new StringBuffer("Component (");
+        buf.append("uri=").append(uri);
+        buf.append(",name=").append(name);
+        buf.append(",implementation=").append(implementation);
+        buf.append(")");
+        return buf.toString();
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ComponentPropertyImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ComponentPropertyImpl.java
new file mode 100644
index 0000000000..9db522930f
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ComponentPropertyImpl.java
@@ -0,0 +1,97 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.assembly.impl;
+
+import javax.xml.xpath.XPathExpression;
+
+import org.apache.tuscany.sca.assembly.ComponentProperty;
+import org.apache.tuscany.sca.assembly.Property;
+
+/**
+ * Represents a component property.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class ComponentPropertyImpl extends PropertyImpl implements ComponentProperty, Cloneable {
+    private String file;
+    private Property property;
+    private String source;
+    private XPathExpression sourceXPathExpression;
+
+    /**
+     * Constructs a new component property.
+     */
+    protected ComponentPropertyImpl() {
+    }
+
+    @Override
+    public Object clone() throws CloneNotSupportedException {
+        return super.clone();
+    }
+
+    // FIXME getValue should not delegate to property.getValue()
+    // Doing this violates the setValue/getValue semantics, as you
+    // can call setValue() then get a different value from getValue()
+    @Override
+    public Object getValue() {
+        if (super.getValue() == null && property != null) {
+            return property.getValue();
+        } else {
+            return super.getValue();
+        }
+    }
+
+    public String getFile() {
+        return file;
+    }
+
+    public Property getProperty() {
+        return property;
+    }
+
+    public String getSource() {
+        return source;
+    }
+
+    public void setFile(String file) {
+        this.file = file;
+    }
+
+    public void setProperty(Property property) {
+        this.property = property;
+    }
+
+    public void setSource(String source) {
+        this.source = source;
+    }
+
+    public XPathExpression getSourceXPathExpression() {
+        return sourceXPathExpression;
+    }
+
+    public void setSourceXPathExpression(XPathExpression sourceXPathExpression) {
+        this.sourceXPathExpression = sourceXPathExpression;
+    }
+    
+    public String toString() {
+    	return "Property: " + getName() + " Value: " + getValue();
+    } // end method toString
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ComponentReferenceImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ComponentReferenceImpl.java
new file mode 100644
index 0000000000..78b54668b3
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ComponentReferenceImpl.java
@@ -0,0 +1,119 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.assembly.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.Binding;
+import org.apache.tuscany.sca.assembly.ComponentReference;
+import org.apache.tuscany.sca.assembly.ComponentService;
+import org.apache.tuscany.sca.assembly.CompositeReference;
+import org.apache.tuscany.sca.assembly.Reference;
+import org.apache.tuscany.sca.interfacedef.InterfaceContract;
+
+/**
+ * Represents a component reference
+ * 
+ * @version $Rev$ $Date$
+ */
+public class ComponentReferenceImpl extends ReferenceImpl implements ComponentReference, Cloneable {
+    private Reference reference;
+    private Boolean autowire;
+    private boolean nonOverridable;
+    private List<CompositeReference> promotedAs = new ArrayList<CompositeReference>();
+    private ComponentService callbackService;
+    private boolean isPromoted = false;
+
+    /**
+     * Constructs a new component reference.
+     */
+    protected ComponentReferenceImpl() {
+        // Set multiplicity to null so that by default it'll inherit from the Reference
+        setMultiplicity(null);
+    }
+
+    @Override
+    public Object clone() throws CloneNotSupportedException {
+        return super.clone();
+    }
+
+    public Reference getReference() {
+        return reference;
+    }
+
+    public void setReference(Reference reference) {
+        this.reference = reference;
+    }
+
+    public boolean isAutowire() {
+        return (autowire == null) ? false : autowire.booleanValue();
+    }
+
+    public void setAutowire(Boolean autowire) {
+        this.autowire = autowire;
+    }
+
+    public Boolean getAutowire() {
+        return autowire;
+    }
+
+    public List<CompositeReference> promotedAs() {
+        return promotedAs;
+    }
+
+    public ComponentService getCallbackService() {
+        return callbackService;
+    }
+
+    public void setCallbackService(ComponentService callbackService) {
+        this.callbackService = callbackService;
+    }
+
+    /**
+     * Use endpoint information to work out what the interface contract for the
+     * binding is. 
+     */
+    @Override
+    public InterfaceContract getInterfaceContract(Binding binding) {
+        InterfaceContract interfaceContract = null;
+
+        if (interfaceContract == null) {
+            interfaceContract = getInterfaceContract();
+        }
+        return interfaceContract;
+    }
+
+    public boolean isNonOverridable() {
+        return nonOverridable;
+    }
+
+    public void setNonOverridable(boolean nonOverridable) {
+        this.nonOverridable = nonOverridable;
+    }
+
+    public void setPromoted(boolean isPromoted) {
+        this.isPromoted = isPromoted;
+    } // end method setPromoted
+
+    public boolean isPromoted() {
+        return isPromoted;
+    }
+} // end class ComponentReferenceImpl
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ComponentServiceImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ComponentServiceImpl.java
new file mode 100644
index 0000000000..f8c9f53413
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ComponentServiceImpl.java
@@ -0,0 +1,71 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.assembly.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.ComponentReference;
+import org.apache.tuscany.sca.assembly.ComponentService;
+import org.apache.tuscany.sca.assembly.CompositeService;
+import org.apache.tuscany.sca.assembly.Service;
+
+/**
+ * Represents a component service
+ * 
+ * @version $Rev$ $Date$
+ */
+public class ComponentServiceImpl extends ServiceImpl implements ComponentService, Cloneable {
+    private Service service;
+    private List<CompositeService> promotedAs = new ArrayList<CompositeService>();
+    private ComponentReference callbackReference;
+
+    /**
+     * Constructs a new component service.
+     */
+    protected ComponentServiceImpl() {
+    }
+
+    @Override
+    public Object clone() throws CloneNotSupportedException {
+        return super.clone();
+    }
+
+    public Service getService() {
+        return service;
+    }
+
+    public void setService(Service service) {
+        this.service = service;
+    }
+
+    public List<CompositeService> promotedAs() {
+        return promotedAs;
+    }
+
+    public ComponentReference getCallbackReference() {
+        return callbackReference;
+    }
+
+    public void setCallbackReference(ComponentReference callbackReference) {
+        this.callbackReference = callbackReference;
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ComponentTypeImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ComponentTypeImpl.java
new file mode 100644
index 0000000000..f18c852e69
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ComponentTypeImpl.java
@@ -0,0 +1,167 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.ComponentType;
+import org.apache.tuscany.sca.assembly.Property;
+import org.apache.tuscany.sca.assembly.Reference;
+import org.apache.tuscany.sca.assembly.Service;
+import org.apache.tuscany.sca.policy.ExtensionType;
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.PolicySet;
+
+/** 
+ * Represents a component type.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class ComponentTypeImpl extends ExtensibleImpl implements ComponentType, Cloneable {
+    private String uri;
+    private List<Property> properties = new ArrayList<Property>();
+    private List<Reference> references = new ArrayList<Reference>();
+    private List<Service> services = new ArrayList<Service>();
+    private List<Intent> requiredIntents = new ArrayList<Intent>();
+    private List<PolicySet> policySets = new ArrayList<PolicySet>();
+
+    /**
+     * Constructs a new component type.
+     */
+    protected ComponentTypeImpl() {
+    }
+
+    @Override
+    public Object clone() throws CloneNotSupportedException {
+        ComponentTypeImpl clone = (ComponentTypeImpl)super.clone();
+
+        clone.services = new ArrayList<Service>();
+        for (Service service : getServices()) {
+            clone.services.add((Service)service.clone());
+        }
+        clone.references = new ArrayList<Reference>();
+        for (Reference reference : getReferences()) {
+            clone.references.add((Reference)reference.clone());
+        }
+        clone.properties = new ArrayList<Property>();
+        for (Property property : getProperties()) {
+            clone.properties.add((Property)property.clone());
+        }
+        clone.requiredIntents = new ArrayList<Intent>(requiredIntents);
+        clone.policySets = new ArrayList<PolicySet>(policySets);
+        return clone;
+    }
+
+    public String getURI() {
+        return uri;
+    }
+
+    public void setURI(String uri) {
+        this.uri = uri;
+    }
+
+    public List<Property> getProperties() {
+        return properties;
+    }
+    
+    public Property getProperty(String name){
+        Property property = null;
+        
+        for (Property tmp : getProperties()){
+            if (tmp.getName().equals(name)){
+                property = tmp;
+                break;
+            }
+        }
+        
+        return property;
+    }
+
+    public List<Reference> getReferences() {
+        return references;
+    }
+    
+    public Reference getReference(String name){
+        Reference reference = null;
+        
+        for (Reference tmp : getReferences()){
+            if (tmp.getName().equals(name)){
+                reference = tmp;
+                break;
+            }
+        }
+        
+        return reference;
+    }    
+
+    public List<Service> getServices() {
+        return services;
+    }
+    
+    public Service getService(String name){
+        Service service = null;
+        
+        for (Service tmp : getServices()){
+            if (tmp.getName().equals(name)){
+                service = tmp;
+                break;
+            }
+        }
+        
+        return service;
+    }  
+
+    @Override
+    public int hashCode() {
+        return String.valueOf(getURI()).hashCode();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        } else {
+            if (obj instanceof ComponentType) {
+                if (getURI() != null) {
+                    return getURI().equals(((ComponentType)obj).getURI());
+                } else {
+                    return ((ComponentType)obj).getURI() == null;
+                }
+            } else {
+                return false;
+            }
+        }
+    }
+
+    public List<Intent> getRequiredIntents() {
+        return requiredIntents;
+    }
+
+    public List<PolicySet> getPolicySets() {
+        return policySets;
+    }
+
+    public ExtensionType getExtensionType() {
+        return null;
+    }
+
+    public void setExtensionType(ExtensionType type) {
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/CompositeImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/CompositeImpl.java
new file mode 100644
index 0000000000..fba6af7e7f
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/CompositeImpl.java
@@ -0,0 +1,185 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.tuscany.sca.assembly.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.assembly.Component;
+import org.apache.tuscany.sca.assembly.ComponentReference;
+import org.apache.tuscany.sca.assembly.Composite;
+import org.apache.tuscany.sca.assembly.CompositeReference;
+import org.apache.tuscany.sca.assembly.CompositeService;
+import org.apache.tuscany.sca.assembly.Reference;
+import org.apache.tuscany.sca.assembly.Service;
+import org.apache.tuscany.sca.assembly.Wire;
+
+/**
+ * Implementation of a Composite.
+ *
+ * @version $Rev$ $Date$
+ */
+public class CompositeImpl extends ImplementationImpl implements Composite, Cloneable {
+    private String specVersion = "undefined";
+    private List<Component> components = new ArrayList<Component>();
+    private List<Composite> includes = new ArrayList<Composite>();
+    private QName name;
+    private List<Wire> wires = new ArrayList<Wire>();
+    private Boolean autowire;
+    private boolean local = true;
+
+    /**
+     * Constructs a new composite.
+     */
+    protected CompositeImpl() {
+        super(TYPE);
+    }
+
+    @Override
+    public Object clone() throws CloneNotSupportedException {
+        CompositeImpl clone = (CompositeImpl)super.clone();
+
+        // clone the child components
+        clone.components = new ArrayList<Component>();
+        for (Component component : getComponents()) {
+            Component clonedComponent = (Component)component.clone();
+            clone.components.add(clonedComponent);
+        }
+        
+        // reset the references and services so the get re-resolved
+        for (Service service : clone.getServices()) {
+            CompositeService compositeService = (CompositeService)service;
+            // Force the promoted component/service to be rebuilt against the clone
+            if (compositeService.getPromotedComponent() != null) {
+                compositeService.getPromotedComponent().setUnresolved(true);
+            }
+            if (compositeService.getPromotedService() != null) {
+                compositeService.getPromotedService().setUnresolved(true);
+            }
+        }
+        for (Reference reference : clone.getReferences()) {
+            CompositeReference compositeReference = (CompositeReference)reference;
+            for (ComponentReference ref : compositeReference.getPromotedReferences()) {
+                // Force the promoted reference to be rebuilt against the clone
+                ref.setUnresolved(true);
+            }
+        }
+        
+        // clone the wires
+        clone.wires = new ArrayList<Wire>();
+        for (Wire wire : getWires()) {
+            clone.wires.add((Wire)wire.clone());
+        }
+        
+        // Clone the includes 
+        clone.includes = new ArrayList<Composite>();
+        for (Composite included : getIncludes()) {
+            clone.includes.add((Composite)included.clone());
+        }
+        return clone;
+    }
+
+    public String getSpecVersion() {
+        return specVersion;
+    }
+
+    public void setSpecVersion(String specVersion) {
+        this.specVersion = specVersion;
+    }
+
+    public List<Component> getComponents() {
+        return components;
+    }
+    
+    public Component getComponent(String name) {
+        Component component = null;
+        
+        for (Component tmp : getComponents()){
+            if (tmp.getName().equals(name)){
+                component = tmp;
+                break;
+            }
+        }
+        return component;
+    }
+
+    public List<Composite> getIncludes() {
+        return includes;
+    }
+
+    public QName getName() {
+        return name;
+    }
+
+    public List<Wire> getWires() {
+        return wires;
+    }
+
+    public boolean isLocal() {
+        return local;
+    }
+
+    public void setLocal(boolean local) {
+        this.local = local;
+    }
+
+    public boolean isAutowire() {
+        return (autowire == null) ? false : autowire.booleanValue();
+    }
+
+    public void setAutowire(Boolean autowire) {
+        this.autowire = autowire;
+    }
+
+    public Boolean getAutowire() {
+        return autowire;
+    }
+
+    public void setName(QName name) {
+        this.name = name;
+    }
+
+    @Override
+    public int hashCode() {
+        return String.valueOf(getName()).hashCode();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        } else if (obj instanceof Composite) {
+            if (getName() != null) {
+                return getName().equals(((Composite)obj).getName());
+            } else {
+                return ((Composite)obj).getName() == null;
+            }
+        } else {
+            return false;
+        }
+    }
+
+    @Override
+    public String toString() {
+        return "Composite (name=" + getName() + ")";
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/CompositeReferenceImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/CompositeReferenceImpl.java
new file mode 100644
index 0000000000..ae5fad461b
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/CompositeReferenceImpl.java
@@ -0,0 +1,63 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.assembly.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.Component;
+import org.apache.tuscany.sca.assembly.ComponentReference;
+import org.apache.tuscany.sca.assembly.CompositeReference;
+
+/**
+ * Represents a composite reference.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class CompositeReferenceImpl extends ReferenceImpl implements CompositeReference, Cloneable {
+    private List<Component> promotedComponents = new ArrayList<Component>();
+    private List<ComponentReference> promotedReferences = new ArrayList<ComponentReference>();
+
+    /**
+     * Constructs a new composite reference.
+     */
+    protected CompositeReferenceImpl() {
+    }
+
+    @Override
+    public Object clone() throws CloneNotSupportedException {
+        CompositeReferenceImpl copy = (CompositeReferenceImpl)super.clone();
+        copy.promotedComponents = new ArrayList<Component>(promotedComponents);
+        copy.promotedReferences = new ArrayList<ComponentReference>(promotedReferences);
+        return copy;
+    }
+
+    public List<ComponentReference> getPromotedReferences() {
+        return promotedReferences;
+    }
+
+    public List<Component> getPromotedComponents() {
+        return promotedComponents;
+    }
+
+    public String toString() {
+        return getName();
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/CompositeServiceImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/CompositeServiceImpl.java
new file mode 100644
index 0000000000..55b48ec578
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/CompositeServiceImpl.java
@@ -0,0 +1,62 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.assembly.impl;
+
+import org.apache.tuscany.sca.assembly.Component;
+import org.apache.tuscany.sca.assembly.ComponentService;
+import org.apache.tuscany.sca.assembly.CompositeService;
+
+/**
+ * Represents a composite service
+ * 
+ * @version $Rev$ $Date$
+ */
+public class CompositeServiceImpl extends ServiceImpl implements CompositeService, Cloneable {
+    private ComponentService promotedService;
+    private Component promotedComponent;
+
+    /**
+     * Constructs a new composite service.
+     */
+    protected CompositeServiceImpl() {
+    }
+
+    @Override
+    public Object clone() throws CloneNotSupportedException {
+        return super.clone();
+    }
+
+    public ComponentService getPromotedService() {
+        return promotedService;
+    }
+
+    public void setPromotedService(ComponentService promotedService) {
+        this.promotedService = promotedService;
+    }
+
+    public Component getPromotedComponent() {
+        return promotedComponent;
+    }
+
+    public void setPromotedComponent(Component promotedComponent) {
+        this.promotedComponent = promotedComponent;
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ConfiguredOperationImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ConfiguredOperationImpl.java
new file mode 100644
index 0000000000..32377faf54
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ConfiguredOperationImpl.java
@@ -0,0 +1,95 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.assembly.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.ConfiguredOperation;
+import org.apache.tuscany.sca.policy.ExtensionType;
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.PolicySet;
+
+/**
+ * Represents an Operation.
+ *
+ * @version $Rev$ $Date$
+ */
+public class ConfiguredOperationImpl extends BaseImpl implements ConfiguredOperation {
+    private List<PolicySet> policySets = new ArrayList<PolicySet>();
+    private List<Intent> requiredIntents = new ArrayList<Intent>();
+    private List<PolicySet> applicablePolicySets = new ArrayList<PolicySet>();
+    
+    private String name;
+    private String contractName;
+    private ExtensionType type;
+
+    /**
+     * Constructs a new Operation.
+     */
+    protected ConfiguredOperationImpl() {
+    }
+    
+    public List<PolicySet> getPolicySets() {
+        return policySets;
+    }
+    
+    public void setPolicySets(List<PolicySet> policySets) {
+        this.policySets = policySets; 
+    }
+    
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+    
+    public List<Intent> getRequiredIntents() {
+        return requiredIntents;
+    }
+    
+    public void setRequiredIntents(List<Intent> intents) {
+        this.requiredIntents = intents;
+    }
+
+    public String getContractName() {
+        return contractName;
+    }
+
+    public void setContractName(String contractName) {
+        this.contractName = contractName;
+    }
+
+    public List<PolicySet> getApplicablePolicySets() {
+        return applicablePolicySets;
+    }
+
+    public ExtensionType getExtensionType() {
+        return type;
+    }
+
+    public void setExtensionType(ExtensionType type) {
+        this.type = type;
+    }
+    
+    
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ContractImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ContractImpl.java
new file mode 100644
index 0000000000..2b72f1f047
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ContractImpl.java
@@ -0,0 +1,88 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.AbstractContract;
+import org.apache.tuscany.sca.interfacedef.InterfaceContract;
+import org.apache.tuscany.sca.policy.ExtensionType;
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.PolicySet;
+
+/**
+ * Implementation of a Contract.
+ *
+ * @version $Rev$ $Date$
+ */
+public class ContractImpl extends ExtensibleImpl implements AbstractContract {
+    private InterfaceContract interfaceContract;
+    private String name;
+    private List<Intent> requiredIntents = new ArrayList<Intent>();
+    private List<PolicySet> policySets = new ArrayList<PolicySet>();
+
+    private boolean isCallback = false;
+
+    /**
+     * Constructs a new contract.
+     */
+    protected ContractImpl() {
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public InterfaceContract getInterfaceContract() {
+        return interfaceContract;
+    }
+
+    public void setInterfaceContract(InterfaceContract interfaceContract) {
+        this.interfaceContract = interfaceContract;
+    }
+
+    public List<Intent> getRequiredIntents() {
+        return requiredIntents;
+    }
+
+    public boolean isForCallback() {
+        return isCallback;
+    }
+
+    public void setForCallback(boolean isCallback) {
+        this.isCallback = isCallback;
+    }
+
+    public ExtensionType getExtensionType() {
+        return null;
+    }
+
+    public void setExtensionType(ExtensionType type) {
+    }
+
+    public List<PolicySet> getPolicySets() {
+        return policySets;
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/DistributedSCABindingImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/DistributedSCABindingImpl.java
new file mode 100644
index 0000000000..99d68a11bc
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/DistributedSCABindingImpl.java
@@ -0,0 +1,76 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.assembly.impl;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.assembly.DistributedSCABinding;
+import org.apache.tuscany.sca.assembly.SCABinding;
+
+/**
+ * The Distributed SCA binding wrapper for the SCA binding model object. This is currently
+ * just used to locate the remote binding extension and pass the SCA binding to the remote
+ * extension. It isn't used in the model itself
+ *
+ * @version $Rev$ $Date$
+ */
+public class DistributedSCABindingImpl implements DistributedSCABinding {
+
+    private SCABinding scaBinding;
+
+    public SCABinding getSCABinding() {
+        return scaBinding;
+    }
+
+    public void setSCABinding(SCABinding scaBinding) {
+        this.scaBinding = scaBinding;
+    }
+
+    public String getURI() {
+        return null;
+    }
+
+    public void setURI(String uri) {
+    }
+
+    public String getName() {
+        return null;
+    }
+
+    public void setName(String name) {
+
+    }
+
+    public boolean isUnresolved() {
+        return false;
+    }
+
+    public void setUnresolved(boolean unresolved) {
+
+    }
+
+    @Override
+    public Object clone() throws CloneNotSupportedException {
+        return super.clone();
+    }
+
+    public QName getType() {
+        return TYPE;
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/EndpointImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/EndpointImpl.java
new file mode 100644
index 0000000000..4b1d9e437d
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/EndpointImpl.java
@@ -0,0 +1,202 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.assembly.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.Binding;
+import org.apache.tuscany.sca.assembly.Component;
+import org.apache.tuscany.sca.assembly.ComponentService;
+import org.apache.tuscany.sca.assembly.Endpoint;
+import org.apache.tuscany.sca.assembly.EndpointReference;
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.interfacedef.InterfaceContract;
+import org.apache.tuscany.sca.policy.ExtensionType;
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.PolicySet;
+import org.apache.tuscany.sca.policy.PolicySubject;
+
+/**
+ * The assembly model object for an endpoint.
+ *
+ * @version $Rev$ $Date$
+ */
+public class EndpointImpl implements Endpoint {
+    private static final long serialVersionUID = 7344399683703812593L;
+
+    protected transient ExtensionPointRegistry registry;
+    protected boolean unresolved;
+    protected String uri;
+    protected Component component;
+    protected ComponentService service;
+    protected Binding binding;
+    protected InterfaceContract interfaceContract;
+    protected List<EndpointReference> callbackEndpointReferences = new ArrayList<EndpointReference>();
+    protected List<PolicySet> policySets = new ArrayList<PolicySet>();
+    protected List<Intent> requiredIntents = new ArrayList<Intent>();
+    protected boolean remote = false;
+
+    protected EndpointImpl(ExtensionPointRegistry registry) {
+        this.registry = registry;
+    }
+
+    @Override
+    public Object clone() throws CloneNotSupportedException {
+        return super.clone();
+    }
+
+    public boolean isUnresolved() {
+        return unresolved;
+    }
+
+    public void setUnresolved(boolean unresolved) {
+        this.unresolved = unresolved;
+    }
+
+    public Component getComponent() {
+        resolve();
+        return component;
+    }
+
+    public void setComponent(Component component) {
+        this.component = component;
+        reset();
+    }
+
+    public ComponentService getService() {
+        resolve();
+        return service;
+    }
+
+    public void setService(ComponentService service) {
+        this.service = service;
+        reset();
+    }
+
+    public Binding getBinding() {
+        resolve();
+        return binding;
+    }
+
+    public void setBinding(Binding binding) {
+        this.binding = binding;
+        reset();
+    }
+
+    public InterfaceContract getInterfaceContract() {
+        resolve();
+        return interfaceContract;
+    }
+
+    public void setInterfaceContract(InterfaceContract interfaceContract) {
+        this.interfaceContract = interfaceContract;
+    }
+
+    /**
+     * Get the services callbacl enpoint references that
+     * represent endpoint references from which callbacks
+     * originate
+     *
+     * @return callbackEndpoint the reference callback endpoint
+     */
+    public List<EndpointReference> getCallbackEndpointReferences() {
+        resolve();
+        return callbackEndpointReferences;
+    }
+
+    public List<PolicySet> getPolicySets() {
+        resolve();
+        return policySets;
+    }
+
+    public List<Intent> getRequiredIntents() {
+        resolve();
+        return requiredIntents;
+    }
+
+    public ExtensionType getExtensionType() {
+        if (binding instanceof PolicySubject) {
+            return ((PolicySubject)binding).getExtensionType();
+        }
+        return null;
+    }
+
+    public void setExtensionType(ExtensionType type) {
+        throw new UnsupportedOperationException();
+    }
+    
+    public String toStringWithoutHash() {
+        String output = "Endpoint: ";
+        
+        if (getURI() != null) {
+            output += " URI = " + getURI();
+        }
+
+        if (unresolved) {
+            output += " [Unresolved]";
+        }
+
+        return output;
+    }
+
+    public String toString() {
+        return "(@" + this.hashCode() + ")" + toStringWithoutHash();
+    }
+
+    public String getURI() {
+        if (uri == null) {
+            if (component != null && service != null && binding != null) {
+                String bindingName = binding.getName();
+                if (bindingName == null) {
+                    bindingName = service.getName();
+                }
+                uri = component.getURI() + "#service-binding(" + service.getName() + "/" + bindingName + ")";
+            } else if (component != null && service != null) {
+                uri = component.getURI() + "#service(" + service.getName() + ")";
+            } else if (component != null) {
+                uri = component.getURI();
+            }
+        }
+        return uri;
+    }
+
+    public void setURI(String uri) {
+        this.uri = uri;
+    }
+
+    protected void resolve() {
+    }
+
+    protected void reset() {
+        this.uri = null;
+    }
+
+    public void setExtensionPointRegistry(ExtensionPointRegistry registry) {
+        this.registry = registry;
+    }
+
+    public boolean isRemote() {
+        return remote;
+    }
+
+    public void setRemote(boolean remote) {
+        this.remote = remote;
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/EndpointReferenceImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/EndpointReferenceImpl.java
new file mode 100644
index 0000000000..4c02be42dd
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/EndpointReferenceImpl.java
@@ -0,0 +1,250 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.assembly.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.Binding;
+import org.apache.tuscany.sca.assembly.Component;
+import org.apache.tuscany.sca.assembly.ComponentReference;
+import org.apache.tuscany.sca.assembly.Endpoint;
+import org.apache.tuscany.sca.assembly.EndpointReference;
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.interfacedef.InterfaceContract;
+import org.apache.tuscany.sca.policy.ExtensionType;
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.PolicySet;
+import org.apache.tuscany.sca.policy.PolicySubject;
+
+/**
+ * The assembly model object for an endpoint.
