Create branch for 2.0 beta2 release

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@1040693 13f79535-47bb-0310-9956-ffa450edef68

95 files changed, 10310 insertions, 0 deletions

diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/Artifact.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/Artifact.java
new file mode 100644
index 0000000000..238cc8c2fa
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/Artifact.java
@@ -0,0 +1,75 @@
+/*
+ * 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.contribution;
+
+import org.apache.tuscany.sca.assembly.Base;
+
+
+/**
+ * Represents an artifact in an SCA contribution.
+ *
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.asclient
+ */
+public interface Artifact extends Base {
+
+    /**
+     * Returns the URI that unique identifies the artifact inside the contribution.
+     *
+     * @return The artifact URI
+     */
+    String getURI();
+
+    /**
+     * Sets the URI that uniquely identifies the artifact inside the contribution.
+     *
+     * @param uri The artifact URI
+     */
+    void setURI(String uri);
+
+    /**
+     * Returns the location of the artifact.
+     *
+     * @return The artifact location
+     */
+    String getLocation();
+
+    /**
+     * Set the location of the artifact.
+     *
+     * @param location The artifact location
+     */
+    void setLocation(String location);
+
+
+    /**
+     * Returns the in-memory model representing the artifact.
+     *
+     * @return The model object
+     */
+    <T> T getModel();
+
+    /**
+     * Sets the in-memory model representing the artifact.
+     *
+     * @param model The model object
+     */
+    void setModel(Object model);
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/ContentType.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/ContentType.java
new file mode 100644
index 0000000000..81b0b08b9d
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/ContentType.java
@@ -0,0 +1,40 @@
+/*
+ * 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.contribution;
+
+/**
+ * Constants for the main supported contribution package type.
+ * 
+ * @version $Rev$ $Date$
+ */
+@Deprecated
+public interface ContentType {
+    
+    /**
+     * Java compressed contribution package
+     */
+    String JAR = "application/x-compressed";
+
+    /**
+     * Filesystem folder contribution package
+     */
+    String FOLDER = "application/vnd.tuscany.folder";
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/Contribution.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/Contribution.java
new file mode 100644
index 0000000000..777ba1f986
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/Contribution.java
@@ -0,0 +1,126 @@
+/*
+ * 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.contribution;
+
+import java.util.List;
+import java.util.Set;
+
+import org.apache.tuscany.sca.assembly.Composite;
+import org.apache.tuscany.sca.assembly.Extensible;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+
+/**
+ * The representation of an SCA contribution.
+ *
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.asclient
+ */
+public interface Contribution extends Artifact, Extensible {
+
+    /**
+     * Default location of contribution metadata in an SCA contribution.
+     */
+    String SCA_CONTRIBUTION_META = "META-INF/sca-contribution.xml";
+
+    /**
+     * Default location of a generated contribution metadata in an SCA contribution.
+     */
+    String SCA_CONTRIBUTION_GENERATED_META = "META-INF/sca-contribution-generated.xml";
+
+    /**
+     * Returns a list of exports based on the contribution metadata.
+     *
+     * @return The list of exports in this contribution
+     */
+    List<Export> getExports();
+
+    /**
+     * Returns a list of imports based on the contribution metadata.
+     *
+     * @return The list of imports in this contribution
+     */
+    List<Import> getImports();
+
+    /**
+     * Returns the list of deployable composites in the contribution.
+     *
+     * @return The list of deployable composites
+     */
+    List<Composite> getDeployables();
+
+    /**
+     * Returns the list of artifacts in the contribution.
+     *
+     * @return The list of artifacts in the contribution
+     */
+    List<Artifact> getArtifacts();
+
+    /**
+     * Returns the model resolver for the models representing the artifacts
+     * visible in the scope of this contribution.
+     *
+     * @return The model resolver
+     */
+    ModelResolver getModelResolver();
+
+    /**
+     * Sets the model resolver for the models representing the artifacts
+     * visible in the scope of this contribution.
+     *
+     * @param modelResolver The model resolver
+     */
+    void setModelResolver(ModelResolver modelResolver);
+
+    /**
+     * Returns the list of contributions that this contribution depends on.
+     *
+     * @return
+     */
+    List<Contribution> getDependencies();
+
+    /**
+     * Returns the ClassLoader used to load classes and resources from
+     * this contribution
+     *
+     * FIXME Remove this, the base contribution model should not depend
+     * on Java ClassLoaders.
+     *
+     * @return The contribution ClassLoader
+     */
+    ClassLoader getClassLoader();
+
+    /**
+     * Sets the ClassLoader used to load classes and resources from
+     * this contribution
+     *
+     * FIXME Remove this, the base contribution model should not depend
+     * on Java ClassLoaders.
+     *
+     * @param classLoader the contribution class loader
+     */
+    void setClassLoader(ClassLoader classLoader);
+
+    /**
+     * Get a list of mime types that apply to this contribution archive
+     * @return
+     */
+    Set<String> getTypes();
+
+}
\ No newline at end of file
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/ContributionFactory.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/ContributionFactory.java
new file mode 100644
index 0000000000..5937d535d0
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/ContributionFactory.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.contribution;
+
+
+/**
+ * A factory for the contribution model.
+ *
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.asclient
+ */
+public interface ContributionFactory {
+
+    /**
+     * Create a contribution model object
+     *
+     * @return The new contribution model object
+     */
+    Contribution createContribution();
+
+    /**
+     * Create a contribution metadata model object
+     *
+     * @return The new contribution metadata model object
+     */
+    ContributionMetadata createContributionMetadata();
+
+    /**
+     * Create an artifact model object
+     *
+     * @return The new artifact model object
+     */
+    Artifact createArtifact();
+
+    /**
+     * Create a default import model object.
+     *
+     * @return the new default import model object
+     */
+    DefaultImport createDefaultImport();
+
+    /**
+     * Create a default export model object.
+     *
+     * @return the new default export model object
+     */
+    DefaultExport createDefaultExport();
+
+}
\ No newline at end of file
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/ContributionMetadata.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/ContributionMetadata.java
new file mode 100644
index 0000000000..a62d7155c9
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/ContributionMetadata.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.contribution;
+
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.Base;
+import org.apache.tuscany.sca.assembly.Composite;
+import org.apache.tuscany.sca.assembly.Extensible;
+
+/**
+ * The representation of SCA contribution metadata.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface ContributionMetadata extends Base, Extensible {
+    
+    /**
+     * Returns the spec version of the contribution metadata used to build this model
+     *
+     * @return the spec version used to build this model
+     */
+    String getSpecVersion();
+
+    /**
+     * Sets the spec version of the contribution metadata used to build this model
+     *
+     * @param specVersion the spec version used to build this model
+     */
+    void setSpecVersion(String specVersion);
+
+    /**
+     * Returns a list of exports based on the contribution metadata.
+     *
+     * @return The list of exports
+     */
+    List<Export> getExports();
+
+    /**
+     * Returns a list of imports based on the contribution metadata.
+     *
+     * @return The list of imports
+     */
+    List<Import> getImports();
+
+    /**
+     * Returns the list of deployable based on the contribution metadata.
+     *
+     * @return The list of deployable composites
+     */
+    List<Composite> getDeployables();
+
+}
\ No newline at end of file
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/DefaultContributionFactory.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/DefaultContributionFactory.java
new file mode 100644
index 0000000000..98954c288a
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/DefaultContributionFactory.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.contribution;
+
+import org.apache.tuscany.sca.contribution.impl.ContributionFactoryImpl;
+
+
+/**
+ * Default implementation of a contribution model factory.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class DefaultContributionFactory extends ContributionFactoryImpl {
+    
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/DefaultExport.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/DefaultExport.java
new file mode 100644
index 0000000000..b2eddb8336
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/DefaultExport.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.contribution;
+
+
+/**
+ * The representation of an export that exports all artifacts in
+ * a contribution.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface DefaultExport extends Export {
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/DefaultImport.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/DefaultImport.java
new file mode 100644
index 0000000000..4b3d157554
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/DefaultImport.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.contribution;
+
+
+/**
+ * The representation of a default import that imports artifacts from
+ * all contributions.
+ * 
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.asclient
+ */
+public interface DefaultImport extends Import {
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/Export.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/Export.java
new file mode 100644
index 0000000000..a6e5afe7b8
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/Export.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.contribution;
+
+import org.apache.tuscany.sca.assembly.Extensible;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+
+/**
+ * The representation of an export.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface Export extends Extensible {
+
+    /**
+     * Returns the model resolver for the models representing artifacts
+     * made available by this export.
+     *
+     * @return The model resolver
+     */
+    ModelResolver getModelResolver();
+
+    /**
+     * Sets the model resolver for the models representing artifacts
+     * made available by this export.