+ *
+ * @version $Rev$ $Date$
+ */
+public class EndpointReferenceImpl implements EndpointReference {
+    private static final long serialVersionUID = 8838066441709300972L;
+
+    protected ExtensionPointRegistry registry;
+    protected boolean unresolved = true;
+    protected String uri;
+    protected Component component;
+    protected ComponentReference reference;
+    protected Binding binding;
+    protected List<PolicySet> policySets = new ArrayList<PolicySet>();
+    protected List<Intent> requiredIntents = new ArrayList<Intent>();
+    protected InterfaceContract interfaceContract;
+    protected boolean remote = false;
+    protected int status;
+
+    // the target of the endpoint reference
+    protected Endpoint targetEndpoint;
+
+    // callback endpoint that messages across this reference
+    // will be directed toward
+    protected Endpoint callbackEndpoint;
+
+    protected EndpointReferenceImpl(ExtensionPointRegistry registry) {
+        this.registry = registry;
+    }
+
+    @Override
+    public Object clone() throws CloneNotSupportedException {
+        EndpointReference cloned = (EndpointReference)super.clone();
+
+        if (targetEndpoint != null) {
+            cloned.setTargetEndpoint((Endpoint)targetEndpoint.clone());
+        }
+
+        return cloned;
+    }
+
+    public boolean isUnresolved() {
+        return unresolved;
+    }
+
+    public void setUnresolved(boolean unresolved) {
+        this.unresolved = unresolved;
+    }
+
+    public Component getComponent() {
+        resolve();
+        return component;
+    }
+
+    public void setComponent(Component component) {
+        this.component = component;
+        reset();
+    }
+
+    public ComponentReference getReference() {
+        resolve();
+        return reference;
+    }
+
+    public void setReference(ComponentReference reference) {
+        this.reference = reference;
+        reset();
+    }
+
+    public Binding getBinding() {
+        resolve();
+        return binding;
+    }
+
+    public void setBinding(Binding binding) {
+        this.binding = binding;
+        reset();
+    }
+
+    public Endpoint getTargetEndpoint() {
+        resolve();
+        return targetEndpoint;
+    }
+
+    public void setTargetEndpoint(Endpoint targetEndpoint) {
+        this.targetEndpoint = targetEndpoint;
+        reset();
+    }
+
+    public InterfaceContract getInterfaceContract() {
+        resolve();
+        return interfaceContract;
+    }
+
+    public void setInterfaceContract(InterfaceContract interfaceContract) {
+        this.interfaceContract = interfaceContract;
+        reset();
+    }
+
+    public List<PolicySet> getPolicySets() {
+        resolve();
+        return policySets;
+    }
+
+    public List<Intent> getRequiredIntents() {
+        resolve();
+        return requiredIntents;
+    }
+
+    public ExtensionType getExtensionType() {
+        if (binding instanceof PolicySubject) {
+            return ((PolicySubject)binding).getExtensionType();
+        }
+        return null;
+    }
+
+    public void setExtensionType(ExtensionType type) {
+        throw new UnsupportedOperationException();
+    }
+
+    public Endpoint getCallbackEndpoint() {
+        resolve();
+        return callbackEndpoint;
+    }
+
+    public void setCallbackEndpoint(Endpoint callbackEndpoint) {
+        this.callbackEndpoint = callbackEndpoint;
+        reset();
+    }
+    
+    public String toStringWithoutHash() {
+        String output = "EndpointReference: ";
+
+        if (getURI() != null) {
+            output += " URI = " + getURI();
+        }
+
+        switch (status) {
+            case 0:
+                output += " NOT_CONFIGURED ";
+                break;
+            case 1:
+                output += " RESOLVED_BINDING ";
+                break;
+            case 2:
+                output += " WIRED_TARGET_NOT_FOUND ";
+                break;
+            case 3:
+                output += " WIRED_TARGET_FOUND_READY_FOR_MATCHING ";
+                break;
+            case 4:
+                output += " WIRED_TARGET_FOUND_AND_MATCHED ";
+                break;
+        }
+
+        if (targetEndpoint != null) {
+            output += " Target = " + targetEndpoint.toString();
+        }
+
+        return output;
+    }
+
+    public String toString() {
+        return "(@" + this.hashCode() + ")" + toStringWithoutHash();
+    }
+
+    public String getURI() {
+        if (uri == null) {
+            if (component != null && reference != null && binding != null) {
+                String bindingName = binding.getName();
+                if (bindingName == null) {
+                    bindingName = reference.getName();
+                }
+                uri = component.getURI() + "#reference-binding(" + reference.getName() + "/" + bindingName + ")";
+            } else if (component != null && reference != null) {
+                uri = component.getURI() + "#reference(" + reference.getName() + ")";
+            } else if (component != null) {
+                uri = component.getURI();
+            }
+        }
+        return uri;
+    }
+
+    public void setURI(String uri) {
+        this.uri = uri;
+    }
+
+    public boolean isRemote() {
+        return remote;
+    }
+
+    public void setRemote(boolean remote) {
+        this.remote = remote;
+    }
+
+    protected void resolve() {
+    }
+
+    protected void reset() {
+        this.uri = null;
+    }
+
+    public void setExtensionPointRegistry(ExtensionPointRegistry registry) {
+        this.registry = registry;
+    }
+
+    public int getStatus() {
+        return status;
+    }
+
+    public void setStatus(int status) {
+        this.status = status;
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ExtensibleImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ExtensibleImpl.java
new file mode 100644
index 0000000000..340fa2854c
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ExtensibleImpl.java
@@ -0,0 +1,49 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.Extensible;
+import org.apache.tuscany.sca.assembly.Extension;
+
+/**
+ * Convenience base class for extensible assembly model objects.
+ * 
+ * @version $Rev$ $Date$
+ */
+public abstract class ExtensibleImpl extends BaseImpl implements Extensible {
+    private List<Object> extensions = new ArrayList<Object>();
+    private List<Extension> attributeExtensions = new ArrayList<Extension>();
+
+    /**
+     * Constructs a new base model object.
+     */
+    protected ExtensibleImpl() {
+    }
+
+    public List<Object> getExtensions() {
+        return extensions;
+    }
+
+    public List<Extension> getAttributeExtensions() {
+        return attributeExtensions;
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ExtensionImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ExtensionImpl.java
new file mode 100644
index 0000000000..b5018c4d43
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ExtensionImpl.java
@@ -0,0 +1,62 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly.impl;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.assembly.Extension;
+
+public class ExtensionImpl implements Extension {
+    private QName qName;
+    private Object value;
+    boolean isAttribute = false;
+
+    public ExtensionImpl() {
+    }
+
+    public ExtensionImpl(QName qName, Object value, boolean isAttribute) {
+        this.qName = qName;
+        this.value = value;
+        this.isAttribute = isAttribute;
+    }
+
+    public QName getQName() {
+        return qName;
+    }
+
+    public void setQName(QName qName) {
+        this.qName = qName;
+    }
+
+    public <T> T getValue() {
+        return (T)value;
+    }
+
+    public <T> void setValue(T value) {
+        this.value = value;
+    }
+
+    public boolean isAttribute() {
+        return isAttribute;
+    }
+
+    public void setAttribute(boolean isAttribute) {
+        this.isAttribute = isAttribute;
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ImplementationImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ImplementationImpl.java
new file mode 100644
index 0000000000..20c7ea3206
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ImplementationImpl.java
@@ -0,0 +1,76 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.tuscany.sca.assembly.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.assembly.Implementation;
+import org.apache.tuscany.sca.interfacedef.Operation;
+import org.apache.tuscany.sca.policy.ExtensionType;
+import org.apache.tuscany.sca.policy.PolicySubject;
+
+/**
+ * Base implementation class of Implementation model interface
+ *
+ * @version $Rev$ $Date$
+ */
+public abstract class ImplementationImpl extends ComponentTypeImpl implements Implementation, PolicySubject {
+    private QName type;
+    private ExtensionType extensionType;
+    private List<Operation> operations = new ArrayList<Operation>();
+
+    protected ImplementationImpl(QName type) {
+        super();
+        this.type = type;
+    }
+
+    public ExtensionType getExtensionType() {
+        return extensionType;
+    }
+
+    public void setExtensionType(ExtensionType extensionType) {
+        this.extensionType = extensionType;
+    }
+
+    public QName getType() {
+        return type;
+    }
+    
+    public String toString() {
+        return String.valueOf(getType());
+    }
+
+    public List<Operation> getOperations() {
+        return operations;
+    }
+
+    @Override
+    public Object clone() throws CloneNotSupportedException {
+        ImplementationImpl impl = (ImplementationImpl)super.clone();
+        impl.operations = new ArrayList<Operation>();
+        for (Operation operation : operations) {
+            impl.operations.add((Operation)operation.clone());
+        }
+        return impl;
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/PropertyImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/PropertyImpl.java
new file mode 100644
index 0000000000..263af296b1
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/PropertyImpl.java
@@ -0,0 +1,59 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.assembly.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.Property;
+import org.apache.tuscany.sca.policy.PolicySet;
+
+/**
+ * Represents a property.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class PropertyImpl extends AbstractPropertyImpl implements Property, Cloneable {
+    private List<PolicySet> policySets = new ArrayList<PolicySet>();
+    private List<PolicySet> applicablePolicySets = new ArrayList<PolicySet>();
+
+    /**
+     * Constructs a new property.
+     */
+    protected PropertyImpl() {
+    }
+
+    @Override
+    public Object clone() throws CloneNotSupportedException {
+        return super.clone();
+    }
+
+    public List<PolicySet> getPolicySets() {
+        return policySets;
+    }
+
+    public void setPolicySets(List<PolicySet> policySets) {
+        this.policySets = policySets;
+    }
+
+    public List<PolicySet> getApplicablePolicySets() {
+        return applicablePolicySets;
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ReferenceImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ReferenceImpl.java
new file mode 100644
index 0000000000..af4b3559c5
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ReferenceImpl.java
@@ -0,0 +1,144 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.assembly.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.Binding;
+import org.apache.tuscany.sca.assembly.Callback;
+import org.apache.tuscany.sca.assembly.ComponentReference;
+import org.apache.tuscany.sca.assembly.ComponentService;
+import org.apache.tuscany.sca.assembly.EndpointReference;
+import org.apache.tuscany.sca.assembly.Reference;
+import org.apache.tuscany.sca.interfacedef.InterfaceContract;
+
+/**
+ * Represents a reference.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class ReferenceImpl extends AbstractReferenceImpl implements Reference, Cloneable {
+    private List<Binding> bindings = new ArrayList<Binding>();
+    private boolean wiredByImpl;
+    private List<ComponentService> targets = new ArrayList<ComponentService>();
+    private Callback callback;
+    private boolean promotionOverride;
+    private boolean overridingBindings;
+    private List<EndpointReference> endpointReferences = new ArrayList<EndpointReference>();
+
+    /**
+     * Constructs a new reference.
+     */
+    protected ReferenceImpl() {
+    }
+
+    @Override
+    public Object clone() throws CloneNotSupportedException {
+        ReferenceImpl clone = (ReferenceImpl)super.clone();
+        clone.bindings = new ArrayList<Binding>(bindings);
+        clone.targets = new ArrayList<ComponentService>(targets);
+        // clone the endpoint references themselves and set the reference pointer back to 
+        // this new refrence
+        clone.endpointReferences = new ArrayList<EndpointReference>();
+
+        for (EndpointReference epr : endpointReferences) {
+            EndpointReference eprClone = (EndpointReference)epr.clone();
+            eprClone.setReference((ComponentReference)clone);
+            clone.endpointReferences.add(eprClone);
+        }
+        return clone;
+    }
+
+    public List<Binding> getBindings() {
+        return bindings;
+    }
+
+    public <B> B getBinding(Class<B> bindingClass) {
+        for (Binding binding : bindings) {
+            if (bindingClass.isInstance(binding)) {
+                return bindingClass.cast(binding);
+            }
+        }
+        return null;
+    }
+
+    public <B> B getCallbackBinding(Class<B> bindingClass) {
+        if (callback != null) {
+            for (Binding binding : callback.getBindings()) {
+                if (bindingClass.isInstance(binding)) {
+                    return bindingClass.cast(binding);
+                }
+            }
+        }
+        return null;
+    }
+
+    public boolean isWiredByImpl() {
+        return wiredByImpl;
+    }
+
+    public void setWiredByImpl(boolean wiredByImpl) {
+        this.wiredByImpl = wiredByImpl;
+    }
+
+    public boolean isPromotionOverride() {
+        return promotionOverride;
+    }
+
+    public void setPromotionOverride(boolean promotionOverride) {
+        this.promotionOverride = promotionOverride;
+    }
+
+    public List<ComponentService> getTargets() {
+        return targets;
+    }
+
+    public Callback getCallback() {
+        return callback;
+    }
+
+    public void setCallback(Callback callback) {
+        this.callback = callback;
+    }
+
+    /**
+     * By default return the interface contract for the reference
+     */
+    public InterfaceContract getInterfaceContract(Binding binding) {
+        return getInterfaceContract();
+    }
+
+    public List<EndpointReference> getEndpointReferences() {
+        return endpointReferences;
+    }
+
+    public String toString() {
+        return getName();
+    }
+
+    public boolean isOverridingBindings() {
+        return overridingBindings;
+    }
+
+    public void setOverridingBindings(boolean overridingBindings) {
+        this.overridingBindings = overridingBindings;
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/SCABindingFactoryImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/SCABindingFactoryImpl.java
new file mode 100644
index 0000000000..cf7e744e88
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/SCABindingFactoryImpl.java
@@ -0,0 +1,45 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.tuscany.sca.assembly.impl;
+
+import org.apache.tuscany.sca.assembly.DistributedSCABinding;
+import org.apache.tuscany.sca.assembly.SCABinding;
+import org.apache.tuscany.sca.assembly.SCABindingFactory;
+
+/**
+ * A factory for the SCA binding model.
+ *
+ * @version $Rev$ $Date$
+ */
+public class SCABindingFactoryImpl implements SCABindingFactory {
+
+    public SCABindingFactoryImpl() {
+
+    }
+
+    public SCABinding createSCABinding() {
+        return new SCABindingImpl();
+    }
+
+    public DistributedSCABinding createDistributedSCABinding() {
+        return new DistributedSCABindingImpl();
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/SCABindingImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/SCABindingImpl.java
new file mode 100644
index 0000000000..b67dbcbb12
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/SCABindingImpl.java
@@ -0,0 +1,168 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.assembly.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.assembly.Binding;
+import org.apache.tuscany.sca.assembly.Component;
+import org.apache.tuscany.sca.assembly.ComponentService;
+import org.apache.tuscany.sca.assembly.Extensible;
+import org.apache.tuscany.sca.assembly.Extension;
+import org.apache.tuscany.sca.assembly.OptimizableBinding;
+import org.apache.tuscany.sca.assembly.SCABinding;
+import org.apache.tuscany.sca.policy.ExtensionType;
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.PolicySet;
+import org.apache.tuscany.sca.policy.PolicySubject;
+
+/**
+ * The assembly mode object for an SCA binding.
+ *
+ * @version $Rev$ $Date$
+ */
+public class SCABindingImpl implements SCABinding, Extensible, PolicySubject, OptimizableBinding {
+    private String name;
+    private String uri;
+    private List<Object> extensions = new ArrayList<Object>();
+    private List<Extension> attributeExtensions = new ArrayList<Extension>();
+    private List<Intent> requiredIntents = new ArrayList<Intent>();
+    private List<PolicySet> policySets = new ArrayList<PolicySet>();
+    private ExtensionType extensionType;
+
+    private Component targetComponent;
+    private ComponentService targetComponentService;
+    private Binding targetBinding;
+    private List<PolicySet> applicablePolicySets = new ArrayList<PolicySet>();
+
+    public List<PolicySet> getApplicablePolicySets() {
+        return applicablePolicySets;
+    }
+
+    /**
+     * Constructs a new SCA binding.
+     */
+    protected SCABindingImpl() {
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    /**
+     * Getters for the binding URI. The computed URI for the
+     * service that the reference is targeting or which the service represents
+     * depending on whether the biding is associated with a reference or
+     * service
+     *
+     * @return the binding URI
+     */
+    public String getURI() {
+        return uri;
+    }
+
+    public void setURI(String uri) {
+        this.uri = uri;
+    }
+
+    public List<Object> getExtensions() {
+        return extensions;
+    }
+
+    public List<Extension> getAttributeExtensions() {
+        return attributeExtensions;
+    }
+
+    public boolean isUnresolved() {
+        if (targetComponentService == null) {
+            return true;
+        } else {
+            return targetComponentService.isUnresolved();
+        }
+    }
+
+    public void setUnresolved(boolean unresolved) {
+    }
+
+    public List<PolicySet> getPolicySets() {
+        return policySets;
+    }
+
+    public List<Intent> getRequiredIntents() {
+        return requiredIntents;
+    }
+
+    public ExtensionType getExtensionType() {
+        return extensionType;
+    }
+
+    public void setExtensionType(ExtensionType intentAttachPointType) {
+        this.extensionType = intentAttachPointType;
+    }
+
+    // Wireable binding operations
+
+    public Component getTargetComponent() {
+        return targetComponent;
+    }
+
+    public void setTargetComponent(Component targetComponent) {
+        this.targetComponent = targetComponent;
+    }
+
+    public ComponentService getTargetComponentService() {
+        return targetComponentService;
+    }
+
+    public void setTargetComponentService(ComponentService targetComponentService) {
+        this.targetComponentService = targetComponentService;
+    }
+
+    public Binding getTargetBinding() {
+        return targetBinding;
+    }
+
+    public void setTargetBinding(Binding targetBinding) {
+        this.targetBinding = targetBinding;
+    }
+
+    public void setPolicySets(List<PolicySet> policySets) {
+        this.policySets = policySets;
+    }
+
+    public void setRequiredIntents(List<Intent> intents) {
+        this.requiredIntents = intents;
+    }
+
+    @Override
+    public Object clone() throws CloneNotSupportedException {
+        return super.clone();
+    }
+
+    public QName getType() {
+        return TYPE;
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ServiceImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ServiceImpl.java
new file mode 100644
index 0000000000..62523e5c17
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/ServiceImpl.java
@@ -0,0 +1,106 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.assembly.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.Binding;
+import org.apache.tuscany.sca.assembly.Callback;
+import org.apache.tuscany.sca.assembly.Endpoint;
+import org.apache.tuscany.sca.assembly.Service;
+import org.apache.tuscany.sca.interfacedef.InterfaceContract;
+
+/**
+ * Represents a reference.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class ServiceImpl extends AbstractServiceImpl implements Service, Cloneable {
+    private List<Binding> bindings = new ArrayList<Binding>();
+    private boolean overridingBindings;
+    private Callback callback;
+    private List<Endpoint> endpoints = new ArrayList<Endpoint>();
+
+    /**
+     * Constructs a new service.
+     */
+    protected ServiceImpl() {
+    }
+
+    @Override
+    public Object clone() throws CloneNotSupportedException {
+        ServiceImpl clone = (ServiceImpl)super.clone();
+        clone.bindings = new ArrayList<Binding>();
+        clone.bindings.addAll(getBindings());
+        return clone;
+    }
+
+    public List<Binding> getBindings() {
+        return bindings;
+    }
+
+    public <B> B getBinding(Class<B> bindingClass) {
+        for (Binding binding : bindings) {
+            if (bindingClass.isInstance(binding)) {
+                return bindingClass.cast(binding);
+            }
+        }
+        return null;
+    }
+
+    public <B> B getCallbackBinding(Class<B> bindingClass) {
+        if (callback != null) {
+            for (Binding binding : callback.getBindings()) {
+                if (bindingClass.isInstance(binding)) {
+                    return bindingClass.cast(binding);
+                }
+            }
+        }
+        return null;
+    }
+
+    public Callback getCallback() {
+        return callback;
+    }
+
+    public void setCallback(Callback callback) {
+        this.callback = callback;
+    }
+
+    /**
+     * By default return the interface contract for the service
+     */
+    public InterfaceContract getInterfaceContract(Binding binding) {
+        return getInterfaceContract();
+    }
+
+    public List<Endpoint> getEndpoints() {
+        return endpoints;
+    }
+
+    public boolean isOverridingBindings() {
+        return overridingBindings;
+    }
+
+    public void setOverridingBindings(boolean overridingBindings) {
+        this.overridingBindings = overridingBindings;
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/WireImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/WireImpl.java
new file mode 100644
index 0000000000..a4990f6a98
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/impl/WireImpl.java
@@ -0,0 +1,105 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.assembly.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.ComponentReference;
+import org.apache.tuscany.sca.assembly.ComponentService;
+import org.apache.tuscany.sca.assembly.Wire;
+import org.apache.tuscany.sca.policy.ExtensionType;
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.PolicySet;
+
+/**
+ * Represents a wire
+ * 
+ * @version $Rev$ $Date$
+ */
+public class WireImpl extends ExtensibleImpl implements Wire, Cloneable {
+    private ComponentReference source;
+    private ComponentService target;
+    private boolean replace;
+    private List<Intent> requiredIntents = new ArrayList<Intent>();
+    private List<PolicySet> policySets = new ArrayList<PolicySet>();
+    private List<PolicySet> applicablePolicySets = new ArrayList<PolicySet>();
+
+    public List<PolicySet> getApplicablePolicySets() {
+        return applicablePolicySets;
+    }
+
+    /**
+     * Constructs a new wire.
+     */
+    protected WireImpl() {
+    }
+
+    @Override
+    public Object clone() throws CloneNotSupportedException {
+        return super.clone();
+    }
+
+    public ComponentReference getSource() {
+        return source;
+    }
+
+    public ComponentService getTarget() {
+        return target;
+    }
+
+    public void setSource(ComponentReference source) {
+        this.source = source;
+    }
+
+    public void setTarget(ComponentService target) {
+        this.target = target;
+    }
+
+    public List<Intent> getRequiredIntents() {
+        return requiredIntents;
+    }
+
+    public List<PolicySet> getPolicySets() {
+        return policySets;
+    }
+
+    public ExtensionType getExtensionType() {
+        return null;
+    }
+
+    public void setExtensionType(ExtensionType type) {
+    }
+
+    public void setPolicySets(List<PolicySet> policySets) {
+        this.policySets = policySets;
+    }
+
+    public void setRequiredIntents(List<Intent> intents) {
+        this.requiredIntents = intents;
+    }
+
+    public boolean isReplace() {
+        return replace;
+    }
+
+    public void setReplace(boolean replace) {
+        this.replace = replace;
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/DefaultDefinitionsFactory.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/DefaultDefinitionsFactory.java
new file mode 100644
index 0000000000..156fd0af75
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/DefaultDefinitionsFactory.java
@@ -0,0 +1,32 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.definitions;
+
+import org.apache.tuscany.sca.definitions.impl.DefinitionsImpl;
+
+/**
+ * Default Implementation of DefinitionsFactory
+ */
+public class DefaultDefinitionsFactory implements DefinitionsFactory {
+
+    public Definitions createDefinitions() {
+        return new DefinitionsImpl();
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/Definitions.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/Definitions.java
new file mode 100644
index 0000000000..7a63bbedc5
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/Definitions.java
@@ -0,0 +1,84 @@
+ /*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.definitions;
+
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.Binding;
+import org.apache.tuscany.sca.policy.BindingType;
+import org.apache.tuscany.sca.policy.ImplementationType;
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.PolicySet;
+
+
+/**
+ * Represents SCA Definitions.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface Definitions {
+    /**
+     * Returns the target namespace for this SCA Definition
+     * @return the target namespace
+     */
+    String getTargetNamespace();
+    
+    /**
+     * Sets the target names for this SCA Definition.
+     * 
+     * @param ns the target namespace for this SCA Definition
+     */
+    void setTargetNamespace(String ns);
+
+    /**
+     * Returns a list of domain wide Policy Intents
+     * 
+     * @return a list of domain wide Policy Intents 
+     */
+    List<Intent> getIntents();
+    
+    /**
+     * Returns a list of domain wide PolicySets
+     * 
+     * @return a list of domain wide PolicySets 
+     */
+    List<PolicySet> getPolicySets();
+    
+    /**
+     * Returns a list of domain wide Binding Types
+     * 
+     * @return a list of domain wide Binding Types 
+     */
+    List<BindingType> getBindingTypes();
+    
+    
+    /**
+     * Returns a list of domain wide Implementation Types
+     * 
+     * @return a list of domain wide Implementation Types 
+     */
+    List<ImplementationType> getImplementationTypes();
+
+    /**
+     * Returns a list of domain wide binding definition objects
+     * 
+     * @return a list of domain wide binding definition objects 
+     */
+    List<Binding> getBindings();
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/DefinitionsBuilder.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/DefinitionsBuilder.java
new file mode 100644
index 0000000000..5c68c6cbff
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/DefinitionsBuilder.java
@@ -0,0 +1,34 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.definitions;
+
+
+/**
+ * Interface to abstract building of SCA Definitions for a Domain
+ *
+ * @version $Rev$ $Date$
+ */
+public interface DefinitionsBuilder {
+    /**
+     * Builds the SCA definitions 
+     * 
+     * @param scaDefns
+     */
+    void build(Definitions scaDefns) throws DefinitionsBuilderException;
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/DefinitionsBuilderException.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/DefinitionsBuilderException.java
new file mode 100644
index 0000000000..f45be80888
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/DefinitionsBuilderException.java
@@ -0,0 +1,43 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.definitions;
+
+/**
+ * Builder Exception
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefinitionsBuilderException extends Exception {
+    private static final long serialVersionUID = 2513219325230252783L;
+
+    public DefinitionsBuilderException() {
+    }
+
+    public DefinitionsBuilderException(String message) {
+        super(message);
+    }
+
+    public DefinitionsBuilderException(Throwable cause) {
+        super(cause);
+    }
+
+    public DefinitionsBuilderException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/DefinitionsFactory.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/DefinitionsFactory.java
new file mode 100644
index 0000000000..616616ae7a
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/DefinitionsFactory.java
@@ -0,0 +1,31 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.definitions;
+
+/**
+ * Factory interface to create SCA definitions model
+ *
+ */
+public interface DefinitionsFactory {
+    /**
+     * Create an instance of SCA definitions
+     * @return a new instance of SCA definitions
+     */
+    Definitions createDefinitions();
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/impl/DefinitionsBuilderImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/impl/DefinitionsBuilderImpl.java
new file mode 100644
index 0000000000..d87d45b27a
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/impl/DefinitionsBuilderImpl.java
@@ -0,0 +1,307 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.definitions.impl;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.definitions.Definitions;
+import org.apache.tuscany.sca.definitions.DefinitionsBuilder;
+import org.apache.tuscany.sca.definitions.DefinitionsBuilderException;
+import org.apache.tuscany.sca.policy.BindingType;
+import org.apache.tuscany.sca.policy.ExtensionType;
+import org.apache.tuscany.sca.policy.ImplementationType;
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.IntentMap;
+import org.apache.tuscany.sca.policy.PolicySet;
+import org.apache.tuscany.sca.policy.Qualifier;
+
+/**
+ * Provides a concrete implementation for a SCADefinitionsBuilder
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefinitionsBuilderImpl implements DefinitionsBuilder {
+
+    public void build(Definitions scaDefns) throws DefinitionsBuilderException {
+        Map<QName, Intent> definedIntents = new HashMap<QName, Intent>();
+        for (Intent intent : scaDefns.getIntents()) {
+            definedIntents.put(intent.getName(), intent);
+        }
+
+        Map<QName, PolicySet> definedPolicySets = new HashMap<QName, PolicySet>();
+        for (PolicySet policySet : scaDefns.getPolicySets()) {
+            definedPolicySets.put(policySet.getName(), policySet);
+        }
+
+        Map<QName, BindingType> definedBindingTypes = new HashMap<QName, BindingType>();
+        for (BindingType bindingType : scaDefns.getBindingTypes()) {
+            definedBindingTypes.put(bindingType.getType(), bindingType);
+        }
+
+        Map<QName, ImplementationType> definedImplTypes = new HashMap<QName, ImplementationType>();
+        for (ImplementationType implType : scaDefns.getImplementationTypes()) {
+            definedImplTypes.put(implType.getType(), implType);
+        }
+
+        //filling up the maps removes all duplicate entries... so fill this unique lists
+        //into the scaDefns.
+        scaDefns.getIntents().clear();
+        scaDefns.getPolicySets().clear();
+        scaDefns.getBindingTypes().clear();
+        scaDefns.getImplementationTypes().clear();
+
+        scaDefns.getIntents().addAll(definedIntents.values());
+        scaDefns.getPolicySets().addAll(definedPolicySets.values());
+        scaDefns.getBindingTypes().addAll(definedBindingTypes.values());
+        scaDefns.getImplementationTypes().addAll(definedImplTypes.values());
+
+        buildPolicyIntents(scaDefns, definedIntents);
+        buildPolicySets(scaDefns, definedPolicySets, definedIntents);
+        buildBindingTypes(scaDefns, definedBindingTypes, definedIntents);
+        buildImplementationTypes(scaDefns, definedImplTypes, definedIntents);
+    }
+
+    private void buildBindingTypes(Definitions scaDefns,
+                                   Map<QName, BindingType> definedBindingTypes,
+                                   Map<QName, Intent> definedIntents) throws DefinitionsBuilderException {
+        for (BindingType bindingType : scaDefns.getBindingTypes()) {
+            buildAlwaysProvidedIntents(bindingType, definedIntents);
+            buildMayProvideIntents(bindingType, definedIntents);
+        }
+
+    }
+
+    private void buildImplementationTypes(Definitions scaDefns,
+                                          Map<QName, ImplementationType> definedImplTypes,
+                                          Map<QName, Intent> definedIntents) throws DefinitionsBuilderException {
+        for (ImplementationType implType : scaDefns.getImplementationTypes()) {
+            buildAlwaysProvidedIntents(implType, definedIntents);
+            buildMayProvideIntents(implType, definedIntents);
+        }
+    }
+
+    private void buildPolicyIntents(Definitions scaDefns, Map<QName, Intent> definedIntents)
+        throws DefinitionsBuilderException {
+        for (Intent policyIntent : scaDefns.getIntents()) {
+            if (!policyIntent.getRequiredIntents().isEmpty()) {
+                buildProfileIntent(policyIntent, definedIntents);
+            }
+
+            if (!policyIntent.getQualifiedIntents().isEmpty()) {
+                buildQualifiedIntent(policyIntent, definedIntents);
+            }
+        }
+    }
+
+    private void buildPolicySets(Definitions scaDefns,
+                                 Map<QName, PolicySet> definedPolicySets,
+                                 Map<QName, Intent> definedIntents) throws DefinitionsBuilderException {
+
+        for (PolicySet policySet : scaDefns.getPolicySets()) {
+            buildProvidedIntents(policySet, definedIntents);
+            buildIntentsInMappedPolicies(policySet, definedIntents);
+            buildReferredPolicySets(policySet, definedPolicySets);
+        }
+
+        for (PolicySet policySet : scaDefns.getPolicySets()) {
+            for (PolicySet referredPolicySet : policySet.getReferencedPolicySets()) {
+                includeReferredPolicySets(policySet, referredPolicySet);
+            }
+        }
+    }
+
+    private void buildProfileIntent(Intent policyIntent, Map<QName, Intent> definedIntents)
+        throws DefinitionsBuilderException {
+        //FIXME: Need to check for cyclic references first i.e an A requiring B and then B requiring A... 
+        if (policyIntent != null) {
+            //resolve all required intents
+            List<Intent> requiredIntents = new ArrayList<Intent>();
+            for (Intent requiredIntent : policyIntent.getRequiredIntents()) {
+                if (requiredIntent.isUnresolved()) {
+                    Intent resolvedRequiredIntent = definedIntents.get(requiredIntent.getName());
+                    if (resolvedRequiredIntent != null) {
+                        requiredIntents.add(resolvedRequiredIntent);
+                    } else {
+                        throw new DefinitionsBuilderException("Required Intent - " + requiredIntent
+                            + " not found for ProfileIntent "
+                            + policyIntent);
+
+                    }
+                } else {
+                    requiredIntents.add(requiredIntent);
+                }
+            }
+            policyIntent.getRequiredIntents().clear();
+            policyIntent.getRequiredIntents().addAll(requiredIntents);
+        }
+    }
+
+    private void buildQualifiedIntent(Intent policyIntent, Map<QName, Intent> definedIntents)
+        throws DefinitionsBuilderException {
+        /*
+        if (policyIntent != null) {
+            //resolve the qualifiable intent
+            Intent qualifiableIntent = policyIntent.getQualifiableIntent();
+            if (qualifiableIntent.isUnresolved()) {
+                Intent resolvedQualifiableIntent = definedIntents.get(qualifiableIntent.getName());
+
+                if (resolvedQualifiableIntent != null) {
+                    policyIntent.setQualifiableIntent(resolvedQualifiableIntent);
+                } else {
+                    throw new DefinitionsBuilderException("Qualifiable Intent - " + qualifiableIntent
+                        + " not found for QualifiedIntent "
+                        + policyIntent);
+                }
+
+            }
+        }
+        */
+    }
+
+    private void buildAlwaysProvidedIntents(ExtensionType extensionType, Map<QName, Intent> definedIntents)
+        throws DefinitionsBuilderException {
+        if (extensionType != null) {
+            // resolve all provided intents
+            List<Intent> alwaysProvided = new ArrayList<Intent>();
+            for (Intent providedIntent : extensionType.getAlwaysProvidedIntents()) {
+                if (providedIntent.isUnresolved()) {
+                    Intent resolvedProvidedIntent = definedIntents.get(providedIntent.getName());
+                    if (resolvedProvidedIntent != null) {
+                        alwaysProvided.add(resolvedProvidedIntent);
+                    } else {
+                        throw new DefinitionsBuilderException("Always Provided Intent - " + providedIntent
+                            + " not found for ExtensionType "
+                            + extensionType);
+
+                    }
+                } else {
+                    alwaysProvided.add(providedIntent);
+                }
+            }
+            extensionType.getAlwaysProvidedIntents().clear();
+            extensionType.getAlwaysProvidedIntents().addAll(alwaysProvided);
+        }
+    }
+
+    private void buildMayProvideIntents(ExtensionType extensionType, Map<QName, Intent> definedIntents)
+        throws DefinitionsBuilderException {
+        if (extensionType != null) {
+            // resolve all provided intents
+            List<Intent> mayProvide = new ArrayList<Intent>();
+            for (Intent providedIntent : extensionType.getMayProvidedIntents()) {
+                if (providedIntent.isUnresolved()) {
+                    Intent resolvedProvidedIntent = definedIntents.get(providedIntent.getName());
+                    if (resolvedProvidedIntent != null) {
+                        mayProvide.add(resolvedProvidedIntent);
+                    } else {
+                        throw new DefinitionsBuilderException("May Provide Intent - " + providedIntent
+                            + " not found for ExtensionType "
+                            + extensionType);
+
+                    }
+                } else {
+                    mayProvide.add(providedIntent);
+                }
+            }
+            extensionType.getMayProvidedIntents().clear();
+            extensionType.getMayProvidedIntents().addAll(mayProvide);
+        }
+    }
+
+    private void buildProvidedIntents(PolicySet policySet, Map<QName, Intent> definedIntents)
+        throws DefinitionsBuilderException {
+        if (policySet != null) {
+            //resolve all provided intents
+            List<Intent> providedIntents = new ArrayList<Intent>();
+            for (Intent providedIntent : policySet.getProvidedIntents()) {
+                if (providedIntent.isUnresolved()) {
+                    Intent resolvedProvidedIntent = definedIntents.get(providedIntent.getName());
+                    if (resolvedProvidedIntent != null) {
+                        providedIntents.add(resolvedProvidedIntent);
+                    } else {
+                        throw new DefinitionsBuilderException("Provided Intent - " + providedIntent
+                            + " not found for PolicySet "
+                            + policySet);
+
+                    }
+                } else {
+                    providedIntents.add(providedIntent);
+                }
+            }
+            policySet.getProvidedIntents().clear();
+            policySet.getProvidedIntents().addAll(providedIntents);
+        }
+    }
+
+    private void buildIntentsInMappedPolicies(PolicySet policySet, Map<QName, Intent> definedIntents)
+        throws DefinitionsBuilderException {
+        for (IntentMap intentMap : policySet.getIntentMaps()) {
+            for (Qualifier qualifier : intentMap.getQualifiers()) {
+                Intent mappedIntent = qualifier.getIntent();
+                if (mappedIntent.isUnresolved()) {
+                    Intent resolvedMappedIntent = definedIntents.get(mappedIntent.getName());
+
+                    if (resolvedMappedIntent != null) {
+                        qualifier.setIntent(resolvedMappedIntent);
+                    } else {
+                        throw new DefinitionsBuilderException("Mapped Intent - " + mappedIntent
+                            + " not found for PolicySet "
+                            + policySet);
+
+                    }
+                }
+            }
+        }
+    }
+
+    private void buildReferredPolicySets(PolicySet policySet, Map<QName, PolicySet> definedPolicySets)
+        throws DefinitionsBuilderException {
+
+        List<PolicySet> referredPolicySets = new ArrayList<PolicySet>();
+        for (PolicySet referredPolicySet : policySet.getReferencedPolicySets()) {
+            if (referredPolicySet.isUnresolved()) {
+                PolicySet resolvedReferredPolicySet = definedPolicySets.get(referredPolicySet.getName());
+                if (resolvedReferredPolicySet != null) {
+                    referredPolicySets.add(resolvedReferredPolicySet);
+                } else {
+                    throw new DefinitionsBuilderException("Referred PolicySet - " + referredPolicySet
+                        + "not found for PolicySet - "
+                        + policySet);
+                }
+            } else {
+                referredPolicySets.add(referredPolicySet);
+            }
+        }
+        policySet.getReferencedPolicySets().clear();
+        policySet.getReferencedPolicySets().addAll(referredPolicySets);
+    }
+
+    private void includeReferredPolicySets(PolicySet policySet, PolicySet referredPolicySet) {
+        for (PolicySet furtherReferredPolicySet : referredPolicySet.getReferencedPolicySets()) {
+            includeReferredPolicySets(referredPolicySet, furtherReferredPolicySet);
+        }
+        policySet.getPolicies().addAll(referredPolicySet.getPolicies());
+        policySet.getIntentMaps().addAll(referredPolicySet.getIntentMaps());
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/impl/DefinitionsImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/impl/DefinitionsImpl.java
new file mode 100644
index 0000000000..224bc0a69a
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/impl/DefinitionsImpl.java
@@ -0,0 +1,73 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.definitions.impl;
+
+import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
+
+import org.apache.tuscany.sca.assembly.Binding;
+import org.apache.tuscany.sca.definitions.Definitions;
+import org.apache.tuscany.sca.policy.BindingType;
+import org.apache.tuscany.sca.policy.ImplementationType;
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.PolicySet;
+
+/**
+ * Provides a concrete implementation for SCADefinitions
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefinitionsImpl implements Definitions {
+    private String targetNamespace = null;
+    private List<Intent> intents = new CopyOnWriteArrayList<Intent>();
+    private List<PolicySet> policySets = new CopyOnWriteArrayList<PolicySet>();
+    private List<BindingType> bindingTypes = new CopyOnWriteArrayList<BindingType>();
+    private List<ImplementationType> implementationTypes = new CopyOnWriteArrayList<ImplementationType>();
+    private List<Binding> bindings = new CopyOnWriteArrayList<Binding>();
+
+   
+    public List<BindingType> getBindingTypes() {
+        return bindingTypes;
+    }
+
+    public List<ImplementationType> getImplementationTypes() {
+        return implementationTypes;
+    }
+
+    public List<Intent> getIntents() {
+        return intents;
+    }
+
+    public List<PolicySet> getPolicySets() {
+        return policySets;
+    }
+
+    public String getTargetNamespace() {
+        return targetNamespace;
+    }
+
+    public void setTargetNamespace(String ns) {
+       this.targetNamespace = ns;
+    }
+
+    public List<Binding> getBindings() {
+        return bindings;
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/util/DefinitionsUtil.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/util/DefinitionsUtil.java
new file mode 100644
index 0000000000..ead5ecba72
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/definitions/util/DefinitionsUtil.java
@@ -0,0 +1,104 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.definitions.util;
+
+import static org.apache.tuscany.sca.assembly.builder.Messages.DEFINITIONS_VALIDATION;
+
+import java.util.HashSet;
+
+import org.apache.tuscany.sca.definitions.Definitions;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.policy.BindingType;
+import org.apache.tuscany.sca.policy.ImplementationType;
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.PolicySet;
+
+/**
+ * Some utility functions to deal with SCADefinitions
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefinitionsUtil {
+    
+    /**
+     * Add the source set of definitions into the target set of definitions checking that 
+     * definitions artifacts are unique in the process
+     * 
+     * @param source the input definitions collection
+     * @param target the definition collection into which source will aggregated
+     */
+    public static void aggregate(Definitions source, Definitions target, Monitor monitor) {
+        
+        HashSet<Intent> intents = new HashSet<Intent>(target.getIntents());
+        for(Intent intent : source.getIntents()){           
+            if (intents.contains(intent)){
+                Monitor.error(monitor, 
+                              target, 
+                              DEFINITIONS_VALIDATION, 
+                              "DuplicateIntent", 
+                              intent.getName().toString());
+            } else {          
+                target.getIntents().add(intent);
+            }
+        }
+        
+        HashSet<PolicySet> policySets = new HashSet<PolicySet>(target.getPolicySets());
+        for(PolicySet policySet : source.getPolicySets()){           
+            if (policySets.contains(policySet)){
+                Monitor.error(monitor, 
+                              target, 
+                              DEFINITIONS_VALIDATION, 
+                              "DuplicatePolicySet", 
+                              policySet.getName().toString());
+            } else {          
+                target.getPolicySets().add(policySet);
+            }
+        }        
+
+        HashSet<BindingType> bindingTypes = new HashSet<BindingType>(target.getBindingTypes());
+        for(BindingType bindingType : source.getBindingTypes()){           
+            if (bindingTypes.contains(bindingType)){
+                Monitor.error(monitor, 
+                              target, 
+                              DEFINITIONS_VALIDATION, 
+                              "DuplicateBindingType", 
+                              bindingType.getType().toString());
+            } else {          
+                target.getBindingTypes().add(bindingType);
+            }
+        }   
+
+        HashSet<ImplementationType> implementationTypes = new HashSet<ImplementationType>(target.getImplementationTypes());
+        for(ImplementationType implementationType : source.getImplementationTypes()){           
+            if (implementationTypes.contains(implementationType)){
+                Monitor.error(monitor, 
+                              target, 
+                              DEFINITIONS_VALIDATION, 
+                              "DuplicateImplementationType", 
+                              implementationType.getType().toString());
+            } else {          
+                target.getImplementationTypes().add(implementationType);
+            }
+        }        
+      
+        target.getBindings().addAll(source.getBindings());
+    }
+    
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/ConversationSequence.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/ConversationSequence.java
new file mode 100644
index 0000000000..247a432330
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/ConversationSequence.java
@@ -0,0 +1,29 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.interfacedef;
+
+/**
+ * Enum of the Conversation Sequence values.
+ *
+ * @version $Rev$ $Date$
+ */
+public enum ConversationSequence {
+    CONVERSATION_NONE, CONVERSATION_START, CONVERSATION_CONTINUE, CONVERSATION_END 
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/DataType.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/DataType.java
new file mode 100644
index 0000000000..1f5620c0b9
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/DataType.java
@@ -0,0 +1,119 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.interfacedef;
+
+import java.lang.reflect.Type;
+
+/**
+ * Representation of the type of data associated with an operation. Data is
+ * represented in two forms: the physical form used by the runtime and a logical
+ * form used by the assembly. The physical form is a Java Type because the
+ * runtime is written in Java. This may be the same form used by the application
+ * but it may not; for example, an application that is performing stream
+ * processing may want a physical form such as an
+ * {@link java.io.InputStream InputStream} to semantially operate on application
+ * data such as a purchase order. The logical description is that used by the
+ * assembly model and is an identifier into some well-known type space; examples
+ * may be a Java type represented by its Class or an XML type represented by its
+ * QName. Every data type may also contain metadata describing the expected
+ * data; for example, it could specify a preferred data binding technology or
+ * the size of a typical instance.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface DataType<L> extends Cloneable {
+    /**
+     * Set the java type for the data
+     * @param cls
+     */
+    void setPhysical(Class<?> cls);
+
+    /**
+     * Returns the physical type used by the runtime.
+     * 
+     * @return the physical type used by the runtime
+     */
+    Class<?> getPhysical();
+
+    /**
+     * Get the java generic type
+     * @return The java generic type
+     */
+    Type getGenericType();
+
+    /**
+     * Set the java generic type
+     * @param genericType
+     */
+    void setGenericType(Type genericType);
+
+    /**
+     * Returns the logical identifier used by the assembly. The type of this
+     * value identifies the logical type system in use. Known values are:
+     * <ul>
+     * <li>a Class identifies a Java type by name and
+     * ClassLoader; this includes Java Classes as they are specializations of
+     * Type</li>
+     * <li>a XMLType identifies an XML type by local name and
+     * namespace</li>
+     * </ul>
+     * 
+     * @return the logical type name
+     */
+    L getLogical();
+
+    /**
+     * Get the databinding for the given data type
+     * @return the databinding
+     */
+    String getDataBinding();
+
+    /**
+     * Set the databinding for the given data type
+     * @param dataBinding the dataBinding to set
+     */
+    void setDataBinding(String dataBinding);
+
+    /**
+     * Clone a data type
+     * @return The cloned data type
+     * @throws CloneNotSupportedException
+     */
+    Object clone() throws CloneNotSupportedException;
+
+    /**
+     * Set the logical type of the data type
+     * @param logical the logical to set
+     */
+    void setLogical(L logical);
+
+    /**
+     * Get the databinding-specific metadata
+     * @param type The java type of the metadata
+     * @return the databinding-specific metadata
+     */
+    <T> T getMetaData(Class<T> type);
+    /**
+     * Set the databinding-specific metadata
+     * @param type The java type of the metadata
+     * @param metaData the databinding-specific metadata, such as SDO's commonj.sdo.Type or 
+     * JAXB's javax.xml.bind.JAXBContext
+     */
+    <T> void setMetaData(Class<T> type, T metaData);
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/FaultExceptionMapper.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/FaultExceptionMapper.java
new file mode 100644
index 0000000000..70f6d5b403
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/FaultExceptionMapper.java
@@ -0,0 +1,62 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.interfacedef;
+
+/**
+ * This interface represents the mapping between WSDL faults and Java exceptions
+ * 
+ * @version $Rev$ $Date$
+ */
+@SuppressWarnings("unchecked")
+public interface FaultExceptionMapper {
+    /**
+     * Introspect an exception class to find out the fault data type following the WSDL2Java
+     * mapping rules. The result will be populated into the logical type of the exception data
+     * type
+     * 
+     * @param exceptionDataType The data type representing a java exception class
+     * @param operation TODO
+     * @param generatingFaultBean If JAXWS Section 3.7 Fault Bean will be generated
+     * @return true if the introspection can recognize the exception data type 
+     */
+    boolean introspectFaultDataType(DataType<DataType> exceptionDataType, Operation operation, boolean generatingFaultBean);
+    
+    /**
+     * Create a java exception to wrap the fault data
+     * 
+     * @param exceptionType The DataType for the exception
+     * @param message message for the exception
+     * @param faultInfo The fault data
+     * @param cause of the exception
+     * @param operation TODO
+     * @return An instance of java exception to represent the fault
+     */
+    Throwable wrapFaultInfo(DataType<DataType> exceptionType, String message, Object faultInfo, Throwable cause, Operation operation);
+
+    /**
+     * Retrieve the fault info from a java exception
+     * 
+     * @param exception The java exception that represents the fault data
+     * @param faultBeanClass
+     * @param operation TODO
+     * @return The fault data
+     */
+    Object getFaultInfo(Throwable exception, Class<?> faultBeanClass, Operation operation);
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/IncompatibleInterfaceContractException.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/IncompatibleInterfaceContractException.java
new file mode 100644
index 0000000000..179dc1755e
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/IncompatibleInterfaceContractException.java
@@ -0,0 +1,69 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.interfacedef;
+
+/**
+ * Denotes incompatible service contracts for a wire
+ * 
+ * @version $Rev$ $Date$
+ */
+public class IncompatibleInterfaceContractException extends Exception {
+    private static final long serialVersionUID = 5127478601823295587L;
+    private final InterfaceContract source;
+    private final InterfaceContract target;
+    private final Operation sourceOperation;
+    private final Operation targetOperation;
+
+    public IncompatibleInterfaceContractException(String message, InterfaceContract source, InterfaceContract target) {
+        super(message);
+        this.source = source;
+        this.target = target;
+        this.sourceOperation = null;
+        this.targetOperation = null;
+    }
+
+    public IncompatibleInterfaceContractException(String message,
+                                                  InterfaceContract source,
+                                                  InterfaceContract target,
+                                                  Operation sourceOperation,
+                                                  Operation targetOperation) {
+        super(message);
+        this.source = source;
+        this.target = target;
+        this.sourceOperation = sourceOperation;
+        this.targetOperation = targetOperation;
+    }
+
+    public InterfaceContract getTarget() {
+        return target;
+    }
+
+    public InterfaceContract getSource() {
+        return source;
+    }
+
+    public Operation getSourceOperation() {
+        return sourceOperation;
+    }
+
+    public Operation getTargetOperation() {
+        return targetOperation;
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/Interface.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/Interface.java
new file mode 100644
index 0000000000..cab7057b57
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/Interface.java
@@ -0,0 +1,128 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.interfacedef;
+
+import java.util.List;
+import java.util.Map;
+
+import org.apache.tuscany.sca.policy.PolicySubject;
+
+/**
+ * Represents a service interface. This interface will typically be extended to
+ * support concrete interface type systems, such as Java interfaces, WSDL 1.1
+ * portTypes and WSDL 2.0 interfaces.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface Interface extends Cloneable, PolicySubject {
+
+    /**
+     * Returns true if the interface is a remotable interface..
+     *
+     * @return true if the interface is a remotable interface
+     */
+    boolean isRemotable();
+
+    /**
+     * Sets whether the interface is a remotable or local interface.
+     *
+     * @param remotable indicates whether the interface is remotable or local
+     */
+    void setRemotable(boolean remotable);
+    
+    /**
+     * Returns true if the interface remotable property is set..
+     * 
+     * This is used to verify if a @remotable attribute is used in the 
+     * <interface.java> SCDL element. If true, use isRemotable to verify the
+     * current value
+     * 
+     * @return
+     */
+    boolean isRemotableSet();
+
+    // FIXME: [rfeng] We need to re-consider the conversational as an intent
+    /**
+     * Test if the interface is conversational
+     * @return
+     */
+    boolean isConversational();
+
+    /**
+     * Set whether the interface is conversational
+     * @param conversational
+     */
+    void setConversational(boolean conversational);
+
+    /**
+     * Returns the operations defined on this interface.
+     *
+     * @return the operations defined on this interface
+     */
+    List<Operation> getOperations();
+
+    /**
+     * Set the databinding for the interface
+     * @param dataBinding
+     * @deprecated Please use resetDataBinding
+     */
+    @Deprecated
+    void setDefaultDataBinding(String dataBinding);
+
+    /**
+     * Reset the databinding for the interface
+     * @param dataBinding
+     */
+    void resetDataBinding(String dataBinding);
+
+    /**
+     * Set the interface input types by copying those from the
+     * interface provided
+     * 
+     * @param newInterface
+     */
+    public void resetInterfaceInputTypes(Interface newInterface);
+    
+    /**
+     * Set the interface output types by copying those from the
+     * interface provided
+     * 
+     * @param newInterface
+     */
+    public void resetInterfaceOutputTypes(Interface newInterface);
+
+    /**
+     * Returns true if the Interface is dynamic.
+     *
+     * @return true if the Interface is dynamic.
+     */
+    boolean isDynamic();
+
+    /**
+     * Get a map of attributes assoicated with the interface
+     * @return A map of attributes
+     */
+    Map<Object, Object> getAttributes();
+
+    /**
+     * Implementations must support cloning.
+     */
+    Object clone() throws CloneNotSupportedException;
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/InterfaceContract.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/InterfaceContract.java
new file mode 100644
index 0000000000..568a6c595c
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/InterfaceContract.java
@@ -0,0 +1,81 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.interfacedef;
+
+
+/**
+ * Interface contracts define one or more business functions. These business
+ * functions are provided by services and are used by references.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface InterfaceContract extends Cloneable {
+
+    /**
+     * Returns the interface definition representing the interface for
+     * invocations from the requestor to the provider.
+     * 
+     * @return the interface definition representing the interface for
+     *         invocations from the requestor to the provider
+     */
+    Interface getInterface();
+
+    /**
+     * Sets the interface definition representing the interface for invocations
+     * from the requestor to the provider.
+     * 
+     * @param callInterface the interface definition representing the interface
+     *            for invocations from the requestor to the provider
+     */
+    void setInterface(Interface callInterface);
+
+    /**
+     * Returns the interface definition representing the interface for
+     * invocations from the provider to the requestor.
+     * 
+     * @return the interface definition representing the interface for
+     *         invocations from the provider to the requestor.
+     */
+    Interface getCallbackInterface();
+
+    /**
+     * Sets the interface definition representing the interface for invocations
+     * from the provider to the requestor.
+     * 
+     * @param callbackInterface the interface definition representing the
+     *            interface for invocations from the provider to the requestor.