+     *
+     * @param modelResolver
+     */
+    void setModelResolver(ModelResolver modelResolver);
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/Import.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/Import.java
new file mode 100644
index 0000000000..450476b79b
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/Import.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.contribution;
+
+import org.apache.tuscany.sca.assembly.Extensible;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+
+
+/**
+ * The representation of an import.
+ *
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.asclient
+ */
+public interface Import extends Extensible {
+
+    /**
+     * Returns the model resolver for the models representing artifacts
+     * made available by this import.
+     *
+     * @return The model resolver
+     */
+    ModelResolver getModelResolver();
+
+    /**
+     * Sets the model resolver for the models representing artifacts
+     * made available by this import.
+     *
+     * @param modelResolver The model resolver
+     */
+    void setModelResolver(ModelResolver modelResolver);
+
+    /**
+     * Verify that a specific export actually exports what is being imported.
+     *
+     * @param export The Exported being verified
+     * @return true/false
+     */
+    boolean match(Export export);
+
+}
\ No newline at end of file
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/PackageType.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/PackageType.java
new file mode 100644
index 0000000000..c6c0aff737
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/PackageType.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.contribution;
+
+/**
+ * Constants for the main supported contribution package types.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface PackageType {
+
+    /**
+     * Java compressed contribution package
+     */
+    String JAR = "application/java-archive";
+
+    /**
+     * Zip archive contribution package
+     */
+    String ZIP = "application/zip";
+
+    /**
+     * Filesystem folder contribution package
+     */
+    String FOLDER = "application/vnd.tuscany.folder";
+
+
+    String BUNDLE = "application/osgi.bundle";
+
+    /**
+     * Java EE Web Application Archive
+     */
+    String WAR = "application/war";
+
+    /**
+     * Java EE Enterprise Application Archive
+     */
+    String EAR = "application/ear";
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/impl/ArtifactImpl.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/impl/ArtifactImpl.java
new file mode 100644
index 0000000000..a362e97fc6
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/impl/ArtifactImpl.java
@@ -0,0 +1,94 @@
+/*
+ * 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.contribution.impl;
+
+import org.apache.tuscany.sca.contribution.Artifact;
+
+
+/**
+ * The model representing an artifact in a contribution.
+ *
+ * @version $Rev$ $Date$
+ */
+class ArtifactImpl implements Artifact {
+    private String uri;
+    private String location;
+    private Object model;
+    private boolean unresolved;
+
+    ArtifactImpl() {
+    }
+
+    public String getLocation() {
+        return location;
+    }
+
+    public void setLocation(String location) {
+        this.location = location;
+    }
+
+    public String getURI() {
+        return uri;
+    }
+
+    public void setURI(String uri) {
+        this.uri = uri;
+    }
+
+    public <T> T getModel() {
+        return (T) model;
+    }
+
+    public void setModel(Object model) {
+        this.model = model;
+    }
+
+    public boolean isUnresolved() {
+        return unresolved;
+    }
+
+    public void setUnresolved(boolean unresolved) {
+        this.unresolved = unresolved;
+    }
+
+    @Override
+    public int hashCode() {
+        return uri.hashCode();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        } else {
+            if (obj instanceof Artifact) {
+                return uri.equals(((Artifact)obj).getURI());
+            } else {
+                return false;
+            }
+        }
+    }
+
+    @Override
+    public String toString() {
+    	return "Artifact:" + uri + "\n" +
+    	       "at: " + location;
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/impl/ContributionFactoryImpl.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/impl/ContributionFactoryImpl.java
new file mode 100644
index 0000000000..64bfb20bed
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/impl/ContributionFactoryImpl.java
@@ -0,0 +1,60 @@
+/*
+ * 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.contribution.impl;
+
+import org.apache.tuscany.sca.contribution.Artifact;
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.ContributionFactory;
+import org.apache.tuscany.sca.contribution.ContributionMetadata;
+import org.apache.tuscany.sca.contribution.DefaultExport;
+import org.apache.tuscany.sca.contribution.DefaultImport;
+
+
+/**
+ * Default implementation of a contribution model factory.