+     */
+    void setCallbackInterface(Interface callbackInterface);
+
+    // FIXME: We need a better way to do this
+    /**
+     * Convert an interface contract to a unidirectional interface contract
+     *  
+     * @param isCallback true for a callback interface contract, false for
+     *        a forward interface contract
+     * @return A unidirectional interface contract, cloned if necessary 
+     */
+    InterfaceContract makeUnidirectional(boolean isCallback);
+
+    /**
+     * Implementations must support cloning.
+     */
+    Object clone() throws CloneNotSupportedException;
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/InterfaceContractMapper.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/InterfaceContractMapper.java
new file mode 100644
index 0000000000..8dfeb29833
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/InterfaceContractMapper.java
@@ -0,0 +1,139 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.interfacedef;
+
+/**
+ * The InterfaceContractMapper is responsible to match interfaces
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface InterfaceContractMapper {
+    /**
+     * Check the compatibility of the source and the target interface contracts.
+     * <p>
+     * A wire may only connect a source to a target if the target implements an
+     * interface that is compatible with the interface required by the source.
+     * The source and the target are compatible if: <p/>
+     * <ol>
+     * <li>the source interface and the target interface MUST either both be
+     * remotable or they are both local
+     * <li>the methods on the target interface MUST be the same as or be a
+     * superset of the methods in the interface specified on the source
+     * <li>compatibility for the individual method is defined as compatibility
+     * of the signature, that is method name, input types, and output types MUST
+     * BE the same.
+     * <li>the order of the input and output types also MUST BE the same.
+     * <li>the set of Faults and Exceptions expected by the source MUST BE the
+     * same or be a superset of those specified by the service.
+     * <li>other specified attributes of the two interfaces MUST match,
+     * including Scope and Callback interface
+     * </ol>
+     * <p/>
+     * <p>
+     * This relationship implies that the source contract is a subset of the target
+     * contract - ie all the operations of the source must be present in the target, but
+     * the target can in principle contain additional operations not present in the 
+     * source
+     * </p>
+     * <p>
+     * Please note this test is not symmetric: the success of isCompatible(A, B)
+     * does NOT imply isCompatible(B, A)
+     * 
+     * @param source The source interface contract
+     * @param target The target interface contract
+     * @return true if the source contract can be supported by the target
+     *         contract
+     */
+    boolean isCompatible(InterfaceContract source, InterfaceContract target);
+    
+    /**
+     * Check that two interface contracts are equal. The contracts are equal if the two contracts have the 
+     * same set of operations, with each operation having the same signature. 
+     * @param source - the source contract
+     * @param target - the target contract
+     * @return
+     */
+    boolean isEqual(InterfaceContract source, InterfaceContract target);
+
+    /**
+     * Check that two interfaces are equal. The interfaces are equal if the two interfaces have the 
+     * same set of operations, with each operation having the same signature. 
+     * @param source an interface
+     * @param target a second interface
+     * @return true if the two interfaces are equal, otherwise return false
+     */
+    public boolean isEqual(Interface source, Interface target);
+    
+    /**
+     * @param source
+     * @param target
+     * @param ignoreCallback
+     * @param silent
+     * @return
+     * @throws IncompatibleInterfaceContractException
+     */
+    boolean checkCompatibility(InterfaceContract source,
+                               InterfaceContract target,
+                               boolean ignoreCallback,
+                               boolean silent) throws IncompatibleInterfaceContractException;
+
+    /**
+     * Test if the source data type is compatible with the target data type. The
+     * compatibility is defined as follows.
+     * <ul>
+     * <li>source's logical type is either the same or subtype of the target's
+     * logical type
+     * </ul>
+     * For example, if the source type is a SDO Customer and the target type is
+     * a JAXB Customer and both Customer are generated from the same XSD type.
+     * 
+     * @param source The source data type
+     * @param target The target data type
+     * @return
+     */
+    boolean isCompatible(DataType<?> source, DataType<?> target, boolean remotable);
+
+    /**
+     * Check if source operation is compatible with the target operation
+     * 
+     * @param source The source operation
+     * @param target The target operation
+     * @return true if the source operation is compatible with the target
+     *         operation
+     */
+    boolean isCompatible(Operation source, Operation target, boolean remotable);
+
+    /**
+     * @param source
+     * @param target
+     * @return
+     */
+    boolean isCompatible(Interface source, Interface target);
+
+    /**
+     * Map the source operation to a compatible operation in the target
+     * interface
+     * 
+     * @param target The target interface
+     * @param source The source operation
+     * @return A compatible operation
+     */
+    Operation map(Interface target, Operation source);
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/InvalidAnnotationException.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/InvalidAnnotationException.java
new file mode 100644
index 0000000000..b24872bf96
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/InvalidAnnotationException.java
@@ -0,0 +1,36 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.interfacedef;
+
+
+public class InvalidAnnotationException extends InvalidInterfaceException {
+
+    private static final long serialVersionUID = 4923028138353415223L;
+    private final Class<?> clazz;
+
+    public InvalidAnnotationException(String message, Class<?> clazz) {
+        super(message);
+        this.clazz = clazz;
+    }
+
+    public Class<?> getAnnotation() {
+        return clazz;
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/InvalidCallbackException.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/InvalidCallbackException.java
new file mode 100644
index 0000000000..f952a86478
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/InvalidCallbackException.java
@@ -0,0 +1,34 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.interfacedef;
+
+
+/**
+ * Denotes an illegal callback interface
+ *
+ * @version $Rev$ $Date$
+ */
+
+public class InvalidCallbackException extends InvalidInterfaceException {
+    private static final long serialVersionUID = 2727755895702116397L;
+
+    public InvalidCallbackException(String message) {
+        super(message);
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/InvalidInterfaceException.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/InvalidInterfaceException.java
new file mode 100644
index 0000000000..2a273c9a26
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/InvalidInterfaceException.java
@@ -0,0 +1,41 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.interfacedef;
+
+/**
+ * @version $Rev$ $Date$
+ */
+public abstract class InvalidInterfaceException extends Exception {
+
+    public InvalidInterfaceException() {
+        super();
+    }
+
+    public InvalidInterfaceException(String message) {
+        super(message);
+    }
+
+    public InvalidInterfaceException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public InvalidInterfaceException(Throwable cause) {
+        super(cause);
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/InvalidOperationException.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/InvalidOperationException.java
new file mode 100644
index 0000000000..b19805c5b1
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/InvalidOperationException.java
@@ -0,0 +1,42 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.interfacedef;
+
+import java.lang.reflect.Method;
+
+/**
+ * Denotes an invalid conversational interface definition
+ * 
+ * @version $Rev$ $Date$
+ */
+public class InvalidOperationException extends InvalidInterfaceException {
+
+    private static final long serialVersionUID = -1797615361821517091L;
+    private final Method operation;
+
+    public InvalidOperationException(String message, Method operation) {
+        super(message);
+        this.operation = operation;
+    }
+
+    public Method getOperation() {
+        return operation;
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/Operation.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/Operation.java
new file mode 100644
index 0000000000..55f00b82c8
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/Operation.java
@@ -0,0 +1,209 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.interfacedef;
+
+import java.util.List;
+import java.util.Map;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.interfacedef.util.WrapperInfo;
+import org.apache.tuscany.sca.interfacedef.util.XMLType;
+import org.apache.tuscany.sca.policy.PolicySubject;
+
+/**
+ * Represents an operation on a service interface.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface Operation extends Cloneable, PolicySubject {
+    /**
+     * Returns the name of the operation.
+     *
+     * @return the name of the operation
+     */
+    String getName();
+
+    /**
+     * Sets the name of the operation.
+     *
+     * @param name the name of the operation
+     */
+    void setName(String name);
+
+    /**
+     * Returns true if the model element is unresolved.
+     *
+     * @return true if the model element is unresolved.
+     */
+    boolean isUnresolved();
+
+    /**
+     * Sets whether the model element is unresolved.
+     *
+     * @param unresolved whether the model element is unresolved
+     */
+    void setUnresolved(boolean unresolved);
+
+    /**
+     * Get the data type that represents the input of this operation. The logic
+     * type is a list of data types and each element represents a parameter
+     *
+     * @return the inputType
+     */
+    DataType<List<DataType>> getInputType();
+
+    /**
+     * @param inputType
+     */
+    void setInputType(DataType<List<DataType>> inputType);
+
+    /**
+     * Get the data type for the output
+     *
+     * @return the outputType
+     */
+    DataType getOutputType();
+
+    /**
+     * @param outputType
+     */
+    void setOutputType(DataType outputType);
+
+    /**
+     * Get a list of data types to represent the faults/exceptions
+     *
+     * @return the faultTypes
+     */
+    List<DataType> getFaultTypes();
+
+    /**
+     * @param faultTypes
+     */
+    void setFaultTypes(List<DataType> faultTypes);
+
+    /**
+     * Get the owning interface
+     * @return
+     */
+    Interface getInterface();
+
+    /**
+     * Set the owning interface
+     * @param interfaze
+     */
+    void setInterface(Interface interfaze);
+
+    /**
+     * Get the sequence of the conversation
+     * @return
+     */
+    ConversationSequence getConversationSequence();
+
+    /**
+     * Set the sequence of conversation for the operation
+     * @param sequence
+     */
+    void setConversationSequence(ConversationSequence sequence);
+
+    /**
+     * Indicate if the operation is non-blocking
+     * @return
+     */
+    boolean isNonBlocking();
+
+    /**
+     * Set the operation to be non-blocking
+     */
+    void setNonBlocking(boolean nonBlocking);
+
+    /**
+     * @return the wrapperInfo
+     */
+    WrapperInfo getWrapper();
+
+    /**
+     * @param wrapperInfo the wrapperInfo to set
+     */
+    void setWrapper(WrapperInfo wrapperInfo);
+
+    /**
+     * @return the wrapperStyle
+     */
+    boolean isWrapperStyle();
+
+    /**
+     * @param wrapperStyle the wrapperStyle to set
+     */
+    void setWrapperStyle(boolean wrapperStyle);
+
+    /**
+     * @deprecated This should be the WrapperInfo.getDataBinding()
+     * Get the databinding for the operation
+     * @return
+     */
+    @Deprecated
+    String getDataBinding();
+
+    /**
+     * @deprecated This should be the WrapperInfo.setDataBinding()
+     * Set the databinding for the operation
+     * @param dataBinding
+     */
+    @Deprecated
+    void setDataBinding(String dataBinding);
+
+    /**
+     * Returns true if the operation is dynamic.
+     *
+     * @return true if the operation is dynamic otherwise false
+     */
+    boolean isDynamic();
+
+    /**
+     * Set if the operation is dynamic
+     * @param b
+     */
+    void setDynamic(boolean b);
+
+    /**
+     * Get the synthesized fault beans for this operation
+     *
+     * @return the fault beans
+     */
+    Map<QName, List<DataType<XMLType>>> getFaultBeans();
+
+    /**
+     * Set the synthesized fault beans for this operation
+     * @param faultBeans
+     */
+    void setFaultBeans(Map<QName, List<DataType<XMLType>>> faultBeans);
+
+    /**
+     * Get a map of attributes assoicated with the operation
+     * @return A map of attributes
+     */
+    Map<Object, Object> getAttributes();
+
+    /**
+     * Implementations must support cloning.
+     */
+    Object clone() throws CloneNotSupportedException;
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/OverloadedOperationException.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/OverloadedOperationException.java
new file mode 100644
index 0000000000..6773b29088
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/OverloadedOperationException.java
@@ -0,0 +1,45 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.interfacedef;
+
+import java.lang.reflect.Method;
+
+/**
+ * Exception thrown to indicate that a service contract specification contains
+ * an overloaded method.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class OverloadedOperationException extends InvalidInterfaceException {
+    private static final long serialVersionUID = -4658711318608885638L;
+    private final Method operation;
+
+    public OverloadedOperationException(Method operation) {
+        super(operation == null ? 
+                null : "Cannot overload operation " + operation.getName() 
+                         + " on " + operation.getDeclaringClass().getName()
+                         + " as it is a @Remotable interface");
+        this.operation = operation;
+    }
+
+    public Method getOperation() {
+        return operation;
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/impl/DataTypeImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/impl/DataTypeImpl.java
new file mode 100644
index 0000000000..c1c8400b71
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/impl/DataTypeImpl.java
@@ -0,0 +1,219 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.interfacedef.impl;
+
+import java.lang.reflect.Type;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.apache.tuscany.sca.interfacedef.DataType;
+
+/**
+ * Representation of the type of data associated with an operation. Data is
+ * represented in two forms: the physical form used by the runtime and a logical
+ * form used by the assembly. The physical form is a Java Type because the
+ * runtime is written in Java. This may be the same form used by the application
+ * but it may not; for example, an application that is performing stream
+ * processing may want a physical form such as an
+ * {@link java.io.InputStream InputStream} to semantially operate on application
+ * data such as a purchase order. The logical description is that used by the
+ * assembly model and is an identifier into some well-known type space; examples
+ * may be a Java type represented by its Class or an XML type represented by its
+ * QName. Every data type may also contain metadata describing the expected
+ * data; for example, it could specify a preferred data binding technology or
+ * the size of a typical instance.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class DataTypeImpl<L> implements DataType<L> {
+    private String dataBinding;
+    private Class<?> physical;
+    private Type genericType;
+    private L logical;
+    private Map<Class<?>, Object> metaDataMap;
+
+    /**
+     * Construct a data type specifying the physical and logical types.
+     * 
+     * @param physical the physical class used by the runtime
+     * @param logical the logical type
+     * @see #getLogical()
+     */
+    public DataTypeImpl(Class<?> physical, L logical) {
+        this(null, physical, physical, logical);
+    }
+
+    /**
+     * @param dataBinding
+     * @param physical
+     * @param logical
+     */
+    public DataTypeImpl(String dataBinding, Class<?> physical, L logical) {
+        this(dataBinding, physical, physical, logical);
+    }
+
+    /**
+     * @param dataBinding
+     * @param physical
+     * @param genericType
+     * @param logical
+     */
+    public DataTypeImpl(String dataBinding, Class<?> physical, Type genericType, L logical) {
+        super();
+        this.dataBinding = dataBinding;
+        this.physical = physical;
+        this.genericType = genericType;
+        this.logical = logical;
+    }
+
+    /**
+     * Returns the physical type used by the runtime.
+     * 
+     * @return the physical type used by the runtime
+     */
+    public Class<?> getPhysical() {
+        return physical;
+    }
+
+    /**
+     * @param physical the physical to set
+     */
+    public void setPhysical(Class<?> physical) {
+        this.physical = physical;
+    }
+
+    /**
+     * Get the java generic type
+     * @return The java generic type
+     */
+    public Type getGenericType() {
+        return genericType;
+    }
+
+    /**
+     * Set the java generic type
+     * @param genericType
+     */
+    public void setGenericType(Type genericType) {
+        this.genericType = genericType;
+    }
+
+    /**
+     * Returns the logical identifier used by the assembly. The type of this
+     * value identifies the logical type system in use. Known values are:
+     * <ul>
+     * <li>a java.lang.reflect.Type identifies a Java type by name and
+     * ClassLoader; this includes Java Classes as they are specializations of
+     * Type</li>
+     * <li>a javax.xml.namespace.QName identifies an XML type by local name and
+     * namespace</li>
+     * </ul>
+     * 
+     * @return the logical type name
+     */
+    public L getLogical() {
+        return logical;
+    }
+
+    /**
+     * @param logical the logical to set
+     */
+    public void setLogical(L logical) {
+        this.logical = logical;
+    }
+
+    public String getDataBinding() {
+        return dataBinding;
+    }
+
+    /**
+     * @param dataBinding the dataBinding to set
+     */
+    public void setDataBinding(String dataBinding) {
+        this.dataBinding = dataBinding;
+    }
+
+    @Override
+    public String toString() {
+        StringBuffer sb = new StringBuffer();
+        sb.append(physical).append(" ").append(dataBinding).append(" ").append(logical);
+        return sb.toString();
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public Object clone() throws CloneNotSupportedException {
+        DataTypeImpl copy = (DataTypeImpl)super.clone();
+        return copy;
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((dataBinding == null) ? 0 : dataBinding.hashCode());
+        result = prime * result + ((genericType == null) ? 0 : genericType.hashCode());
+        result = prime * result + ((logical == null) ? 0 : logical.hashCode());
+        result = prime * result + ((physical == null) ? 0 : physical.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        final DataTypeImpl other = (DataTypeImpl)obj;
+        if (dataBinding == null) {
+            if (other.dataBinding != null)
+                return false;
+        } else if (!dataBinding.equals(other.dataBinding))
+            return false;
+        if (genericType == null) {
+            if (other.genericType != null)
+                return false;
+        } else if (!genericType.equals(other.genericType))
+            return false;
+        if (logical == null) {
+            if (other.logical != null)
+                return false;
+        } else if (!logical.equals(other.logical))
+            return false;
+        if (physical == null) {
+            if (other.physical != null)
+                return false;
+        } else if (!physical.equals(other.physical))
+            return false;
+        return true;
+    }
+
+    public <T> T getMetaData(Class<T> type) {
+        return metaDataMap == null ? null : type.cast(metaDataMap.get(type));
+    }
+
+    public <T> void setMetaData(Class<T> type, T metaData) {
+        if (metaDataMap == null) {
+            metaDataMap = new ConcurrentHashMap<Class<?>, Object>();
+        }
+        metaDataMap.put(type, metaData);
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/impl/InterfaceContractImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/impl/InterfaceContractImpl.java
new file mode 100644
index 0000000000..15581b5e04
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/impl/InterfaceContractImpl.java
@@ -0,0 +1,128 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.interfacedef.impl;
+
+import org.apache.tuscany.sca.interfacedef.Interface;
+import org.apache.tuscany.sca.interfacedef.InterfaceContract;
+
+/**
+ * Represents an interface contract. InterfaceContractImpl
+ * 
+ * @version $Rev$ $Date$
+ */
+public abstract class InterfaceContractImpl implements InterfaceContract {
+    private Interface callInterface;
+    private Interface callbackInterface;
+
+    public Interface getCallbackInterface() {
+        return callbackInterface;
+    }
+
+    public Interface getInterface() {
+        return callInterface;
+    }
+
+    public void setCallbackInterface(Interface callbackInterface) {
+        this.callbackInterface = callbackInterface;
+    }
+
+    public void setInterface(Interface callInterface) {
+        this.callInterface = callInterface;
+    }
+
+    public InterfaceContract makeUnidirectional(boolean isCallback) {
+        if (!isCallback && callbackInterface == null)
+            return this; // already a unidirectional forward interface contract
+
+        if (isCallback && callInterface == null)
+            return this; // already a unidirectional callback interface contract
+
+        // contract is bidirectional, so create a new unidirectional contract        
+        try {
+            InterfaceContract newContract = clone();
+            if (!isCallback) {
+                newContract.setCallbackInterface(null); // create unidirectional forward interface contract
+            } else {
+                newContract.setInterface(null); // create unidirectional callback interface contract
+            }
+            return newContract;
+        } catch (CloneNotSupportedException e) {
+            // will not happen
+            return null;
+        }
+    }
+
+    @Override
+    public InterfaceContractImpl clone() throws CloneNotSupportedException {
+        InterfaceContractImpl copy = (InterfaceContractImpl)super.clone();
+        if (this.callbackInterface != null) {
+            copy.callbackInterface = (Interface)this.callbackInterface.clone();
+        }
+        if (this.callInterface != null) {
+            copy.callInterface = (Interface)this.callInterface.clone();
+        }
+        return copy;
+    }
+
+    /**
+     * @see java.lang.Object#hashCode()
+     */
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((callInterface == null) ? 0 : callInterface.hashCode());
+        result = prime * result + ((callbackInterface == null) ? 0 : callbackInterface.hashCode());
+        return result;
+    }
+
+    /**
+     * @see java.lang.Object#equals(java.lang.Object)
+     */
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        final InterfaceContractImpl other = (InterfaceContractImpl)obj;
+        if (callInterface == null) {
+            if (other.callInterface != null) {
+                return false;
+            }
+        } else if (!callInterface.equals(other.callInterface)) {
+            return false;
+        }
+        if (callbackInterface == null) {
+            if (other.callbackInterface != null) {
+                return false;
+            }
+        } else if (!callbackInterface.equals(other.callbackInterface)) {
+            return false;
+        }
+        return true;
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/impl/InterfaceContractMapperImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/impl/InterfaceContractMapperImpl.java
new file mode 100644
index 0000000000..289fd25594
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/impl/InterfaceContractMapperImpl.java
@@ -0,0 +1,390 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.tuscany.sca.interfacedef.impl;
+
+import java.util.List;
+
+import org.apache.tuscany.sca.interfacedef.DataType;
+import org.apache.tuscany.sca.interfacedef.IncompatibleInterfaceContractException;
+import org.apache.tuscany.sca.interfacedef.Interface;
+import org.apache.tuscany.sca.interfacedef.InterfaceContract;
+import org.apache.tuscany.sca.interfacedef.InterfaceContractMapper;
+import org.apache.tuscany.sca.interfacedef.Operation;
+
+/**
+ * @version $Rev$ $Date$
+ */
+public class InterfaceContractMapperImpl implements InterfaceContractMapper {
+
+    public boolean isCompatible(DataType source, DataType target, boolean remotable) {
+        if (source == target) {
+            return true;
+        }
+        if (!remotable) {
+            if (source == null || target == null) {
+                return false;
+            }
+            // For local case
+            return target.getPhysical().isAssignableFrom(source.getPhysical());
+        } else {
+            // FIXME: How to test if two remotable data type is compatible?
+            // return target.getLogical().equals(source.getLogical());
+            return true;
+        }
+
+    }
+    
+
+    /**
+     * Check that two interface contracts are equal. The contracts are equal if the two contracts have the 
+     * same set of operations, with each operation having the same signature, both for forward and callback
+     * interfaces
+     * @param source
+     * @param target
+     * @return
+     */
+    public boolean isEqual(InterfaceContract source, InterfaceContract target) {
+    	// Are the forward interfaces equal?
+    	if( isEqual( source.getInterface(), target.getInterface()) ) {
+    		// Is there a Callback interface?
+    		if( source.getCallbackInterface() == null && target.getCallbackInterface() == null ) {
+    			return true;
+    		} else {
+    			if( isEqual( source.getCallbackInterface(), target.getCallbackInterface()) ) {
+    				return true;
+    			} // end if
+    		} // end if
+    	} // end if
+    	return false;
+    } // end method isEqual
+    
+    /**
+     * Check that two interfaces are equal. The interfaces are equal if the two interfaces have the 
+     * same set of operations, with each operation having the same signature. 
+     * @param source
+     * @param target
+     * @return
+     */
+    public boolean isEqual(Interface source, Interface target) {
+        if (source == target) {
+            // Shortcut for performance
+            return true;
+        } // end if
+        if (source == null || target == null) {
+       		return false;
+        } // end if
+
+        if (source.isDynamic() || target.isDynamic()) {
+            return true;
+        }
+
+        if (source.isRemotable() != target.isRemotable()) {
+            return false;
+        }
+        if (source.isConversational() != target.isConversational()) {
+            return false;
+        }
+        if( source.getOperations().size() != target.getOperations().size() ) {
+        	return false;
+        }
+
+        for (Operation operation : source.getOperations()) {
+            Operation targetOperation = getOperation(target.getOperations(), operation.getName());
+            if (targetOperation == null) {
+                return false;
+            }
+            if (!isCompatible(operation, targetOperation, source.isRemotable())) {
+                return false;
+            }
+        }
+        return true;
+    } // end method isEqual
+
+    public boolean isCompatible(Operation source, Operation target, boolean remotable) {
+        if (source == target) {
+            return true;
+        }
+
+        if (source.isDynamic() || target.isDynamic()) {
+            return true;
+        }
+
+        // Check name
+        if (!source.getName().equals(target.getName())) {
+            return false;
+        }
+
+        if (source.getInterface().isRemotable() != target.getInterface().isRemotable()) {
+            return false;
+        }
+
+        //        if (source.getInterface().isRemotable()) {
+        //            return true;
+        //        }
+
+        // FIXME: We need to deal with wrapped<-->unwrapped conversion
+
+        // Check output type
+        DataType<?> sourceOutputType = source.getOutputType();
+        DataType<?> targetOutputType = target.getOutputType();
+
+        boolean checkSourceWrapper = true;
+        List<DataType> sourceInputType = source.getInputType().getLogical();
+        if (source.isWrapperStyle() && source.getWrapper() != null) {
+            sourceInputType = source.getWrapper().getUnwrappedInputType().getLogical();
+            sourceOutputType = source.getWrapper().getUnwrappedOutputType();
+            checkSourceWrapper = false;
+        }
+        boolean checkTargetWrapper = true;
+        List<DataType> targetInputType = target.getInputType().getLogical();
+        if (target.isWrapperStyle() && target.getWrapper() != null) {
+            targetInputType = target.getWrapper().getUnwrappedInputType().getLogical();
+            targetOutputType = target.getWrapper().getUnwrappedOutputType();
+            checkTargetWrapper = false;
+        }
+
+        if (checkSourceWrapper != checkTargetWrapper) {
+            return true;
+        }
+
+        if (!isCompatible(targetOutputType, sourceOutputType, remotable)) {
+            return false;
+        }
+
+        if (sourceInputType.size() != targetInputType.size()) {
+            return false;
+        }
+
+        int size = sourceInputType.size();
+        for (int i = 0; i < size; i++) {
+            if (!isCompatible(sourceInputType.get(i), targetInputType.get(i), remotable)) {
+                return false;
+            }
+        }
+
+        // Check fault types
+        for (DataType targetFaultType : target.getFaultTypes()) {
+            // Source fault types must be the same or superset of target fault
+            // types
+            boolean found = true;
+            for (DataType sourceFaultType : source.getFaultTypes()) {
+                found = false;
+                if (isCompatible(targetFaultType, sourceFaultType, remotable)) {
+                    // Target fault type can be covered by the source fault type
+                    found = true;
+                    break;
+                }
+            }
+            if (!found) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    // FIXME: How to improve the performance for the lookup
+    private Operation getOperation(List<Operation> operations, String name) {
+        for (Operation op : operations) {
+            if (op.getName().equals(name)) {
+                return op;
+            }
+        }
+        return null;
+    }
+
+    public boolean checkCompatibility(InterfaceContract source,
+                                      InterfaceContract target,
+                                      boolean ignoreCallback,
+                                      boolean silent) throws IncompatibleInterfaceContractException {
+        if (source == target) {
+            // Shortcut for performance
+            return true;
+        }
+        
+        if (source == null || target == null){
+            return false;
+        }
+        
+        if (source.getInterface() == target.getInterface()){
+            return true;
+        }
+        
+        if (source.getInterface() == null || target.getInterface() == null){
+            return false;
+        }
+
+        if (source.getInterface().isDynamic() || target.getInterface().isDynamic()) {
+            return true;
+        }
+
+        if (source.getInterface().isRemotable() != target.getInterface().isRemotable()) {
+            if (!silent) {
+                throw new IncompatibleInterfaceContractException("Remotable settings do not match", source, target);
+            } else {
+                return false;
+            }
+        }
+        if (source.getInterface().isConversational() != target.getInterface().isConversational()) {
+            if (!silent) {
+                throw new IncompatibleInterfaceContractException("Interaction scopes do not match", source, target);
+            } else {
+                return false;
+            }
+        }
+
+        for (Operation operation : source.getInterface().getOperations()) {
+            Operation targetOperation = map(target.getInterface(), operation);
+            if (targetOperation == null) {
+                if (!silent) {
+                    throw new IncompatibleInterfaceContractException("Operation not found on target", source, target);
+                } else {
+                    return false;
+                }
+            }
+            if (!source.getInterface().isRemotable()) {
+                // FIXME: for remotable operation, only compare name for now
+                if (!isCompatible(operation, targetOperation, false)) {
+                    if (!silent) {
+                        throw new IncompatibleInterfaceContractException("Target operations are not compatible",
+                                                                         source, target);
+                    } else {
+                        return false;
+                    }
+                }
+            }
+        }
+
+        if (ignoreCallback) {
+            return true;
+        }
+
+        if (source.getCallbackInterface() == null && target.getCallbackInterface() == null) {
+            return true;
+        }
+        if (source.getCallbackInterface() == null || target.getCallbackInterface() == null) {
+            if (!silent) {
+                throw new IncompatibleInterfaceContractException("Callback interface doesn't match", source, target);
+            } else {
+                return false;
+            }
+        }
+
+        if (source.getCallbackInterface().isConversational() != target.getCallbackInterface().isConversational()) {
+            if (!silent) {
+                throw new IncompatibleInterfaceContractException("Interaction scopes do not match", source, target);
+            } else {
+                return false;
+            }
+        }
+
+        for (Operation operation : source.getCallbackInterface().getOperations()) {
+            Operation targetOperation =
+                getOperation(target.getCallbackInterface().getOperations(), operation.getName());
+            if (targetOperation == null) {
+                if (!silent) {
+                    throw new IncompatibleInterfaceContractException("Callback operation not found on target", source,
+                                                                     target, null, targetOperation);
+                } else {
+                    return false;
+                }
+            }
+            if (!source.getCallbackInterface().isRemotable()) {
+                // FIXME: for remotable operation, only compare name for now
+                if (!operation.equals(targetOperation)) {
+                    if (!silent) {
+                        throw new IncompatibleInterfaceContractException("Target callback operation is not compatible",
+                                                                         source, target, operation, targetOperation);
+                    } else {
+                        return false;
+                    }
+                }
+            }
+        }
+        return true;
+    }
+
+    public boolean isCompatible(Interface source, Interface target) {
+        if (source == target) {
+            // Shortcut for performance
+            return true;
+        }
+        if (source == null || target == null) {
+            return false;
+        }
+
+        if (source.isDynamic() || target.isDynamic()) {
+            return true;
+        }
+
+        if (source.isRemotable() != target.isRemotable()) {
+            return false;
+        }
+        if (source.isConversational() != target.isConversational()) {
+            return false;
+        }
+
+        for (Operation operation : source.getOperations()) {
+            Operation targetOperation = getOperation(target.getOperations(), operation.getName());
+            if (targetOperation == null) {
+                return false;
+            }
+            if (!isCompatible(operation, targetOperation, source.isRemotable())) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    public boolean isCompatible(InterfaceContract source, InterfaceContract target) {
+        try {
+            return checkCompatibility(source, target, false, false);
+        } catch (IncompatibleInterfaceContractException e) {
+            return false;
+        }
+    }
+
+    /**
+     * @see org.apache.tuscany.sca.interfacedef.InterfaceContractMapper#map(org.apache.tuscany.sca.interfacedef.Interface,
+     *      org.apache.tuscany.sca.interfacedef.Operation)
+     */
+    public Operation map(Interface target, Operation source) {
+        // TODO: How to handle the case that source operation is dynamic?
+        if (target == null || target.isDynamic()) {
+            return source;
+        } else if (target.isRemotable()) {
+            for (Operation op : target.getOperations()) {
+                if (op.getName().equals(source.getName())) {
+                    return op;
+                }
+            }
+            return null;
+        } else {
+            for (Operation op : target.getOperations()) {
+                if (isCompatible(source, op, target.isRemotable())) {
+                    return op;
+                }
+            }
+            return null;
+        }
+
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/impl/InterfaceImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/impl/InterfaceImpl.java
new file mode 100644
index 0000000000..08f859fc8a
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/impl/InterfaceImpl.java
@@ -0,0 +1,328 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.interfacedef.impl;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.apache.tuscany.sca.interfacedef.DataType;
+import org.apache.tuscany.sca.interfacedef.Interface;
+import org.apache.tuscany.sca.interfacedef.Operation;
+import org.apache.tuscany.sca.interfacedef.util.WrapperInfo;
+import org.apache.tuscany.sca.policy.ExtensionType;
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.PolicySet;
+
+/**
+ * Represents a service interface.
+ *
+ * @version $Rev$ $Date$
+ */
+public class InterfaceImpl implements Interface {
+
+    private Boolean remotable;
+    private boolean conversational;
+    private OperationList operations = new OperationList();
+    private boolean unresolved;
+
+    private ExtensionType type;
+    private List<PolicySet> policySets = new ArrayList<PolicySet>();
+    private List<Intent> requiredIntents = new ArrayList<Intent>();
+    private Map<Object, Object> attributes = new ConcurrentHashMap<Object, Object>();
+
+    public boolean isRemotable() {
+        boolean value = false;
+        if (remotable != null && remotable.booleanValue()) {
+            value = true;
+        }
+        return value;
+    }
+
+    public void setRemotable(boolean remotable) {
+        this.remotable = Boolean.valueOf(remotable);
+    }
+    
+    public boolean isRemotableSet() {
+        return remotable == null ? false : true;
+    }
+
+    public List<Operation> getOperations() {
+        return operations;
+    }
+
+    public boolean isUnresolved() {
+        return unresolved;
+    }
+
+    public void setUnresolved(boolean undefined) {
+        this.unresolved = undefined;
+    }
+
+    /**
+     * @return the conversational
+     */
+    public boolean isConversational() {
+        return conversational;
+    }
+
+    /**
+     * @param conversational the conversational to set
+     */
+    public void setConversational(boolean conversational) {
+        this.conversational = conversational;
+    }
+
+    private class OperationList extends ArrayList<Operation> {
+        private static final long serialVersionUID = -903469106307606099L;
+
+        @Override
+        public Operation set(int index, Operation element) {
+            element.setInterface(InterfaceImpl.this);
+            return super.set(index, element);
+        }
+
+        @Override
+        public void add(int index, Operation element) {
+            element.setInterface(InterfaceImpl.this);
+            super.add(index, element);
+        }
+
+        @Override
+        public boolean add(Operation o) {
+            o.setInterface(InterfaceImpl.this);
+            return super.add(o);
+        }
+
+        @Override
+        public boolean addAll(Collection<? extends Operation> c) {
+            for (Operation op : c) {
+                op.setInterface(InterfaceImpl.this);
+            }
+            return super.addAll(c);
+        }
+
+        @Override
+        public boolean addAll(int index, Collection<? extends Operation> c) {
+            for (Operation op : c) {
+                op.setInterface(InterfaceImpl.this);
+            }
+            return super.addAll(index, c);
+        }
+
+    }
+
+    @Deprecated
+    public void setDefaultDataBinding(String dataBinding) {
+        for (Operation op : getOperations()) {
+            if (op.getDataBinding() == null) {
+                op.setDataBinding(dataBinding);
+                DataType<List<DataType>> inputType = op.getInputType();
+                if (inputType != null) {
+                    for (DataType d : inputType.getLogical()) {
+                        if (d.getDataBinding() == null) {
+                            d.setDataBinding(dataBinding);
+                        }
+                    }
+                }
+                DataType outputType = op.getOutputType();
+                if (outputType != null && outputType.getDataBinding() == null) {
+                    outputType.setDataBinding(dataBinding);
+                }
+                List<DataType> faultTypes = op.getFaultTypes();
+                if (faultTypes != null) {
+                    for (DataType d : faultTypes) {
+                        if (d.getDataBinding() == null) {
+                            d.setDataBinding(dataBinding);
+                        }
+                        DataType ft = (DataType) d.getLogical();
+                        if (ft.getDataBinding() == null) {
+                            ft.setDataBinding(dataBinding);
+                        }
+
+                    }
+                }
+                if (op.isWrapperStyle()) {
+                    WrapperInfo wrapper = op.getWrapper();
+                    if (wrapper != null) {
+                        DataType<List<DataType>> unwrappedInputType = wrapper.getUnwrappedInputType();
+                        if (unwrappedInputType != null) {
+                            for (DataType d : unwrappedInputType.getLogical()) {
+                                if (d.getDataBinding() == null) {
+                                    d.setDataBinding(dataBinding);
+                                }
+                            }
+                        }
+                        DataType unwrappedOutputType = wrapper.getUnwrappedOutputType();
+                        if (unwrappedOutputType != null && unwrappedOutputType.getDataBinding() == null) {
+                            unwrappedOutputType.setDataBinding(dataBinding);
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    private void setDataBinding(DataType dataType, String dataBinding) {
+        if ("java:array".equals(dataType.getDataBinding())) {
+            setDataBinding((DataType)dataType.getLogical(), dataBinding);
+        } else {
+            dataType.setDataBinding(dataBinding);
+        }
+    }
+
+    public void resetDataBinding(String dataBinding) {
+        for (Operation op : getOperations()) {
+            op.setDataBinding(dataBinding);
+            DataType<List<DataType>> inputType = op.getInputType();
+            if (inputType != null) {
+                for (DataType d : inputType.getLogical()) {
+                    setDataBinding(d, dataBinding);
+                }
+            }
+            DataType outputType = op.getOutputType();
+            if (outputType != null) {
+                setDataBinding(outputType, dataBinding);
+            }
+            List<DataType> faultTypes = op.getFaultTypes();
+            if (faultTypes != null) {
+                for (DataType d : faultTypes) {
+                    setDataBinding(d, dataBinding);
+                    setDataBinding((DataType) d.getLogical(), dataBinding);
+                }
+            }
+            if (op.isWrapperStyle()) {
+                WrapperInfo wrapper = op.getWrapper();
+                if (wrapper != null) {
+                    DataType<List<DataType>> unwrappedInputType = wrapper.getUnwrappedInputType();
+                    if (unwrappedInputType != null) {
+                        for (DataType d : unwrappedInputType.getLogical()) {
+                            setDataBinding(d, dataBinding);
+                        }
+                    }
+                    DataType unwrappedOutputType = wrapper.getUnwrappedOutputType();
+                    if (unwrappedOutputType != null) {
+                        setDataBinding(unwrappedOutputType, dataBinding);
+                    }
+                }
+            }
+        }
+    }
+
+    public void resetInterfaceInputTypes(Interface newInterface){
+        for (int i = 0; i < getOperations().size(); i++) {
+            // only remote interfaces only have a data type model defined
+            // and in this case operations cannot be overloaded so match
+            // operations by name
+            Operation oldOperation = getOperations().get(i);
+            Operation newOperation = null;
+
+            for (Operation tmpOperation : newInterface.getOperations()){
+                if (tmpOperation.getName().equals(oldOperation.getName())){
+                    newOperation = tmpOperation;
+                }
+            }
+
+            if (newOperation == null){
+                break;
+            }
+
+            // set input types
+            oldOperation.setInputType(newOperation.getInputType());
+
+            // set wrapper
+            if (newOperation.isWrapperStyle()) {
+                oldOperation.setWrapperStyle(true);
+                oldOperation.setWrapper(newOperation.getWrapper());
+            }
+        }
+    }
+
+    public void resetInterfaceOutputTypes(Interface newInterface){
+        for (int i = 0; i < getOperations().size(); i++) {
+            // only remote interfaces only have a data type model defined
+            // and in this case operations cannot be overloaded so match
+            // operations by name
+            Operation oldOperation = getOperations().get(i);
+            Operation newOperation = null;
+
+            for (Operation tmpOperation : newInterface.getOperations()){
+                if (tmpOperation.getName().equals(oldOperation.getName())){
+                    newOperation = tmpOperation;
+                }
+            }
+
+            if (newOperation == null){
+                break;
+            }
+
+            // set output types
+            oldOperation.setOutputType(newOperation.getOutputType());
+
+            // set fault types
+            oldOperation.setFaultTypes(newOperation.getFaultTypes());
+
+            // set wrapper
+            if (newOperation.isWrapperStyle()) {
+                oldOperation.setWrapperStyle(true);
+                oldOperation.setWrapper(newOperation.getWrapper());
+            }
+        }
+    }
+
+    public boolean isDynamic() {
+        return false;
+    }
+
+    public List<PolicySet> getPolicySets() {
+        return policySets;
+    }
+
+    public List<Intent> getRequiredIntents() {
+        return requiredIntents;
+    }
+
+    public ExtensionType getExtensionType() {
+        return type;
+    }
+
+    public void setExtensionType(ExtensionType type) {
+        this.type = type;
+    }
+
+    @Override
+    public Object clone() throws CloneNotSupportedException {
+        InterfaceImpl copy = (InterfaceImpl)super.clone();
+        copy.operations = new OperationList();
+        for (Operation operation : this.operations) {
+            Operation clonedOperation = (Operation)operation.clone();
+            copy.operations.add(clonedOperation);
+        }
+        copy.attributes = new ConcurrentHashMap<Object, Object>();
+        copy.attributes.putAll(attributes);
+        return copy;
+    }
+
+    public Map<Object, Object> getAttributes() {
+        return attributes;
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/impl/OperationImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/impl/OperationImpl.java
new file mode 100644
index 0000000000..26144e92cb
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/impl/OperationImpl.java
@@ -0,0 +1,284 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.interfacedef.impl;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.interfacedef.ConversationSequence;
+import org.apache.tuscany.sca.interfacedef.DataType;
+import org.apache.tuscany.sca.interfacedef.Interface;
+import org.apache.tuscany.sca.interfacedef.Operation;
+import org.apache.tuscany.sca.interfacedef.util.WrapperInfo;
+import org.apache.tuscany.sca.interfacedef.util.XMLType;
+import org.apache.tuscany.sca.policy.ExtensionType;
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.PolicySet;
+
+/**
+ * Represents an operation on a service interface.
+ *
+ * @version $Rev$ $Date$
+ */
+public class OperationImpl implements Operation {
+
+    private String name;
+    private boolean unresolved;
+    private DataType outputType;
+    private DataType<List<DataType>> inputType;
+    private List<DataType> faultTypes;
+    private Interface interfaze;
+    private ConversationSequence conversationSequence = ConversationSequence.CONVERSATION_NONE;
+    private boolean nonBlocking;
+    private boolean wrapperStyle;
+    private WrapperInfo wrapper;
+    private boolean dynamic;
+
+    private Map<Object, Object> attributes = new ConcurrentHashMap<Object, Object>();
+
+    private Map<QName, List<DataType<XMLType>>> faultBeans;
+
+    private List<PolicySet> applicablePolicySets = new ArrayList<PolicySet>();
+    private List<PolicySet> policySets = new ArrayList<PolicySet>();
+    private List<Intent> requiredIntents = new ArrayList<Intent>();
+    private ExtensionType type;
+
+    /**
+     * @param name
+     */
+    public OperationImpl() {
+        inputType = new DataTypeImpl<List<DataType>>("idl:input", Object[].class, new ArrayList<DataType>());
+        faultTypes = new ArrayList<DataType>();
+        faultBeans = new HashMap<QName, List<DataType<XMLType>>>();
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public boolean isUnresolved() {
+        return unresolved;
+    }
+
+    public void setUnresolved(boolean undefined) {
+        this.unresolved = undefined;
+    }
+
+    /**
+     * @return the faultTypes
+     */
+    public List<DataType> getFaultTypes() {
+        return faultTypes;
+    }
+
+    /**
+     * @param faultTypes the faultTypes to set
+     */
+    public void setFaultTypes(List<DataType> faultTypes) {
+        this.faultTypes = faultTypes;
+    }
+
+    /**
+     * @return the inputType
+     */
+    public DataType<List<DataType>> getInputType() {
+        return inputType;
+    }
+
+    /**
+     * @param inputType the inputType to set
+     */
+    public void setInputType(DataType<List<DataType>> inputType) {
+        this.inputType = inputType;
+    }
+
+    /**
+     * @return the outputType
+     */
+    public DataType getOutputType() {
+        return outputType;
+    }
+
+    /**
+     * @param outputType the outputType to set
+     */
+    public void setOutputType(DataType outputType) {
+        this.outputType = outputType;
+    }
+
+    /**
+     * @return the interface
+     */
+    public Interface getInterface() {
+        return interfaze;
+    }
+
+    /**
+     * @param interfaze the interface to set
+     */
+    public void setInterface(Interface interfaze) {
+        this.interfaze = interfaze;
+    }
+
+    /**
+     * @return the conversationSequence
+     */
+    public ConversationSequence getConversationSequence() {
+        return conversationSequence;
+    }
+
+    /**
+     * @param conversationSequence the conversationSequence to set
+     */
+    public void setConversationSequence(ConversationSequence conversationSequence) {
+        this.conversationSequence = conversationSequence;
+    }
+
+    /**
+     * @return the nonBlocking
+     */
+    public boolean isNonBlocking() {
+        return nonBlocking;
+    }
+
+    /**
+     * @param nonBlocking the nonBlocking to set
+     */
+    public void setNonBlocking(boolean nonBlocking) {
+        this.nonBlocking = nonBlocking;
+    }
+
+    /**
+     * @return the wrapperInfo
+     */
+    public WrapperInfo getWrapper() {
+        return wrapper;
+    }
+
+    /**
+     * @param wrapperInfo the wrapperInfo to set
+     */
+    public void setWrapper(WrapperInfo wrapperInfo) {
+        this.wrapper = wrapperInfo;
+    }
+
+    /**
+     * @return the wrapperStyle
+     */
+    public boolean isWrapperStyle() {
+        return wrapperStyle;
+    }
+
+    /**
+     * @param wrapperStyle the wrapperStyle to set
+     */
+    public void setWrapperStyle(boolean wrapperStyle) {
+        this.wrapperStyle = wrapperStyle;
+    }
+
+    public String getDataBinding() {
+        return wrapper != null ? wrapper.getDataBinding() : null;
+    }
+
+    public void setDataBinding(String dataBinding) {
+        if (wrapper != null) {
+            wrapper.setDataBinding(dataBinding);
+        }
+    }
+
+    public boolean isDynamic() {
+        return dynamic;
+    }
+
+    public void setDynamic(boolean b) {
+        this.dynamic = b;
+    }
+
+    public Map<QName, List<DataType<XMLType>>> getFaultBeans() {
+        return faultBeans;
+    }
+
+    public void setFaultBeans(Map<QName, List<DataType<XMLType>>> faultBeans) {
+        this.faultBeans = faultBeans;
+    }
+
+    @Override
+    public OperationImpl clone() throws CloneNotSupportedException {
+        OperationImpl copy = (OperationImpl) super.clone();
+
+        final List<DataType> clonedFaultTypes = new ArrayList<DataType>(this.faultTypes.size());
+        for (DataType t : this.faultTypes) {
+            clonedFaultTypes.add((DataType) t.clone());
+        }
+        copy.faultTypes = clonedFaultTypes;
+
+        List<DataType> clonedLogicalTypes = new ArrayList<DataType>();
+        for (DataType t : inputType.getLogical()) {
+            DataType type = (DataType) t.clone();
+            clonedLogicalTypes.add(type);
+        }
+        DataType<List<DataType>> clonedInputType =
+            new DataTypeImpl<List<DataType>>(inputType.getPhysical(), clonedLogicalTypes);
+        clonedInputType.setDataBinding(inputType.getDataBinding());
+        copy.inputType = clonedInputType;
+
+        if (this.outputType != null) {
+            copy.outputType = (DataType) this.outputType.clone();
+        }
+
+        copy.attributes = new ConcurrentHashMap<Object, Object>();
+        copy.attributes.putAll(attributes);
+
+        return copy;
+    }
+
+    public List<PolicySet> getApplicablePolicySets() {
+        return applicablePolicySets;
+    }
+
+    public List<PolicySet> getPolicySets() {
+        return policySets;
+    }
+
+    public List<Intent> getRequiredIntents() {
+        return requiredIntents;
+    }
+
+    public ExtensionType getExtensionType() {
+        return type;
+    }
+
+    public void setExtensionType(ExtensionType type) {
+        this.type = type;
+    }
+
+    public Map<Object, Object> getAttributes() {
+        return attributes;
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/util/ElementInfo.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/util/ElementInfo.java
new file mode 100644
index 0000000000..777fa567f1
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/util/ElementInfo.java
@@ -0,0 +1,114 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.interfacedef.util;
+
+import javax.xml.namespace.QName;
+
+/**
+ * An abstraction of XML schema elements.
+ *
+ * @version $Rev$ $Date$
+ */
+public class ElementInfo {
+    private final QName name;
+    private final TypeInfo type;
+    private boolean many = false;
+    private boolean nillable = false;
+
+    /**
+     * @param name
+     * @param type
+     */
+    public ElementInfo(QName name, TypeInfo type) {
+        super();
+        this.name = name;
+        this.type = type;
+    }
+
+    /**
+     * @return the name
+     */
+    public QName getQName() {
+        return name;
+    }
+
+    /**
+     * @return the type
+     */
+    public TypeInfo getType() {
+        return type;
+    }
+
+    @Override
+    public String toString() {
+        StringBuffer sb = new StringBuffer();
+        sb.append("Element: ").append(name).append(" ").append(type);
+        return sb.toString();
+    }
+
+    public boolean isMany() {
+        return many;
+    }
+
+    public void setMany(boolean many) {
+        this.many = many;
+    }
+
+    public boolean isNillable() {
+        return nillable;
+    }
+
+    public void setNillable(boolean nillable) {
+        this.nillable = nillable;
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((name == null) ? 0 : name.hashCode());
+        result = prime * result + ((type == null) ? 0 : type.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        final ElementInfo other = (ElementInfo)obj;
+        if (name == null) {
+            if (other.name != null)
+                return false;
+        } else if (!name.equals(other.name))
+            return false;
+        /*
+        if (type == null) {
+            if (other.type != null)
+                return false;
+        } else if (!type.equals(other.type))
+            return false;
+        */    
+        return true;
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/util/FaultException.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/util/FaultException.java
new file mode 100644
index 0000000000..844b0af509
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/util/FaultException.java
@@ -0,0 +1,82 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.interfacedef.util;
+
+import javax.xml.namespace.QName;
+
+/**
+ * The generic java exception to wrap service faults
+ * 
+ * @version $Rev$ $Date$
+ */
+public class FaultException extends Exception {
+    private static final long serialVersionUID = -8002583655240625792L;
+    private transient Object faultInfo; // FIXME: How to serialize it?
+    private QName faultName;
+
+    /**
+     * @param message
+     * @param faultInfo
+     */
+    public FaultException(String message, Object faultInfo) {
+        super(message);
+        this.faultInfo = faultInfo;
+    }
+
+    /**
+     * @param message
+     * @param faultInfo
+     * @param cause
+     */
+    public FaultException(String message, Object faultInfo, Throwable cause) {
+        super(message, cause);
+        this.faultInfo = faultInfo;
+    }
+
+    /**
+     * @return the faultInfo
+     */
+    public Object getFaultInfo() {
+        return faultInfo;
+    }
+
+    public QName getFaultName() {
+        return faultName;
+    }
+
+    public void setFaultName(QName logical) {
+        this.faultName = logical;
+    }
+
+    public boolean isMatchingType(Object type) {
+        if (faultName == null) {
+            return false;
+        }
+
+        if ((type instanceof QName) && faultName.equals(type)) {
+            return true;
+        }
+        if (type instanceof XMLType && faultName.equals(((XMLType)type).getElementName())) {
+            return true;
+        }
+        return false;
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/util/JavaXMLMapper.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/util/JavaXMLMapper.java
new file mode 100644
index 0000000000..54c0a3ec11
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/util/JavaXMLMapper.java
@@ -0,0 +1,143 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.interfacedef.util;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.xml.namespace.QName;
+
+/**
+ * Utility class that can be used to map XSD types to Java classes and Java classes to XSD types.
+ *
+ * @version $Rev$ $Date$
+ */
+public final class JavaXMLMapper {
+    public static final String URI_2001_SCHEMA_XSD = "http://www.w3.org/2001/XMLSchema";
+    private static final Map<Class, QName> JAVA2XML = new HashMap<Class, QName>();
+    private static final Map<String, Class> XML2JAVA = new HashMap<String, Class>();
+
+    private JavaXMLMapper() {
+    }
+
+    static {
+        JAVA2XML.put(boolean.class, getTypeName("boolean"));
+        JAVA2XML.put(byte.class, getTypeName("byte"));
+        JAVA2XML.put(short.class, getTypeName("short"));
+        JAVA2XML.put(int.class, getTypeName("int"));
+        JAVA2XML.put(long.class, getTypeName("long"));
+        JAVA2XML.put(float.class, getTypeName("float"));
+        JAVA2XML.put(double.class, getTypeName("double"));
+        JAVA2XML.put(Boolean.class, getTypeName("boolean"));
+        JAVA2XML.put(Byte.class, getTypeName("byte"));
+        JAVA2XML.put(Short.class, getTypeName("short"));
+        JAVA2XML.put(Integer.class, getTypeName("int"));
+        JAVA2XML.put(Long.class, getTypeName("long"));
+        JAVA2XML.put(Float.class, getTypeName("float"));
+        JAVA2XML.put(Double.class, getTypeName("double"));
+        JAVA2XML.put(java.lang.String.class, getTypeName("string"));
+        JAVA2XML.put(java.math.BigInteger.class, getTypeName("integer"));
+        JAVA2XML.put(java.math.BigDecimal.class, getTypeName("decimal"));
+        JAVA2XML.put(java.util.Calendar.class, getTypeName("dateTime"));
+        JAVA2XML.put(java.util.Date.class, getTypeName("dateTime"));
+        JAVA2XML.put(javax.xml.namespace.QName.class, getTypeName("QName"));
+        JAVA2XML.put(java.net.URI.class, getTypeName("string"));
+        JAVA2XML.put(javax.xml.datatype.XMLGregorianCalendar.class, getTypeName("anySimpleType"));
+        JAVA2XML.put(javax.xml.datatype.Duration.class, getTypeName("duration"));
+        JAVA2XML.put(java.lang.Object.class, getTypeName("anyType"));
+        JAVA2XML.put(java.awt.Image.class, getTypeName("base64Binary"));
+        JAVA2XML.put(byte[].class, getTypeName("base64Binary"));
+        // java2XSD.put(javax.activation.DataHandler.class, getTypeName("base64Binary"));
+        JAVA2XML.put(javax.xml.transform.Source.class, getTypeName("base64Binary"));
+        JAVA2XML.put(java.util.UUID.class, getTypeName("string"));
+    }
+
+    static {
+        XML2JAVA.put("string", java.lang.String.class);
+        XML2JAVA.put("integer", java.math.BigInteger.class);
+        XML2JAVA.put("int", int.class);
+        XML2JAVA.put("long", long.class);
+        XML2JAVA.put("short", short.class);
+        XML2JAVA.put("decimal", java.math.BigDecimal.class);
+        XML2JAVA.put("float", float.class);
+        XML2JAVA.put("double", double.class);
+        XML2JAVA.put("boolean", boolean.class);
+        XML2JAVA.put("byte", byte.class);
+        XML2JAVA.put("QName", javax.xml.namespace.QName.class);
+        XML2JAVA.put("dateTime", javax.xml.datatype.XMLGregorianCalendar.class);
+        XML2JAVA.put("base64Binary", byte[].class);
+        XML2JAVA.put("hexBinary", byte[].class);
+        XML2JAVA.put("unsignedInt", long.class);
+        XML2JAVA.put("unsignedShort", int.class);
+        XML2JAVA.put("unsignedByte", short.class);
+        XML2JAVA.put("time", javax.xml.datatype.XMLGregorianCalendar.class);
+        XML2JAVA.put("date", javax.xml.datatype.XMLGregorianCalendar.class);
+        XML2JAVA.put("gDay", javax.xml.datatype.XMLGregorianCalendar.class);
+        XML2JAVA.put("gMonth", javax.xml.datatype.XMLGregorianCalendar.class);
+        XML2JAVA.put("gYear", javax.xml.datatype.XMLGregorianCalendar.class);
+        XML2JAVA.put("gYearMonth", javax.xml.datatype.XMLGregorianCalendar.class);
+        XML2JAVA.put("gMonthDay", javax.xml.datatype.XMLGregorianCalendar.class);
+        XML2JAVA.put("anySimpleType", java.lang.Object.class); // For elements
+        // XML2JAVA.put("anySimpleType", java.lang.String.class); // For
+        // attributes
+        XML2JAVA.put("duration", javax.xml.datatype.Duration.class);
+        XML2JAVA.put("NOTATION", javax.xml.namespace.QName.class);
+    }
+
+    public static Class getJavaType(QName xmlType) {
+        if (URI_2001_SCHEMA_XSD.equals(xmlType.getNamespaceURI())) {
+            return XML2JAVA.get(xmlType.getLocalPart());
+        } else {
+            return null;
+        }
+    }
+
+    private static QName getTypeName(String name) {
+        return new QName(URI_2001_SCHEMA_XSD, name);
+    }
+
+    public static QName getXMLType(Class javaType) {
+        return JAVA2XML.get(javaType);
+    }
+    
+    private static String getPackageName(Class<?> cls) {
+        String name = cls.getName();
+        int index = name.lastIndexOf('.');
+        return index == -1 ? "" : name.substring(0, index);
+    }
+
+    public static String getNamespace(Class<?> cls) {
+        String packageName = getPackageName(cls);
+        if ("".equals(packageName)) {
+            return "";
+        }
+        StringBuffer ns = new StringBuffer("http://");
+        String[] names = packageName.split("\\.");
+        for (int i = names.length - 1; i >= 0; i--) {
+            ns.append(names[i]);
+            if (i != 0) {
+                ns.append('.');
+            }
+        }
+        ns.append('/');
+        return ns.toString();
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/util/TypeInfo.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/util/TypeInfo.java
new file mode 100644
index 0000000000..2598dc8545
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/util/TypeInfo.java
@@ -0,0 +1,100 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.interfacedef.util;
+
+import javax.xml.namespace.QName;
+
+/**
+ * An abstraction of XML schema types
+ *
+ * @version $Rev$ $Date$
+ */
+public class TypeInfo {
+    private QName name;
+
+    private boolean isSimpleType;
+
+    private TypeInfo baseType;
+
+    /**
+     * @param name
+     * @param isSimpleType
+     */
+    public TypeInfo(QName name, boolean isSimpleType, TypeInfo baseType) {
+        super();
+        this.name = name;
+        this.isSimpleType = isSimpleType;
+        this.baseType = baseType;
+    }
+
+    /**
+     * @return the isSimpleType
+     */
+    public boolean isSimpleType() {
+        return isSimpleType;
+    }
+
+    /**
+     * @return the name
+     */
+    public QName getQName() {
+        return name;
+    }
+
+    /**
+     * @return the baseType
+     */
+    public TypeInfo getBaseType() {
+        return baseType;
+    }
+
+    @Override
+    public String toString() {
+        StringBuffer sb = new StringBuffer();
+        sb.append("Type: ").append(name);
+        return sb.toString();
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((name == null) ? 0 : name.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        final TypeInfo other = (TypeInfo)obj;
+        if (name == null) {
+            if (other.name != null)
+                return false;
+        } else if (!name.equals(other.name))
+            return false;
+        return true;
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/util/WrapperInfo.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/util/WrapperInfo.java
new file mode 100644
index 0000000000..12db460959
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/util/WrapperInfo.java
@@ -0,0 +1,190 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.interfacedef.util;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tuscany.sca.interfacedef.DataType;
+import org.apache.tuscany.sca.interfacedef.impl.DataTypeImpl;
+
+/**
+ * The "Wrapper Style" WSDL operation is defined by The Java API for XML-Based
+ * Web Services (JAX-WS) 2.0 specification, section 2.3.1.2 Wrapper Style. <p/>
+ * A WSDL operation qualifies for wrapper style mapping only if the following
+ * criteria are met:
+ * <ul>
+ * <li>(i) The operation�s input and output messages (if present) each contain
+ * only a single part
+ * <li>(ii) The input message part refers to a global element declaration whose
+ * localname is equal to the operation name
+ * <li>(iii) The output message part refers to a global element declaration
+ * <li>(iv) The elements referred to by the input and output message parts
+ * (henceforth referred to as wrapper elements) are both complex types defined
+ * using the xsd:sequence compositor
+ * <li>(v) The wrapper elements only contain child elements, they must not
+ * contain other structures such as wildcards (element or attribute),
+ * xsd:choice, substitution groups (element references are not permitted) or
+ * attributes; furthermore, they must not be nillable.
+ * </ul>
+ * 
+ * @version $Rev$ $Date$
+ */
+public class WrapperInfo {
+    private ElementInfo inputWrapperElement;
+
+    private ElementInfo outputWrapperElement;
+
+    private List<ElementInfo> inputChildElements;
+
+    private List<ElementInfo> outputChildElements;
+
+    // The data type of the unwrapped input child elements 
+    private DataType<List<DataType>> unwrappedInputType;
+
+    // The data type of the unwrapped output child element (we only supports one child)
+    private DataType<XMLType> unwrappedOutputType;
+
+    // The data for the input/output wrappers
+    private String dataBinding;
+
+    // The data type for the input (request) wrapper bean
+    private DataType<XMLType> inputWrapperType;
+    // The data type for the output (response) wrapper bean
+    private DataType<XMLType> outputWrapperType;
+
+    public WrapperInfo(String dataBinding,
+                       ElementInfo inputWrapperElement,
+                       ElementInfo outputWrapperElement,
+                       List<ElementInfo> inputElements,
+                       List<ElementInfo> outputElements) {
+        super();
+        this.dataBinding = dataBinding;
+        this.inputWrapperElement = inputWrapperElement;
+        this.outputWrapperElement = outputWrapperElement;
+        this.inputChildElements = inputElements;
+        this.outputChildElements = outputElements;
+    }
+
+    /**
+     * @return the inputElements
+     */
+    public List<ElementInfo> getInputChildElements() {
+        return inputChildElements;
+    }
+
+    /**
+     * @return the inputWrapperElement
+     */
+    public ElementInfo getInputWrapperElement() {
+        return inputWrapperElement;
+    }
+
+    /**
+     * @return the outputElements
+     */
+    public List<ElementInfo> getOutputChildElements() {
+        return outputChildElements;
+    }
+
+    /**
+     * @return the outputWrapperElement
+     */
+    public ElementInfo getOutputWrapperElement() {
+        return outputWrapperElement;
+    }
+
+    /**
+     * @return the unwrappedInputType
+     */
+    public DataType<List<DataType>> getUnwrappedInputType() {
+        if (unwrappedInputType == null) {
+            List<DataType> childTypes = new ArrayList<DataType>();
+            for (ElementInfo element : getInputChildElements()) {
+                DataType type = getDataType(element);
+                childTypes.add(type);
+            }
+            unwrappedInputType = new DataTypeImpl<List<DataType>>("idl:unwrapped.input", Object[].class, childTypes);
+        }
+        return unwrappedInputType;
+    }
+
+    private DataType getDataType(ElementInfo element) {
+        DataType type = null;
+        if (element.isMany()) {
+            DataType logical = new DataTypeImpl<XMLType>(dataBinding, Object.class, new XMLType(element));
+            type = new DataTypeImpl<DataType>("java:array", Object[].class, logical);
+        } else {
+            type = new DataTypeImpl<XMLType>(dataBinding, Object.class, new XMLType(element));
+        }
+        return type;
+    }
+
+    /**
+     * @return the unwrappedOutputType
+     */
+    public DataType getUnwrappedOutputType() {
+        if (unwrappedOutputType == null) {
+            List<ElementInfo> elements = getOutputChildElements();
+            if (elements != null && elements.size() > 0) {
+                if (elements.size() > 1) {
+                    // We don't support output with multiple parts
+                    // throw new IllegalArgumentException("Multi-part output is not supported");
+                }
+                ElementInfo element = elements.get(0);
+
+                unwrappedOutputType = getDataType(element);
+            }
+        }
+        return unwrappedOutputType;
+    }
+
+    public Class<?> getInputWrapperClass() {
+        return inputWrapperType == null ? null : inputWrapperType.getPhysical();
+    }
+
+    public Class<?> getOutputWrapperClass() {
+        return outputWrapperType == null ? null : outputWrapperType.getPhysical();
+    }
+
+    public String getDataBinding() {
+        return dataBinding;
+    }
+
+    public void setDataBinding(String dataBinding) {
+        this.dataBinding = dataBinding;
+    }
+
+    public DataType<XMLType> getInputWrapperType() {
+        return inputWrapperType;
+    }
+
+    public void setInputWrapperType(DataType<XMLType> inputWrapperType) {
+        this.inputWrapperType = inputWrapperType;
+    }
+
+    public DataType<XMLType> getOutputWrapperType() {
+        return outputWrapperType;
+    }
+
+    public void setOutputWrapperType(DataType<XMLType> outputWrapperType) {
+        this.outputWrapperType = outputWrapperType;
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/util/XMLType.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/util/XMLType.java
new file mode 100644
index 0000000000..26ecf6e352
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/interfacedef/util/XMLType.java
@@ -0,0 +1,152 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.interfacedef.util;
+
+import javax.xml.namespace.QName;
+
+/**
+ * The metadata for an XML element or type.
+ *
+ * @version $Rev$ $Date$
+ */
+public class XMLType {
+    public static final XMLType UNKNOWN = new XMLType(null, null);
+    protected QName element;
+    protected QName type;
+    protected boolean nillable = true;
+    protected boolean many = false;
+
+    /**
+     * @param element
+     */
+    public XMLType(ElementInfo element) {
+        super();
+        this.element = element.getQName();
+        if (element.getType() != null) {
+            this.type = element.getType().getQName();
+        }
+    }
+
+    /**
+     * @param element
+     */
+    public XMLType(TypeInfo type) {
+        this.element = null;
+        this.type = type.getQName();
+    }
+
+    public XMLType(QName element, QName type) {
+        this.element = element;
+        this.type = type;
+    }
+
+    /**
+     * @return the type
+     */
+    public QName getTypeName() {
+        return type;
+    }
+
+    public boolean isElement() {
+        return element != null;
+    }
+
+    public QName getElementName() {
+        return element;
+    }
+
+    public void setElementName(QName element) {
+        this.element = element;
+    }
+
+    public void setTypeName(QName type) {
+        this.type = type;
+    }
+
+    public static XMLType getType(QName type) {
+        return new XMLType(null, type);
+    }
+
+    /**
+     * @see java.lang.Object#hashCode()
+     */
+    @Override
+    public int hashCode() {
+        final int PRIME = 31;
+        int result = 1;
+        result = PRIME * result + ((element == null) ? 0 : element.hashCode());
+        result = PRIME * result + ((type == null) ? 0 : type.hashCode());
+        return result;
+    }
+
+    /**
+     * @see java.lang.Object#equals(java.lang.Object)
+     */
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        final XMLType other = (XMLType)obj;
+        if (element == null) {
+            if (other.element != null) {
+                return false;
+            }
+        } else if (!element.equals(other.element)) {
+            return false;
+        }
+        if (type == null) {
+            if (other.type != null) {
+                return false;
+            }
+        } else if (!type.equals(other.type)) {
+            return false;
+        }
+        return true;
+    }
+
+    @Override
+    public String toString() {
+        return "Element: " + element + " Type: " + type;
+    }
+
+    public boolean isNillable() {
+        return nillable;
+    }
+
+    public void setNillable(boolean niable) {
+        this.nillable = niable;
+    }
+
+    public boolean isMany() {
+        return many;
+    }
+
+    public void setMany(boolean many) {
+        this.many = many;
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/BindingType.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/BindingType.java
new file mode 100644
index 0000000000..f43c428563
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/BindingType.java
@@ -0,0 +1,27 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.policy;
+
+
+/**
+ * Definition of binding type which extends from sca:binding
+ */
+public interface BindingType extends ExtensionType {
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/DefaultPolicyFactory.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/DefaultPolicyFactory.java
new file mode 100644
index 0000000000..2da41675a1
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/DefaultPolicyFactory.java
@@ -0,0 +1,30 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.policy;
+
+import org.apache.tuscany.sca.policy.impl.PolicyFactoryImpl;
+
+/**
+ * A factory for the policy model.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class DefaultPolicyFactory extends PolicyFactoryImpl implements PolicyFactory {
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/ExtensionType.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/ExtensionType.java
new file mode 100644
index 0000000000..e7a93c8907
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/ExtensionType.java
@@ -0,0 +1,81 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.policy;
+
+import java.util.List;
+
+import javax.xml.namespace.QName;
+
+/**
+ * Definition of extension type: binding or implementation
+ */
+public interface ExtensionType {
+    QName BINDING_BASE = new QName("http://docs.oasis-open.org/ns/opencsa/sca/200903", "binding");
+    QName IMPLEMENTATION_BASE = new QName("http://docs.oasis-open.org/ns/opencsa/sca/200903", "implementation");
+
+    /**
+     * The name of the extension type (binding or implementation). The extension type name 
+     * attribute MUST be the QName of an XSD global element definition used for 
+     * binding/implementation elements of that type
+     * 
+     * @return The QName of this type
+     */
+    QName getType();
+
+    /**
+     * Set the QName for this type
+     * @param type The QName of this type
+     */
+    void setType(QName type);
+    
+    QName getBaseType();
+
+    /**
+     * A set of intents. The intents in the alwaysProvides set are always 
+     * provided by this extension type, whether the intents are attached 
+     * to the using component or not.
+     * 
+     * @return A list of intents that are always provided by this type
+     */
+    List<Intent> getAlwaysProvidedIntents();
+
+    /**
+     * a set of intents. The intents in the mayProvide set are provided by this 
+     * extension type if the intent in question is attached to the using 
+     * component.
+     * 
+     * @return A list of intents that may be provided by this type
+     */
+    List<Intent> getMayProvidedIntents();
+    /**
+     * Returns true if the model element is unresolved.
+     * 
+     * @return true if the model element is unresolved.
+     */
+    boolean isUnresolved();
+
+    /**
+     * Sets whether the model element is unresolved.
+     * 
+     * @param unresolved whether the model element is unresolved
+     */
+    void setUnresolved(boolean unresolved);
+    
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/ImplementationType.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/ImplementationType.java
new file mode 100644
index 0000000000..d142015f57
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/ImplementationType.java
@@ -0,0 +1,27 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.policy;
+
+
+/**
+ * Definition of an implementation type which extends from sca:implementation
+ */
+public interface ImplementationType extends ExtensionType {
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/Intent.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/Intent.java
new file mode 100644
index 0000000000..b79ccdab78
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/Intent.java
@@ -0,0 +1,160 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.policy;
+
+import java.util.List;
+
+import javax.xml.namespace.QName;
+
+/**
+ * Represents a policy intent. See the Policy Framework specification for a
+ * description of this element.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface Intent {
+    enum Type {
+        interaction, implementation
+    };
+
+    /**
+     * Returns the intent name.
+     * 
+     * @return the intent name
+     */
+    QName getName();
+
+    /**
+     * Sets the intent name
+     * 
+     * @param name the intent name
+     */
+    void setName(QName name);
+
+    /**
+     * Returns the list of SCA constructs that this intent is meant to
+     * configure.
+     * 
+     * @return the list of SCA constructs that this intent is meant to configure
+     */
+    List<ExtensionType> getConstrainedTypes();
+
+    /**
+     * Return a list of required intents
+     * @return The list of required intents
+     */
+    List<Intent> getRequiredIntents();
+
+    /**
+     * Returns the list of intents which are mutually exclusive with this intent.
+     * 
+     * @return the list of mutually exclusive intents.
+     */
+    List<Intent> getExcludedIntents();
+
+    /**
+     * Returns the list of qualified intents.  
+     * 
+     * @return the list of qualified intents.
+     */
+    List<Intent> getQualifiedIntents();
+
+    /**
+     * Get the default qualified intent
+     * 
+     * @return
+     */
+    Intent getDefaultQualifiedIntent();
+
+    /**
+     * Set the default qualified intent
+     * 
+     * @param qualifiedIntent
+     */
+    void setDefaultQualifiedIntent(Intent qualifiedIntent);
+
+    /**
+     * Get the intent type: Interaction or Implementation
+     * @return 
+     */
+    Type getType();
+
+    /**
+     * Set the intent type 
+     * @param type: Interaction or Implementation
+     */
+    void setType(Type type);
+
+    /**
+     * If this attribute is present and has a value of true it indicates that 
+     * the qualified intents defined for this intent are mutually exclusive
+     * 
+     * @return
+     */
+    boolean isMutuallyExclusive();
+
+    /**
+     * Set the value of mutuallyExclusive  
+     * @param mutuallyExclusive
+     */
+    void setMutuallyExclusive(boolean mutuallyExclusive);
+
+    /**
+     * Returns the intent description.
+     * 
+     * @return the intent description
+     */
+    String getDescription();
+
+    /**
+     * Sets the intent description.
+     * 
+     * @param description the intent description
+     */
+    void setDescription(String description);
+
+    /**
+     * Returns true if the model element is unresolved.
+     * 
+     * @return true if the model element is unresolved.
+     */
+
+    /**
+     * Get the parent intent for a qualified intent. If an intent is not qualified,
+     * return null.
+     * @return The parent intent or null if this intent is not qualified
+     */
+    Intent getQualifiableIntent();
+
+    /**
+     * Set the parent intent for a qualified intent
+     * @param intent
+     */
+    void setQualifiableIntent(Intent intent);
+
+    boolean isUnresolved();
+
+    /**
+     * Sets whether the model element is unresolved.
+     * 
+     * @param unresolved whether the model element is unresolved
+     */
+    void setUnresolved(boolean unresolved);
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/IntentMap.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/IntentMap.java
new file mode 100644
index 0000000000..5b401baeb3
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/IntentMap.java
@@ -0,0 +1,49 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.policy;
+
+import java.util.List;
+
+
+/**
+ * Map policies to the qualified intents
+ */
+public interface IntentMap {
+    /**
+     * Returns the intent realized by this intent map.
+     * 
+     * @return the intent realized by this intent map
+     */
+    Intent getProvidedIntent();
+
+    /**
+     * Sets the intent realized by this intent map.
+     * 
+     * @param providedIntent the intent realized by this intent map
+     */
+    void setProvidedIntent(Intent providedIntent);
+    
+    /**
+     * Get a list of qualifiers  
+     * 
+     * @return A list of qualifiers
+     */
+    List<Qualifier> getQualifiers();
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/PolicyAttachment.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/PolicyAttachment.java
new file mode 100644
index 0000000000..ee4f5b5236
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/PolicyAttachment.java
@@ -0,0 +1,31 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.policy;
+
+import java.util.List;
+
+/**
+ * Attach a policySet to a collection of policy subjects
+ */
+public interface PolicyAttachment {
+    PolicySet getPolicySet();
+    void setPolicySet(PolicySet policySet);
+    List<PolicySubject> getPolicySubjects();
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/PolicyExpression.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/PolicyExpression.java
new file mode 100644
index 0000000000..a29f214f98
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/PolicyExpression.java
@@ -0,0 +1,65 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.policy;
+
+import javax.xml.namespace.QName;
+
+/**
+ * Interface that will abstract various types of policy specifications
+ * and attachments for example WS-Policy
+ *
+ * @version $Rev$ $Date$
+ */
+public interface PolicyExpression {
+    /**
+     * Get the QName of the policy expression
+     * @return the QName of the policy expression
+     */
+    QName getName();
+
+    /**
+     * Set the QName of the policy expression
+     * @param name
+     */
+    void setName(QName name);
+
+    /**
+     * Get the policy definition in the type of the specific domain
+     * @return
+     */
+    <T> T getPolicy();
+
+    /**
+     * Set the policy definition
+     * @param expression
+     */
+    <T> void setPolicy(T policy);
+
+    /**
+     * 
+     * @param unresolved
+     */
+    void setUnresolved(boolean unresolved);
+
+    /**
+     * 
+     * @return
+     */
+    boolean isUnresolved();
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/PolicyFactory.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/PolicyFactory.java
new file mode 100644
index 0000000000..9e7de2f6da
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/PolicyFactory.java
@@ -0,0 +1,66 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.policy;
+
+/**
+ * A factory for the policy model.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface PolicyFactory {
+
+    /**
+     * Create a new intent.
+     * 
+     * @return a new intent
+     */
+    Intent createIntent();
+
+    /**
+     * Create a new policy set.
+     * 
+     * @return a new policy set
+     */
+    PolicySet createPolicySet();
+
+    /**
+     * Create a new intent map.
+     * 
+     * @return a new intent map
+     */
+    IntentMap createIntentMap();
+
+    /**
+     * create a new Qualifier
+     * 
+     * @return a Qualifier
+     */
+    Qualifier createQualifier();
+    
+    /**
+     * Create a new PolicyExpression
+     * @return
+     */
+    PolicyExpression createPolicyExpression();
+    
+    ExtensionType createExtensionType();
+    BindingType createBindingType();
+    ImplementationType createImplementationType();
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/PolicySet.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/PolicySet.java
new file mode 100644
index 0000000000..2b5b8458d5
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/PolicySet.java
@@ -0,0 +1,146 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.policy;
+
+import java.util.List;
+
+import javax.xml.namespace.QName;
+import javax.xml.xpath.XPathExpression;
+
+/**
+ * Represents a policy set. See the Policy Framework specification for a
+ * description of this element.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface PolicySet {
+
+    /**
+     * Returns the intent name.
+     * 
+     * @return the intent name
+     */
+    QName getName();
+
+    /**
+     * Sets the intent name
+     * 
+     * @param name the intent name
+     */
+    void setName(QName name);
+
+    /**
+     * Returns the list of
+     * 
+     * @return
+     */
+    List<PolicySet> getReferencedPolicySets();
+
+    /**
+     * Returns the list of provided intents
+     * 
+     * @return
+     */
+    List<Intent> getProvidedIntents();
+
+    /**
+     * Returns the list of concrete policies, either WS-Policy policy
+     * attachments, policy references, or policies expressed in another policy
+     * language.
+     * 
+     * @return the list of concrete policies
+     */
+    List<PolicyExpression> getPolicies();
+
+    /**
+     * Returns true if the model element is unresolved.
+     * 
+     * @return true if the model element is unresolved.
+     */
+    boolean isUnresolved();
+
+    /**
+     * Sets whether the model element is unresolved.
+     * 
+     * @param unresolved whether the model element is unresolved
+     */
+    void setUnresolved(boolean unresolved);
+
+    /**
+     * Returns the XPath expression that is to be used to evaluate
+     * if this PolicySet applies to specific policy subject
+     * 
+     * @return the XPath expression
+     */
+    String getAppliesTo();
+
+    /**
+     * Sets the XPath expression that is to be used to evaluate
+     * if this PolicySet applies to specific policy subject
+     * 
+     */
+    void setAppliesTo(String xpath);
+    
+    /**
+     * A string which is an XPath 1.0 expression identifying one or more
+     * elements (policy subject) in the Domain. It is used to declare which 
+     * set of elements the policySet is actually attached to.
+     * 
+     * @return The attachTo XPath
+     */
+    String getAttachTo();
+    
+    /**
+     * Set the attachTo XPath
+     * @param xpath
+     */
+    void setAttachTo(String xpath);
+    
+    /**
+     * Get the resolved XPathExpression for attachTo
+     * @return
+     */
+    XPathExpression getAttachToXPathExpression();
+    
+    /**
+     * Set the resolved XPathExpression for attachTo
+     * @param expression
+     */
+    void setAttachToXPathExpression(XPathExpression expression);
+
+    /**
+     * Returns the policies / policy attachments provided thro intent maps
+     * 
+     * @return
+     */
+    List<IntentMap> getIntentMaps();
+    
+    /**
+     * Get the XPath expression for the appliesTo attribute
+     * @return the XPath expression for the appliesTo attribute
+     */
+    XPathExpression getAppliesToXPathExpression();
+
+    /**
+     * Set the XPath expression for the appliesTo attribute
+     * @param xpathExpression the XPath expression for the appliesTo attribute
+     */
+    void setAppliesToXPathExpression(XPathExpression xpathExpression);
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/PolicySubject.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/PolicySubject.java
new file mode 100644
index 0000000000..35a86ceedf
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/PolicySubject.java
@@ -0,0 +1,56 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.tuscany.sca.policy;
+
+import java.util.List;
+
+/**
+ * A policy subject is an entity in the assembly with which a policy can be
+ * associated.
+ *
+ * For example, a policy subject can be one of the following:
+ * <ul>
+ * <li>composite
+ * <li>component
+ * <li>implementation
+ * <li>service
+ * <li>reference
+ * <li>binding
+ * <li>interface
+ * </ul>
+ */
+public interface PolicySubject {
+    /**
+     * Get a list of required intents
+     *
+     * @return
+     */
+    List<Intent> getRequiredIntents();
+
+    /**
+     * Get a list of attached policySets
+     *
+     * @return A list of policySets
+     */
+    List<PolicySet> getPolicySets();
+
+    ExtensionType getExtensionType();
+    void setExtensionType(ExtensionType type);
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/Qualifier.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/Qualifier.java
new file mode 100644
index 0000000000..c1862283c7
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/Qualifier.java
@@ -0,0 +1,44 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.policy;
+
+import java.util.List;
+
+/**
+ * A qualifier provides a list of policies for a qualified intent within the IntentMap
+ */
+public interface Qualifier {
+    /**
+     * Get the qualified intent for this qualifier
+     * @return The intent
+     */
+    Intent getIntent();
+
+    /**
+     * Set the qualified intent for this qualifier
+     */
+    void setIntent(Intent intent);
+
+    /**
+     * Get the list of policies provided by this qualifier
+     * @return A list of policies
+     */
+    List<PolicyExpression> getPolicies();
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/BindingTypeImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/BindingTypeImpl.java
new file mode 100644
index 0000000000..1a2a9c5bad
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/BindingTypeImpl.java
@@ -0,0 +1,38 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.policy.impl;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.policy.BindingType;
+
+/**
+ * Concrete implementation for a BindingType
+ *
+ * @version $Rev$ $Date$
+ */
+public class BindingTypeImpl extends ExtensionTypeImpl implements BindingType {
+    protected BindingTypeImpl() {
+        super();
+    }
+
+    public QName getBaseType() {
+        return BINDING_BASE;
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/ExtensionTypeImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/ExtensionTypeImpl.java
new file mode 100644
index 0000000000..97fbc19ced
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/ExtensionTypeImpl.java
@@ -0,0 +1,97 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.policy.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.policy.ExtensionType;
+import org.apache.tuscany.sca.policy.Intent;
+
+/**
+ * Concrete implementation for a BindingType
+ *
+ * @version $Rev$ $Date$
+ */
+public class ExtensionTypeImpl implements ExtensionType {
+
+    private List<Intent> alwaysProvides = new ArrayList<Intent>();
+    private List<Intent> mayProvide = new ArrayList<Intent>();
+    private QName typeName;
+    private boolean unResolved = true;
+
+    protected ExtensionTypeImpl() {
+
+    }
+
+    public List<Intent> getAlwaysProvidedIntents() {
+        return alwaysProvides;
+    }
+
+    public List<Intent> getMayProvidedIntents() {
+        return mayProvide;
+    }
+
+    public QName getType() {
+        return typeName;
+    }
+
+    public void setType(QName type) {
+        this.typeName = type;
+    }
+
+    public boolean isUnresolved() {
+        return unResolved;
+    }
+
+    public void setUnresolved(boolean unresolved) {
+        this.unResolved = unresolved;
+    }
+
+    @Override
+    public int hashCode() {
+        return String.valueOf(getType()).hashCode();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        } else if (obj instanceof ExtensionTypeImpl) {
+            if (getType() != null) {
+                return getType().equals(((ExtensionTypeImpl)obj).getType());
+            } else {
+                return ((ExtensionTypeImpl)obj).getType() == null;
+            }
+        } else {
+            return false;
+        }
+    }
+
+    @Override
+    public String toString() {
+        return (this.typeName != null) ? getType().toString() : "null";
+    }
+
+    public QName getBaseType() {
+        return null;
+    }
+};
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/ImplementationTypeImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/ImplementationTypeImpl.java
new file mode 100644
index 0000000000..5c285e4d95
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/ImplementationTypeImpl.java
@@ -0,0 +1,39 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.policy.impl;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.policy.ImplementationType;
+
+/**
+ * Concrete implementation for a Implementation Type
+ *
+ * @version $Rev$ $Date$
+ */
+public class ImplementationTypeImpl extends ExtensionTypeImpl implements ImplementationType {
+    protected ImplementationTypeImpl() {
+        super();
+    }
+
+    public QName getBaseType() {
+        return IMPLEMENTATION_BASE;
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/IntentImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/IntentImpl.java
new file mode 100644
index 0000000000..27a77f3ba8
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/IntentImpl.java
@@ -0,0 +1,168 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.policy.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.policy.ExtensionType;
+import org.apache.tuscany.sca.policy.Intent;
+
+/**
+ * Represents a policy intent.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class IntentImpl implements Intent {
+
+    private QName name;
+    private Type type;
+    private List<ExtensionType> constrainedTypes = new ArrayList<ExtensionType>();
+    private String description;
+    private List<Intent> qualifiedIntents = new ArrayList<Intent>();
+    private Intent defaultQualifiedIntent;
+    private Intent parent;
+    private List<Intent> requiredIntents = new ArrayList<Intent>();
+    private List<Intent> excludedIntents = new ArrayList<Intent>();
+    private boolean mutuallyExclusive;
+    private boolean unresolved = true;
+
+    protected IntentImpl() {
+    }
+
+    public QName getName() {
+        return name;
+    }
+
+    public void setName(QName name) {
+        this.name = name;
+    }
+
+    public List<ExtensionType> getConstrainedTypes() {
+        return constrainedTypes;
+    }
+
+    public void setConstrainedTypes(List<ExtensionType> constrainedTypes) {
+        this.constrainedTypes = constrainedTypes;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public Intent getQualifiableIntent() {
+        return parent;
+    }
+
+    public void setQualifiableIntent(Intent parent) {
+        this.parent = parent;
+    }
+
+    public List<Intent> getQualifiedIntents() {
+        return qualifiedIntents;
+    }
+
+    public void setQualifiedIntents(List<Intent> qualifiedIntents) {
+        this.qualifiedIntents = qualifiedIntents;
+    }
+
+    public List<Intent> getRequiredIntents() {
+        return requiredIntents;
+    }
+
+    public void setRequiredIntents(List<Intent> requiredIntents) {
+        this.requiredIntents = requiredIntents;
+    }
+
+    public List<Intent> getExcludedIntents() {
+        return excludedIntents;
+    }
+
+    public void setExcludedIntents(List<Intent> excludedIntents) {
+        this.excludedIntents = excludedIntents;
+    }
+
+    public boolean isUnresolved() {
+        return unresolved;
+    }
+
+    public void setUnresolved(boolean unresolved) {
+        this.unresolved = unresolved;
+    }
+
+    public Type getType() {
+        return type;
+    }
+
+    public void setType(Type type) {
+        this.type = type;
+    }
+
+    public boolean isMutuallyExclusive() {
+        return mutuallyExclusive;
+    }
+
+    public void setMutuallyExclusive(boolean mutuallyExclusive) {
+        this.mutuallyExclusive = mutuallyExclusive;
+    }
+
+    public Intent getDefaultQualifiedIntent() {
+        return defaultQualifiedIntent;
+    }
+
+    public void setDefaultQualifiedIntent(Intent defaultQualifiedIntent) {
+        this.defaultQualifiedIntent = defaultQualifiedIntent;
+    }
+    
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((name == null) ? 0 : name.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        IntentImpl other = (IntentImpl)obj;
+        if (name == null) {
+            if (other.name != null)
+                return false;
+        } else if (!name.equals(other.name))
+            return false;
+        return true;
+    }
+    
+    public String toString() {
+        return String.valueOf(name);
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/IntentMapImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/IntentMapImpl.java
new file mode 100644
index 0000000000..6e2941ff5c
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/IntentMapImpl.java
@@ -0,0 +1,61 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.policy.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.IntentMap;
+import org.apache.tuscany.sca.policy.Qualifier;
+
+/**
+ * Represents an intent map.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class IntentMapImpl implements IntentMap {
+
+    private boolean unresolved;
+    private Intent providedIntent;
+    private List<Qualifier> qualifiers = new ArrayList<Qualifier>();
+    
+    protected IntentMapImpl() {
+    }
+
+    public boolean isUnresolved() {
+        return unresolved;
+    }
+
+    public void setUnresolved(boolean unresolved) {
+        this.unresolved = unresolved;
+    }
+
+    public Intent getProvidedIntent() {
+        return providedIntent;
+    }
+
+    public void setProvidedIntent(Intent providedIntent) {
+        this.providedIntent = providedIntent;
+    }
+
+    public List<Qualifier> getQualifiers() {
+        return qualifiers;
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/PolicyExpressionImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/PolicyExpressionImpl.java
new file mode 100644
index 0000000000..71e5eef6a7
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/PolicyExpressionImpl.java
@@ -0,0 +1,86 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.policy.impl;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.policy.PolicyExpression;
+
+public class PolicyExpressionImpl implements PolicyExpression {
+    private QName name;
+    private Object policy;
+    private boolean unresolved = true;
+
+    protected PolicyExpressionImpl() {
+    }
+
+    public QName getName() {
+        return name;
+    }
+
+    public <T> T getPolicy() {
+        return (T)policy;
+    }
+
+    public boolean isUnresolved() {
+        return unresolved;
+    }
+
+    public void setName(QName name) {
+        this.name = name;
+    }
+
+    public <T> void setPolicy(T policy) {
+        this.policy = policy;
+    }
+
+    public void setUnresolved(boolean unresolved) {
+        this.unresolved = unresolved;
+    }
+    
+    public String toString() {
+        return String.valueOf(name);
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((name == null) ? 0 : name.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        PolicyExpressionImpl other = (PolicyExpressionImpl)obj;
+        if (name == null) {
+            if (other.name != null)
+                return false;
+        } else if (!name.equals(other.name))
+            return false;
+        return true;
+    }
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/PolicyFactoryImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/PolicyFactoryImpl.java
new file mode 100644
index 0000000000..c67ff1eab8
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/PolicyFactoryImpl.java
@@ -0,0 +1,70 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.policy.impl;
+
+import org.apache.tuscany.sca.policy.BindingType;
+import org.apache.tuscany.sca.policy.ExtensionType;
+import org.apache.tuscany.sca.policy.ImplementationType;
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.IntentMap;
+import org.apache.tuscany.sca.policy.PolicyExpression;
+import org.apache.tuscany.sca.policy.PolicyFactory;
+import org.apache.tuscany.sca.policy.PolicySet;
+import org.apache.tuscany.sca.policy.Qualifier;
+
+/**
+ * A factory for the policy model.
+ * 
+ * @version $Rev$ $Date$
+ */
+public abstract class PolicyFactoryImpl implements PolicyFactory {
+
+    public Intent createIntent() {
+        return new IntentImpl();
+    }
+
+    public PolicySet createPolicySet() {
+        return new PolicySetImpl();
+    }
+
+    public IntentMap createIntentMap() {
+        return new IntentMapImpl();
+    }
+
+    public Qualifier createQualifier() {
+        return new QualifierImpl();
+    }
+
+    public PolicyExpression createPolicyExpression() {
+        return new PolicyExpressionImpl();
+    }
+    
+    public BindingType createBindingType() {
+        return new BindingTypeImpl();
+    }
+    
+    public ImplementationType createImplementationType() {
+        return new ImplementationTypeImpl();
+    }
+
+    public ExtensionType createExtensionType() {
+        return new ExtensionTypeImpl();
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/PolicySetImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/PolicySetImpl.java
new file mode 100644
index 0000000000..75d1229cd8
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/PolicySetImpl.java
@@ -0,0 +1,145 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.policy.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.xml.namespace.QName;
+import javax.xml.xpath.XPathExpression;
+
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.IntentMap;
+import org.apache.tuscany.sca.policy.PolicyExpression;
+import org.apache.tuscany.sca.policy.PolicySet;
+
+/**
+ * Represents a policy set.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class PolicySetImpl implements PolicySet {
+
+    private QName name;
+    private String appliesTo;
+    private String attachTo;
+    private List<Intent> providedIntents = new ArrayList<Intent>();
+    private List<PolicySet> referencedPolicySets = new ArrayList<PolicySet>();
+    private boolean unresolved = true;
+
+    private XPathExpression appliesToXPathExpression;
+    private XPathExpression attachToXPathExpression;
+
+    private List<IntentMap> intentMaps = new ArrayList<IntentMap>();
+    private List<PolicyExpression> policies = new ArrayList<PolicyExpression>();
+
+    public QName getName() {
+        return name;
+    }
+
+    public void setName(QName name) {
+        this.name = name;
+    }
+
+    public String getAppliesTo() {
+        return appliesTo;
+    }
+
+    public void setAppliesTo(String appliesTo) {
+        this.appliesTo = appliesTo;
+    }
+
+    public String getAttachTo() {
+        return attachTo;
+    }
+
+    public void setAttachTo(String attachTo) {
+        this.attachTo = attachTo;
+    }
+
+    public boolean isUnresolved() {
+        return unresolved;
+    }
+
+    public void setUnresolved(boolean unresolved) {
+        this.unresolved = unresolved;
+    }
+
+    public XPathExpression getAppliesToXPathExpression() {
+        return appliesToXPathExpression;
+    }
+
+    public void setAppliesToXPathExpression(XPathExpression appliesToXPathExpression) {
+        this.appliesToXPathExpression = appliesToXPathExpression;
+    }
+
+    public XPathExpression getAttachToXPathExpression() {
+        return attachToXPathExpression;
+    }
+
+    public void setAttachToXPathExpression(XPathExpression attachToXPathExpression) {
+        this.attachToXPathExpression = attachToXPathExpression;
+    }
+
+    public List<IntentMap> getIntentMaps() {
+        return intentMaps;
+    }
+
+    public List<Intent> getProvidedIntents() {
+        return providedIntents;
+    }
+
+    public List<PolicySet> getReferencedPolicySets() {
+        return referencedPolicySets;
+    }
+
+    public List<PolicyExpression> getPolicies() {
+        return policies;
+    }
+    
+    public String toString() {
+        return String.valueOf(name);
+    }    
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((name == null) ? 0 : name.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        PolicySetImpl other = (PolicySetImpl)obj;
+        if (name == null) {
+            if (other.name != null)
+                return false;
+        } else if (!name.equals(other.name))
+            return false;
+        return true;
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/QualifierImpl.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/QualifierImpl.java
new file mode 100644
index 0000000000..102bea8d41
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/impl/QualifierImpl.java
@@ -0,0 +1,48 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.policy.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.PolicyExpression;
+import org.apache.tuscany.sca.policy.Qualifier;
+
+public class QualifierImpl implements Qualifier {
+    private Intent intent;
+    private List<PolicyExpression> policies = new ArrayList<PolicyExpression>();
+
+    protected QualifierImpl() {
+    }
+
+    public Intent getIntent() {
+        return intent;
+    }
+
+    public List<PolicyExpression> getPolicies() {
+        return policies;
+    }
+
+    public void setIntent(Intent intent) {
+        this.intent = intent;
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/util/PolicyHelper.java b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/util/PolicyHelper.java
new file mode 100644
index 0000000000..f87938a5cb
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/java/org/apache/tuscany/sca/policy/util/PolicyHelper.java
@@ -0,0 +1,97 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.policy.util;
+
+import java.util.ArrayList;
+import java.util.Collection;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.definitions.Definitions;
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.PolicyExpression;
+import org.apache.tuscany.sca.policy.PolicySet;
+import org.apache.tuscany.sca.policy.PolicySubject;
+
+/**
+ * A utility that helps to navigate the policy model
+ */
+public class PolicyHelper {
+    public PolicySet getPolicySet(PolicySubject subject, QName policySetName) {
+        for (PolicySet ps : subject.getPolicySets()) {
+            if (ps.getName().equals(policySetName)) {
+                return ps;
+            }
+        }
+        return null;
+    }
+
+    public Intent getIntent(Definitions subject, QName intentName) {
+        for (Intent i : subject.getIntents()) {
+            if (i.getName().equals(intentName)) {
+                return i;
+            }
+        }
+        return null;
+    }
+
+    public PolicySet getPolicySet(Definitions subject, QName policySetName) {
+        for (PolicySet ps : subject.getPolicySets()) {
+            if (ps.getName().equals(policySetName)) {
+                return ps;
+            }
+        }
+        return null;
+    }
+
+    public Intent getIntent(PolicySubject subject, QName intentName) {
+        for (Intent i : subject.getRequiredIntents()) {
+            if (i.getName().equals(intentName)) {
+                return i;
+            }
+        }
+        return null;
+    }
+
+    public Collection<PolicyExpression> getPolicyExpressions(PolicySubject subject, QName policyName) {
+        Collection<PolicyExpression> policies = new ArrayList<PolicyExpression>();
+        for (PolicySet ps : subject.getPolicySets()) {
+            for (PolicyExpression exp : ps.getPolicies()) {
+                if (exp.getName().equals(policyName)) {
+                    policies.add(exp);
+                }
+            }
+        }
+        return policies;
+    }
+
+    public Collection<Object> getPolicies(PolicySubject subject, QName policyName) {
+        Collection<Object> policies = new ArrayList<Object>();
+        for (PolicySet ps : subject.getPolicySets()) {
+            for (PolicyExpression exp : ps.getPolicies()) {
+                if (exp.getName().equals(policyName)) {
+                    policies.add(exp.getPolicy());
+                }
+            }
+        }
+        return policies;
+    }
+
+}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/META-INF/services/org.apache.tuscany.sca.assembly.AssemblyFactory b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/META-INF/services/org.apache.tuscany.sca.assembly.AssemblyFactory
new file mode 100644
index 0000000000..20189eae98
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/META-INF/services/org.apache.tuscany.sca.assembly.AssemblyFactory
@@ -0,0 +1,18 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+# 
+#   http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License. 
+
+org.apache.tuscany.sca.assembly.DefaultAssemblyFactory
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/META-INF/services/org.apache.tuscany.sca.assembly.EndpointFactory b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/META-INF/services/org.apache.tuscany.sca.assembly.EndpointFactory
new file mode 100644
index 0000000000..ebbb4e93a7
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/META-INF/services/org.apache.tuscany.sca.assembly.EndpointFactory
@@ -0,0 +1,18 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+# 
+#   http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License. 
+
+org.apache.tuscany.sca.assembly.DefaultEndpointFactory
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/META-INF/services/org.apache.tuscany.sca.assembly.SCABindingFactory b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/META-INF/services/org.apache.tuscany.sca.assembly.SCABindingFactory
new file mode 100644
index 0000000000..6e24d0bcfd
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/META-INF/services/org.apache.tuscany.sca.assembly.SCABindingFactory
@@ -0,0 +1,19 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+# 
+#   http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License. 
+
+org.apache.tuscany.sca.assembly.impl.SCABindingFactoryImpl
+
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/META-INF/services/org.apache.tuscany.sca.assembly.builder.BuilderExtensionPoint b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/META-INF/services/org.apache.tuscany.sca.assembly.builder.BuilderExtensionPoint
new file mode 100644
index 0000000000..61171ac041
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/META-INF/services/org.apache.tuscany.sca.assembly.builder.BuilderExtensionPoint
@@ -0,0 +1,18 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+# 
+#   http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License. 
+
+org.apache.tuscany.sca.assembly.builder.DefaultBuilderExtensionPoint
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/META-INF/services/org.apache.tuscany.sca.definitions.DefinitionsFactory b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/META-INF/services/org.apache.tuscany.sca.definitions.DefinitionsFactory
new file mode 100644
index 0000000000..c1cb41d967
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/META-INF/services/org.apache.tuscany.sca.definitions.DefinitionsFactory
@@ -0,0 +1,17 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+# 
+#   http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License. 
+org.apache.tuscany.sca.definitions.DefaultDefinitionsFactory
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/META-INF/services/org.apache.tuscany.sca.interfacedef.InterfaceContractMapper b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/META-INF/services/org.apache.tuscany.sca.interfacedef.InterfaceContractMapper
new file mode 100644
index 0000000000..e2da378609
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/META-INF/services/org.apache.tuscany.sca.interfacedef.InterfaceContractMapper
@@ -0,0 +1,19 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+# 
+#   http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License. 
+
+org.apache.tuscany.sca.interfacedef.impl.InterfaceContractMapperImpl
+
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/META-INF/services/org.apache.tuscany.sca.policy.PolicyFactory b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/META-INF/services/org.apache.tuscany.sca.policy.PolicyFactory
new file mode 100644
index 0000000000..6ff07189e1
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/META-INF/services/org.apache.tuscany.sca.policy.PolicyFactory
@@ -0,0 +1,18 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+# 
+#   http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License. 
+
+org.apache.tuscany.sca.policy.DefaultPolicyFactory
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/org/apache/tuscany/sca/assembly/builder/assembly-conformance-messages.properties b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/org/apache/tuscany/sca/assembly/builder/assembly-conformance-messages.properties
new file mode 100644
index 0000000000..8ded10c9db
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/org/apache/tuscany/sca/assembly/builder/assembly-conformance-messages.properties
@@ -0,0 +1,327 @@
+#
+#
+#    Licensed to the Apache Software Foundation (ASF) under one
+#    or more contributor license agreements. See the NOTICE file
+#    distributed with this work for additional information
+#    regarding copyright ownership. The ASF licenses this file
+#    to you under the Apache License, Version 2.0 (the
+#    "License"); you may not use this file except in compliance
+#    with the License. You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing,
+#    software distributed under the License is distributed on an
+#    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+#    KIND, either express or implied. See the License for the
+#    specific language governing permissions and limitations
+#    under the License.
+#
+#
+# C.1 Mandatory Items
+ASM13001=\
+An SCA runtime MUST reject a composite file that does not conform to the sca-core.xsd, sca-interface-wsdl.xsd, sca-implementation-composite.xsd and sca-binding-sca.xsd schema.
+ASM13002=\
+An SCA runtime MUST reject a contribution file that does not conform to the sca-contribution.xsd schema.
+ASM13003=\
+An SCA runtime MUST reject a definitions file that does not conform to the sca-definitions.xsd schema.
+ASM40001=\
+The extension of a componentType side file name MUST be .componentType.
+ASM40002=\
+If present, the @constrainingType attribute of a <componentType/> element MUST reference a <constrainingType/> element in the Domain through its QName.
+ASM40003=\
+The @name attribute of a <service/> child element of a <componentType/> MUST be unique amongst the service elements of that <componentType/>.
+ASM40004=\
+The @name attribute of a  <reference/> child element of a <componentType/> MUST be unique amongst the reference elements of that <componentType/>.
+ASM40005=\
+The @name attribute of a <property/> child element of a <componentType/> MUST be unique amongst the property elements of that  <componentType/>.
+ASM40006=\
+If @wiredByImpl is set to "true", then any reference targets configured for this reference MUST be ignored by the runtime.  
+ASM40007=\
+The value of the property @type attribute MUST be the QName of an XML schema type.
+ASM40008=\
+The value of the property @element attribute MUST be the QName of an XSD global element.
+ASM40009=\
+The SCA runtime MUST ensure that any implementation default property value is replaced by a value for that property explicitly set by a component using that implementation.
+ASM40010=\
+A single property element MUST NOT contain both a @type attribute and an @element attribute.
+ASM40011=\
+When the componentType has @mustSupply="true" for a property element, a component using the implementation MUST supply a value for the property since the implementation has no default value for the property.
+ASM50001=\ 
+The @name attribute of a <component/> child element of a <composite/> MUST be unique amongst the component elements of that <composite/>
+ASM50002=\
+The @name attribute of a service element of a <component/> MUST be unique amongst the service elements of that <component/>
+ASM50003=\
+The @name attribute of a service element of a <component/> MUST match the @name attribute of a service element of the componentType of the <implementation/> child element of the component.
+ ASM50004=\ 
+If an interface is declared for a component service, the interface MUST provide a compatible subset of the interface declared for the equivalent service in the componentType of the implementation
+ ASM50005=\ 
+If no binding elements are specified for the service, then the bindings specified for the equivalent service in the componentType of the implementation MUST be used, but if the componentType also has no bindings specified, then <binding.sca/> MUST be used as the binding. If binding elements are specified for the service, then those bindings MUST be used and they override any bindings specified for the equivalent service in the componentType of the implementation.
+ASM50006=\ 
+If the callback element is present and contains one or more binding child elements, then those bindings MUST be used for the callback.
+ASM50007=\
+The @name attribute of a reference element of a <component/> MUST be unique amongst the reference elements of that <component/>
+
+ASM50008=\
+The @name attribute of a reference element of a <component/> MUST match the @name attribute of a reference element of the componentType of the <implementation/> child element of the component.
+ASM50009=\
+The value of multiplicity for a component reference MUST only be equal or further restrict any value for the multiplicity of the reference with the same name in the componentType of the implementation, where further restriction means 0..n to 0..1 or 1..n to 1..1.
+ASM50010=\
+If @wiredByImpl="true" is set for a reference, then the reference MUST NOT be wired statically within a composite, but left unwired.
+ ASM50011=\
+If an interface is declared for a component reference, the interface MUST provide a compatible superset of the interface declared for the equivalent reference in the componentType of the implementation.
+ASM50012=\ 
+If no binding elements are specified for the reference, then the bindings specified for the equivalent reference in the componentType of the implementation MUST be used. If binding elements are specified for the reference, then those bindings MUST be used and they override any bindings specified for the equivalent reference in the componentType of the implementation.
+ASM50013=\
+If @wiredByImpl="true", other methods of specifying the target service MUST NOT be used.
+ASM50014=\
+If @autowire="true", the autowire procedure MUST only be used if no target is identified by any of the other ways listed above. It is not an error if @autowire="true" and a target is also defined through some other means, however in this  case the autowire procedure MUST NOT be used.
+ASM50015=\
+If a binding element has a value specified for a target service using its @uri attribute, the binding element MUST NOT identify target services using binding specific attributes or elements.
+ASM50016=\
+It is possible that a particular binding type uses more than a simple URI for the address of a target service. In cases where a reference element has a binding subelement that uses more than simple URI, the @uri attribute of the binding element MUST NOT be used to identify the target service - in this case binding specific attributes and/or child elements MUST be used.
+ASM50018=\
+A reference with multiplicity 0..1 or 0..n MAY have no target service defined.
+ASM50019=\
+A reference with multiplicity 0..1 or 1..1 MUST NOT have more that one target service defined.
+ASM50020=\
+A reference with multiplicity 1..1 or 1..n MUST have at least one target service defined.
+ASM50021=\
+A reference with multiplicity 0..n or 1..n MAY have one or more target services defined.
+ASM50022=\
+Where it is detected that the rules for the number of target services for a reference have been violated, either at deployment or at execution time, an SCA Runtime MUST raise an error no later than when the reference is invoked by the component implementation.
+ASM50025=\
+Where a component reference is promoted by a composite reference, the promotion MUST be treated from a multiplicity perspective as providing 0 or more target services for the component reference, depending upon the further configuration of the composite reference. These target services are in addition to any target services identified on the component reference itself, subject to the rules relating to multiplicity.
+ASM50026=\
+If a reference has a value specified for one or more target services in its @target attribute, there MUST NOT be any child <binding/> elements declared for that reference.
+ASM50027=\
+If the @value attribute of a component property element is declared, the type of the property MUST be an XML Schema simple type and the @value attribute MUST contain a single value of that type.
+ASM50028=\
+If the value subelement of a component property is specified, the type of the property MUST be an XML Schema simple type or an XML schema complex type.
+ASM50029=\
+If a component property value is declared using a child element of the <property/> element, the type of the property MUST be an XML Schema global element and the declared child element MUST be an instance of that global element.
+ASM50030=\
+A <component/> element MUST NOT contain two <property/> subelements with the same value of the @name attribute.
+ASM50031=\
+The @name attribute of a property element of a <component/> MUST be unique amongst the property elements of that <component/>.
+ASM50032
+If a property is single-valued, the <value/> subelement MUST NOT occur more than once.
+ASM50033=\
+A property <value/> subelement MUST NOT be used when the @value attribute is used to specify the value for that property.
+ASM50034=\
+If any <wire/> element with its @replace attribute set to "true" has a particular reference specified in its @source attribute, the value of the @target attribute for that reference MUST be ignored and MUST NOT be used to define target services for that reference.
+ASM50035=\
+A single property element MUST NOT contain both a @type attribute and an @element attribute.
+ASM50036=\
+The property type specified for the property element of a component MUST be compatible with the type of the property with the same @name declared in the component type of the implementation used by the component.  If no type is declared in the component property element, the type of the property declared in the componentType of the implementation MUST be used.
+ASM50037=\
+The @name attribute of a property element of a <component/> MUST match the @name attribute of a property element of the componentType of the <implementation/> child element of the component.
+ASM50038=\
+In these cases where the types of two property elements are matched, the types declared for the two <property/> elements MUST be compatible
+ASM50039=\
+A reference with multiplicity 0..1 MUST have no more than one target service defined.
+ASM50040=\
+A reference with multiplicity 1..1 MUST have exactly one target service defined.
+ASM50041=\
+A reference with multiplicity 1..n MUST have at least one target service defined.
+ASM50042=\
+If a component reference has @multiplicity 0..1 or 1..1 and @nonOverridable==true, then the component reference MUST NOT be promoted by any composite reference.
+ASM60001=\
+A composite @name attribute value MUST be unique within the namespace of the composite.
+ASM60002=\
+@local="true" for a composite means that all the components within the composite MUST run in the same operating system process.
+ASM60003=\
+The name of a composite <service/> element MUST be unique across all the composite services in the composite.
+ASM60004=\
+A composite <service/> element's @promote attribute MUST identify one of the component services within that composite.
+ASM60005=\ 
+If a composite service interface is specified it MUST be the same or a compatible subset of the interface provided by the promoted component service.
+ASM60006=\
+The name of a composite <reference/> element MUST be unique across all the composite references in the composite.
+ASM60007=\
+Each of the URIs declared by a composite reference's @promote attribute MUST identify a component reference within the composite.
+ASM60008=\
+the interfaces of the component references promoted by a composite reference MUST be the same, or if the composite reference itself declares an interface then each of the component reference interfaces MUST be a compatible subset of the composite reference interface..
+ASM60009=\
+the intents declared on a composite reference and on the component references which it promoites MUST NOT be mutually exclusive.
+ASM60010=\
+If any intents in the set which apply to a composite reference are mutually exclusive then the SCA runtime MUST raise an error.
+ASM60011=\
+The value specified for the @multiplicity attribute of a composite reference MUST be compatible with the multiplicity specified on each of the component references which it promotes, i.e. the multplicity of the composite reference MUST be equal to or further restrict the multiplicity of the component reference, except for the case where all the promoted component references have at least one target declared in which case a composite reference of 0..1 is compatble with component references of 1..1 and composite reference of 0..n is compatible with component references of 1..n.
+ASM60012=\ 
+If a composite reference has an interface specified, it MUST provide an interface which is the same or which is a compatible superset of the interface(s) declared by the promoted component reference(s).
+ASM60013=\
+If no interface is declared on a composite reference, the interface from one of its promoted component references MUST be used for the component type associated with the composite.
+ASM60014=\
+The @name attribute of a composite property MUST be unique amongst the properties of the same composite.
+ASM60022=\ 
+For each component reference for which autowire is enabled, the SCA runtime MUST search within the composite for target services which have an interface that is a compatible superset of the interface of the reference.
+ASM60024=\
+The intents, and policies applied to the service MUST be compatible with those on the reference when using autowire to wire a reference - so that wiring the reference to the service will not cause an error due to policy mismatch
+ASM60025=\
+for an autowire reference with multiplicity 0..1 or 1..1, the SCA runtime MUST wire the reference to one of the set of valid target services chosen from the set in a runtime-dependent fashion
+ASM60026=\
+for an autowire reference with multiplicity 0..n or 1..n, the reference MUST be wired to all of the set of valid target services
+ASM60027=\
+for an autowire reference with multiplicity 0..1 or 0..n, if the SCA runtime finds no valid target service, there is no problem - no services are wired and the SCA runtime MUST NOT raise an error
+ASM60028=\
+for an autowire reference with multiplicity 1..1 or 1..n, if the SCA runtime finds no valid target services an error MUST be raised by the SCA runtime since the reference is intended to be wired
+ASM60030=\
+The @name attribute of an <implementation.composite/> element MUST contain the QName of a composite in the SCA Domain.
+ASM60031=\
+The SCA runtime MUST raise an error if the composite resulting from the inclusion of one composite into another is invalid.
+ASM60032=\
+For a composite used as a component implementation, each composite service offered by the composite MUST promote a component service of a component that is within the composite. 
+ASM60033=\
+For a composite used as a component implementation, every component reference of components within the composite with a multiplicity of 1..1 or 1..n MUST be wired or promoted. 
+ASM60034=\
+For a composite used as a component implementation, all properties of components within the composite, where the underlying component implementation specifies "mustSupply=true" for the property, MUST either specify a value for the property or source the value from a composite property. 
+ASM60035=\
+All the component references promoted by a single composite reference MUST have the same value for @wiredByImpl.
+ASM60036=\
+If the @wiredByImpl attribute is not specified on the composite reference, the default value is "true" if all of the promoted component references have a wiredByImpl value of "true", and the default value is "false" if all the promoted component references have a wiredByImpl value of "false". If the @wiredByImpl attribute is specified, its value MUST be "true" if all of the promoted component references have a wiredByImpl value of "true", and its value MUST be "false" if all the promoted component references have a wiredByImpl value of "false".
+ASM60037=\
+<include/> processing MUST take place before the processing of the @promote attribute of a composite reference is performed.
+ASM60038=\
+<include/> processing MUST take place before the processing of the @promote attribute of a composite service is performed.
+ASM60039=\
+<include/> processing MUST take place before the @source and @target attributes of a wire are resolved.
+ASM60040=\
+A single property element MUST NOT contain both a @type attribute and an @element attribute.
+ASM60041=\
+If the included composite has the value true for the attribute @local then the including composite MUST have the same value for the @local attribute, else it is an error.
+ASM60042=\
+The @name attribute of an include element MUST be the QName of a composite in the SCA Domain.
+ASM60043=\
+The interface declared by the target of a wire MUST be a compatible superset of the interface declared by the source of the wire.
+ASM60044=\
+If the composite reference promotes multiple component references with different multiplicities, there is no default value for the @multiplicity attribute of the composite reference and a value for @multiplicity MUST be specified.
+ASM70001=\
+The constrainingType specifies the services, references and properties that MUST be provided by the implementation of the component to which the constrainingType is attached.
+ASM70002=\
+If the configuration of the component or its implementation does not conform to the constrainingType specified on the component element, the SCA runtime MUST raise an error.
+ASM70003=\
+The @name attribute of the constraining type MUST be unique in the SCA Domain.
+ASM70004=\
+When an implementation is constrained by a constrainingType its component type MUST contain all the services, references and properties specified in the constrainingType.
+ASM70005=\
+An implementation that is constrained by a constrainingType MUST NOT contain additional references with @multiplicity=1..1 or @multiplicity=1..n or additional properties with  @mustSupply=true
+ASM70006=\ 
+Additional services, references and properties provided by the implementation which are not declared in the constrainingType associated with a component MUST NOT be configured in any way by the containing composite.
+ASM70007=\
+When an implementation is constrained by a constrainingType and the constrainingType declares an interface for a service or for a reference, then the component type of the implementation MUST contain a declaration of a compatiible interface for that service or reference.
+ASM80001=\
+The interface.wsdl @interface attribute MUST reference a portType of a WSDL 1.1 document.
+ASM80002=\
+Remotable service Interfaces MUST NOT make use of method or operation overloading.
+ASM80003=\
+If a remotable service is called locally or remotely, the SCA container MUST ensure sure that no modification of input messages by the service or post-invocation modifications to return messages are seen by the caller.
+ASM80004=\
+If a reference is defined using a bidirectional interface element, the client component implementation using the reference calls the referenced service using the interface. The client MUST provide an implementation of the callback interface.
+ASM80005=\
+Either both interfaces of a bidirectional service MUST be remotable, or both MUST be local.  A bidirectional service MUST NOT mix local and remote services.
+ASM80008=\
+Any service or reference that uses an interface marked with intents MUST implicitly add those intents to its own @requires list.
+ASM80009=\
+In a bidirectional interface, the service interface can have more than one operation defined, and the callback interface can also have more than one operation defined. SCA runtimes MUST allow an invocation of any operation on the service interface to be followed by zero, one or many invocations of any of the operations on the callback interface.
+ASM80010=\
+Whenever an interface document declaring a callback interface is used in the declaration of an <interface/> element in SCA, it MUST be treated as being bidirectional with the declared callback interface.
+ASM80011=\
+If an <interface/> element references an interface document which declares a callback interface and also itself contains a declaration of a callback interface, the two callback interfaces MUST be compatible.
+ASM80016=\
+The interface.wsdl @callbackInterface attribute, if present, MUST reference a portType of a WSDL 1.1 document.
+ASM80017=\
+WSDL interfaces are always remotable and therefore an <interface.wsdl/> element MUST NOT contain remotable="false".
+ASM90001=\
+For a binding of a reference the @uri attribute defines the target URI of the reference. This MUST be either the componentName/serviceName for a wire to an endpoint within the SCA Domain, or the accessible address of some service endpoint either inside or outside the SCA Domain (where the addressing scheme is defined by the type of the binding).
+ASM90002=\
+When a service or reference has multiple bindings, only one binding can have the default @name value; all others MUST have a @name value specified that is unique within the service or reference.
+ASM90003=\
+If a reference has any bindings, they MUST be resolved, which means that each binding MUST include a value for the @uri attribute or MUST otherwise specify an endpoint. The reference MUST NOT be wired using other SCA mechanisms.
+ ASM90004=\
+To wire to a specific binding of a target service the syntax "componentName/serviceName/bindingName" MUST be used.
+ASM10001=\
+all of the QNames for the definitions contained in definitions.xml files MUST be unique within the Domain.
+ASM10002=\
+An SCA runtime MUST make available to the Domain all the artifacts contained within the definitions.xml files in the Domain.
+ASM10003=\
+An SCA runtime MUST reject a definitions.xml file that does not conform to the sca-definitions.xsd schema.
+ASM12001=\
+For any contribution packaging it MUST be possible to present the artifacts of the packaging to SCA as a hierarchy of resources based off of a single root
+ASM12005=\
+Where present, artifact-related or packaging-related artifact resolution mechanisms MUST be used by the SCA runtime to resolve artifact dependencies.
+ASM12006=\ 
+SCA requires that all runtimes MUST support the ZIP packaging format for contributions.
+ASM12009=\
+if there is ever a conflict between two indirect dependent contributions, then the conflict MUST be resolved by an explicit entry in the dependent contribution list.
+ASM12010=\ 
+Where present, non-SCA artifact resolution mechanisms MUST be used by the SCA runtime in precendence to the SCA mechanisms.
+ ASM12011=\
+If one of the non-SCA artifact resolution mechanisms is present, but there is a failure to find the resource indicated when using the mechanism (e.g. the URI is incorrect or invalid, say) the SCA runtime MUST raise an error and MUST NOT attempt to use SCA resolution mechanisms as an alternative.
+ASM12012=\
+The value of @autowire for the logical Domain composite MUST be autowire="false".
+ASM12013=\
+For components at the Domain level, with references for which @autowire="true" applies, the behaviour of the SCA runtime for a given Domain MUST take ONE of the 3 following forms:\
+1) The SCA runtime disallows deployment of any components with autowire references. In this case, the SCA runtime MUST raise an exception at the point where the component is deployed.\
+2) The SCA runtime evaluates the target(s) for the reference at the time that the component is deployed and does not update those targets when later deployment actions occur. \
+3) The SCA runtime re-evaluates the target(s) for the reference dynamically as later deployment actions occur resulting in updated reference targets which match the new Domain configuration. How the reconfiguration of the reference takes place is described by the relevant client and implementation specifications.
+ASM12015=\
+Where components are updated by deployment actions (their configuration is changed in some way, which includes changing the wires of component references), the new configuration MUST apply to all new instances of those components once the update is complete.
+ASM12017=\
+Where a component that is the target of a wire is removed, without the wire being changed, then future invocations of the reference that use that wire SHOULD fail with a ServiceUnavailable fault. If the wire is the result of the autowire process, the SCA runtime MUST:\
+* either cause future invocation of the target component's services to fail with a ServiceUnavailable fault\
+* or alternatively, if an alternative target component is available that satisfies the autowire process, update the reference of the source component 
+ASM12020=\
+Where a component is added to the Domain that is a potential target for a domain level component reference where that reference is marked as @autowire=true, the SCA runtime MUST:\
+- either update the references for the source component once the new component is running.  \
+- or alternatively, defer the updating of the references of the source component until the source component is stopped and restarted.
+ASM12021=\
+The SCA runtime MUST raise an error if an artifact cannot be resolved using these mechanisms, if present.
+ASM12022=\
+There can be multiple import declarations for a given namespace.   Where multiple import declarations are made for the same namespace, all the locations specified MUST be searched in lexical order.
+ASM12023=\
+When a contribution contains a reference to an artifact from a namespace that is declared in an import statement of the contribution, if the SCA artifact resolution mechanism is used to resolve the artifact, the SCA runtime MUST resolve artifacts in the following order:\
+1. from the locations identified by the import statement(s) for the namespace. Locations MUST NOT be searched recursively in order to locate artifacts (i.e. only a one-level search is performed).\
+2. from the contents of the contribution itself.
+ASM12024=\
+The SCA runtime MUST ignore local definitions of an artifact if the artifact is found through resolving an import statement.
+ASM12025=\
+The SCA runtime MUST raise an error if an artifact cannot be resolved by using artifact-related or packaging-related artifact resolution mechanisms, if present, by searching locations identified by the import statements of the contribution, if present, and by searching the contents of the contribution.
+ASM12026=\
+An SCA runtime MUST make the <import/> and <export/> elements found in the META-INF/sca-contribution.xml and META-INF/sca-contribution-generated.xml files available for the SCA artifact resolution process.
+ASM12027=\
+An SCA runtime MUST reject files that do not conform to the schema declared in sca-contribution.xsd.
+ASM12028=\
+An SCA runtime MUST merge the contents of sca-contribution-generated.xml into the contents of sca-contribution.xml, with the entries in sca-contribution.xml taking priority if there are any conflicting declarations.
+ASM12031=\
+When a contribution uses an artifact contained in another contribution through SCA artifact resolution, if that artifact itself has dependencies on other artifacts, the SCA runtime MUST resolve these dependencies in the context of the contribution containing the artifact, not in the context of the original contribution.
+ASM14003=\
+Where errors are only detected at runtime, when the error is detected an error MUST be raised to the component that is attempting the activity concerned with the error.
+
+# C.2 Non-mandatory Items
+ASM60021=\
+For the case of an un-wired reference with multiplicity 1..1 or 1..n the deployment process provided by an SCA runtime SHOULD issue a warning.
+ASM12002=\
+Within any contribution packaging A directory resource SHOULD exist at the root of the hierarchy named META-INF
+ASM12003=\
+Within any contribution packaging a document SHOULD exist directly under the META-INF directory named sca-contribution.xml which lists the SCA Composites within the contribution that are runnable.
+ASM12007=\
+Implementations of SCA MAY also raise an error if there are conflicting names exported from multiple contributions.
+ASM12008=\
+An SCA runtime MAY provide the contribution operation functions (install Contribution, update Contribution, add Deployment Composite, update Deployment Composite, remove Contribution).
+ASM12014=\
+Where <wire/> elements are added, removed or replaced by deployment actions, the components whose references are affected by those deployment actions MAY have their references updated by the SCA runtime dynamically without the need to stop and start those components. 
+ASM12016=\
+An SCA runtime MAY choose to maintain existing instances with the old configuration of components updated by deployment actions, but an SCA runtime MAY choose to stop and discard existing instances of those components.
+ASM12018=\
+Where a component that is the target of a wire is updated, future invocations of that reference SHOULD use the updated component. 
+ASM12029=\
+An SCA runtime MAY deploy the composites in <deployable/> elements found in the META-INF/sca-contribution.xml and META-INF/sca-contribution-generated.xml files.
+ASM12030=\
+For XML definitions, which are identified by QNames, the @namespace attribute of the export element SHOULD be the namespace URI for the exported definitions.
+ASM14001=\
+An SCA runtime SHOULD detect errors at deployment time where those errors can be found through static analysis. 
+ASM14002=\
+The SCA runtime SHOULD prevent deployment of contributions that are in error, and raise the error to the process performing the deployment (e.g. write a message to an interactive console or write a message to a log file).
+ASM14004=\
+When an error that could have been detected through static analysis is detected and raised at runtime for a component, the component SHOULD NOT be run until the error is fixed.
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/org/apache/tuscany/sca/assembly/builder/assembly-validation-messages.properties b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/org/apache/tuscany/sca/assembly/builder/assembly-validation-messages.properties
new file mode 100644
index 0000000000..a9a252e08b
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/org/apache/tuscany/sca/assembly/builder/assembly-validation-messages.properties
@@ -0,0 +1,76 @@
+#
+#
+#    Licensed to the Apache Software Foundation (ASF) under one
+#    or more contributor license agreements. See the NOTICE file
+#    distributed with this work for additional information
+#    regarding copyright ownership. The ASF licenses this file
+#    to you under the Apache License, Version 2.0 (the
+#    "License"); you may not use this file except in compliance
+#    with the License. You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing,
+#    software distributed under the License is distributed on an
+#    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+#    KIND, either express or implied. See the License for the
+#    specific language governing permissions and limitations
+#    under the License.
+#
+#
+DuplicateComponentName = Duplicate component name: Composite = {0} Component = {1}
+DuplicateComponentServiceName = Duplicate component service name: Component = {0} Service = {1}
+DuplicateComponentReferenceName = Duplicate component reference name: Component = {0} Reference = {1}
+DuplicateComponentPropertyName = Duplicate component property name: Component = {0} Property = {1}
+NoComponentImplementation = No implementation for component: Component = {0}
+ServiceNotFoundForComponentService = Component type service not found for component service (missing @Remotable annotation?): Component = {0} Service = {1}
+UnresolvedComponentImplementation = Component implementation not resolved: Component = {0} Uri = {1}
+DuplicateImplementationPropertyName = Duplicate property name: Component = {0} Property = {1}
+DuplicateImplementationServiceName = Duplicate service name: Component = {0} Service = {1}
+DuplicateImplementationReferenceName = Duplicate reference name: Component = {0} Reference = {1}
+PropertyNotFound = Property not found for component property: Component = {0} Property = {1}
+PropertyMustSupplyIncompatible = Component property mustSupply attribute incompatible with property: Component = {0} Property = {1}
+PropertyMustSupplyNull = [ASM_4008] No value configured on a mustSupply property: Component = {0} Property = {1}
+PropertyOverrideManyAttribute = Component property many attribute incompatible with property: Component = {0} Property = {1}
+ReferenceNotFoundForComponentReference = Component type reference not found for component reference: Component = {0} Reference = {1}
+ReferenceIncompatibleMultiplicity = Component reference multiplicity incompatible with reference multiplicity: Component = {0} Reference = {1}
+ReferenceIncompatibleInterface = Incompatible interfaces on component reference and target: Composite = {0} Reference = {1} Service = {2}
+ReferencePromotionIncompatibleInterface = Promoted reference interface incompatible with promoting reference: Promoting interface = {0} Promoted = {1}
+ReferencePromotionInterfacesNotEqual = Peer promoted references not equal: First interface = {0} second interface = {1}
+ReferenceIncompatibleComponentInterface = Component reference interface incompatible with implementation reference interface: Component = {0} Reference = {1} {2}
+ServiceIncompatibleComponentInterface = Component service interface incompatible with implementation service interface: Component = {0} Service = {1} {2}
+MultipleBindingsForService = Multiple bindings with the same name for a service: Service = {0} Binding name = {1}
+MultipleBindingsForReference = Multiple bindings with the same name for a reference: Reference = {0} Binding name = {1}
+ReferenceWithoutTargets = No targets for reference: Composite = {0} Reference = {1}
+PromotedReferenceNotFound = Promoted component reference not found: Composite = {0} Reference = {1}
+PromotedServiceNotFound = Promoted component service not found: Composite = {0} Service = {1}
+ComponentReferenceTargetNotFound = Component reference target not found, it might be a remote service running elsewhere in the SCA Domain: Composite = {0} Service = {1}
+NoSCABindingAvailableForUnresolvedService = A local service cannot be found for reference {0} target {1} and there is no SCA binding available to represent the unresolved target
+NoMatchingBinding = Component reference {0} does not have a binding which matches the bindings of service {1}
+NoMatchingCallbackBinding = Component reference {0} does not have a callback binding which matches the callback bindings of service {1}
+ReferenceEndPointMixWithTarget = Composite {0} Component {1} Reference {2} must not specify endpoints using both target attribute and with binding uri attribute
+CompositeAlreadyIncluded = Composite {0} has already been included.
+ComponentReferenceMoreWire = Component reference {0} has more than one wires
+WireTargetNotFound = Wire target not found : {0}
+WireSourceNotFound = Wire source not found : {0}
+WireIncompatibleInterface = Incompatible interfaces on wire source and target : source = {0} target = {1}
+ComponentIncompatibleInterface = Incompatible interfaces on component reference and target : reference = {0} target = {1}
+TooManyReferenceTargets = Too many targets on reference: {0}
+ReferenceInterfaceNotSubSet = Interface of composite reference {0} must be compatible with the interface declared by promoted component reference. {1}
+ServiceInterfaceNotSubSet = Interface of composite service {0} must be subset of the interface declared by promoted component service. {1}
+NoComponentReferenceTarget = No target services found for the component reference to be autowired: {0}
+NoTypeForComponentProperty = No type specified on component property: Component = {0} Property = {1}
+URLSyntaxException = URLSyntaxException when creating binding URI at component = {0} service = {1} binding = {2}
+IllegalCompositeIncusion = Local Composite {0} cannot include a non-local composite {1}
+PropertySourceNotFound = The property source {0} for property {1} in component {2} cannot be resolved to a composite property
+PropertySourceValueInvalid = The property source {0} for property {1} in component {2} has an invalid value. It should start with $ followed by the name of a composite property
+PropertySourceXPathInvalid = The property source {0} for property {1} in component {2} has an invalid XPath expression. The following error was returned while processing the XPath expression: {3}
+PropertyFileValueInvalid = The property file {0} for property {1} in component {2} is an invalid value. The following error was returned while processing the file name: {3}
+PolicyRelatedException = Policy Related Exception occured due to : {0}
+IntentNotFound = Intent {0} is not defined in SCA definitions
+PolicySetNotFound = PolicySet {0} is not defined in SCA definitions
+MutuallyExclusiveIntents = [POL40009] Intent {0} and {1} are mutually exclusive 
+PropertyXpathExpressionReturnedNull = The property XPath expression for component {0} property {1} expression {2} did not match anything in the source property
+PropertyHasManyValues = The property component {0} property {1} has many values but its "many" attribute is set to false
+PropertXSDTypesDontMatch = [ASM_5036] The property component {0} property {1} has XSD type {2} while its component type property has the XSD type {3}
+PropertXSDElementsDontMatch = [ASM_5036] The property component {0} property {1} has XSD element {2} while its component type property has the XSD element {3}
+\ No newline at end of file
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/org/apache/tuscany/sca/assembly/builder/assembly-validation-messages_it.properties b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/org/apache/tuscany/sca/assembly/builder/assembly-validation-messages_it.properties
new file mode 100644
index 0000000000..b94d37ba2d
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/org/apache/tuscany/sca/assembly/builder/assembly-validation-messages_it.properties
@@ -0,0 +1,30 @@
+#
+#
+#    Licensed to the Apache Software Foundation (ASF) under one
+#    or more contributor license agreements. See the NOTICE file
+#    distributed with this work for additional information
+#    regarding copyright ownership. The ASF licenses this file
+#    to you under the Apache License, Version 2.0 (the
+#    "License"); you may not use this file except in compliance
+#    with the License. You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing,
+#    software distributed under the License is distributed on an
+#    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+#    KIND, either express or implied. See the License for the
+#    specific language governing permissions and limitations
+#    under the License.
+#
+#
+DuplicateComponentName = Nome del componente duplicato: Composite = {0} Component = {1}
+DuplicateComponentServiceName = Nome del servizio del componente duplicato: Component = {0} Service = {1}
+DuplicateComponentReferenceName = Nome del reference del componente duplicato: Component = {0} Reference = {1}
+DuplicateComponentPropertyName = Nome della property del componente duplicato: Component = {0} Property = {1}
+NoComponentImplementation = Implementazione insistente per il componente: Component = {0}
+ServiceNotFoundForComponentService = Servizio non trovato per il componente: Component = {0} Service = {1}
+UnresolvedComponentImplementation = Implementazione del componente non trovata: Component = {0} Uri = {1}
+DuplicateImplementationPropertyName = Nome della property del componente duplicata: Component = {0} Property = {1}
+DuplicateImplementationReferenceName = Nome del riferimento duplicato: Component = {0} Reference = {1}
+PropertyNotFound = Property non trovata per il  componente: Component = {0} Property = {1}
diff --git a/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/org/apache/tuscany/sca/assembly/builder/definitions-validation-messages.properties b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/org/apache/tuscany/sca/assembly/builder/definitions-validation-messages.properties
new file mode 100644
index 0000000000..4cf9c01da5
--- /dev/null
+++ b/sca-java-2.x/branches/sca-java-2.0-M4/modules/assembly/src/main/resources/org/apache/tuscany/sca/assembly/builder/definitions-validation-messages.properties
@@ -0,0 +1,25 @@
+#
+#
+#    Licensed to the Apache Software Foundation (ASF) under one
+#    or more contributor license agreements. See the NOTICE file
+#    distributed with this work for additional information
+#    regarding copyright ownership. The ASF licenses this file
+#    to you under the Apache License, Version 2.0 (the
+#    "License"); you may not use this file except in compliance
+#    with the License. You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing,
+#    software distributed under the License is distributed on an
+#    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+#    KIND, either express or implied. See the License for the
+#    specific language governing permissions and limitations
+#    under the License.
+#
+#
+
+DuplicateIntent = Duplicate intent {0} found in domain
+DuplicatePolicysSet = Duplicate policy set {0} found in domain
+DuplicateImplementationType = Duplicate implementation type {0} found in domain
+DuplicateBindingType = Duplicate binding type {0} found in domain