+ *
+ * @version $Rev$ $Date$
+ */
+public class ContributionFactoryImpl implements ContributionFactory {
+
+    protected ContributionFactoryImpl() {
+    }
+
+    public Contribution createContribution() {
+        return new ContributionImpl();
+    }
+
+    public ContributionMetadata createContributionMetadata() {
+        return new ContributionMetadataImpl();
+    }
+
+    public Artifact createArtifact() {
+        return new ArtifactImpl();
+    }
+
+    public DefaultExport createDefaultExport() {
+        return new DefaultExportImpl();
+    }
+
+    public DefaultImport createDefaultImport() {
+        return new DefaultImportImpl();
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/impl/ContributionImpl.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/impl/ContributionImpl.java
new file mode 100644
index 0000000000..c31763151d
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/impl/ContributionImpl.java
@@ -0,0 +1,158 @@
+/*
+ * 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.contribution.impl;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import org.apache.tuscany.sca.assembly.Composite;
+import org.apache.tuscany.sca.assembly.impl.ExtensibleImpl;
+import org.apache.tuscany.sca.contribution.Artifact;
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.Export;
+import org.apache.tuscany.sca.contribution.Import;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+
+/**
+ * The representation of a deployed contribution
+ *
+ * @version $Rev$ $Date$
+ */
+class ContributionImpl extends ExtensibleImpl implements Contribution {
+    private String uri;
+    private String location;
+    private Object model;
+    private byte[] contents;
+    private List<Export> exports = new ArrayList<Export>();
+    private List<Import> imports = new ArrayList<Import>();
+    private List<Composite> deployables = new ArrayList<Composite>();
+    private List<Artifact> artifacts = new ArrayList<Artifact>();
+    private List<Contribution> dependencies = new ArrayList<Contribution>();
+    private ModelResolver modelResolver;
+    private Set<String> types = new HashSet<String>();
+
+    // FIXME remove this dependency on Java ClassLoaders
+    private ClassLoader classLoader;
+
+    ContributionImpl() {
+    }
+
+    public String getLocation() {
+        return this.location;
+    }
+
+    public void setLocation(String location) {
+        this.location = location;
+    }
+
+    //FIXME Remove dependency on Java ClassLoaders
+    public ClassLoader getClassLoader() {
+        return classLoader;
+    }
+
+    //FIXME Remove dependency on Java ClassLoaders
+    public void setClassLoader(ClassLoader classLoader) {
+        this.classLoader = classLoader;
+    }
+
+
+    public String getURI() {
+        return this.uri;
+    }
+
+    public void setURI(String uri) {
+        this.uri = uri;
+    }
+
+    public <T> T getModel() {
+        return (T) model;
+    }
+
+    public void setModel(Object model) {
+        this.model = model;
+    }
+
+    public byte[] getContents() {
+        return contents;
+    }
+
+    public void setContents(byte[] contents) {
+        this.contents = contents;
+    }
+
+    public ModelResolver getModelResolver() {
+        return modelResolver;
+    }
+
+    public void setModelResolver(ModelResolver modelResolver) {
+        this.modelResolver = modelResolver;
+    }
+
+    public List<Contribution> getDependencies() {
+        return dependencies;
+    }
+
+    public List<Export> getExports() {
+        return exports;
+    }
+
+    public List<Import> getImports() {
+        return imports;
+    }
+
+    public List<Composite> getDeployables() {
+        return deployables;
+    }
+
+    public List<Artifact> getArtifacts() {
+        return artifacts;
+    }
+
+    @Override
+    public int hashCode() {
+        return uri.hashCode();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        } else {
+            if (obj instanceof Artifact) {
+                return uri.equals(((Artifact)obj).getURI());
+            } else {
+                return false;
+            }
+        }
+    }
+
+    @Override
+    public String toString() {
+    	return "Contribution : " + uri + " \n" +
+    	       "from: " + location;
+    }
+
+    public Set<String> getTypes() {
+        return types;
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/impl/ContributionMetadataImpl.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/impl/ContributionMetadataImpl.java
new file mode 100644
index 0000000000..e2397c6f26
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/impl/ContributionMetadataImpl.java
@@ -0,0 +1,74 @@
+/*
+ * 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.contribution.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.Composite;
+import org.apache.tuscany.sca.assembly.impl.ExtensibleImpl;
+import org.apache.tuscany.sca.contribution.ContributionMetadata;
+import org.apache.tuscany.sca.contribution.Export;
+import org.apache.tuscany.sca.contribution.Import;
+
+/**
+ * The representation of a deployed contribution
+ *
+ * @version $Rev$ $Date$
+ */
+class ContributionMetadataImpl extends ExtensibleImpl implements ContributionMetadata {
+
+    private String specVersion = "undefined";
+    private List<Export> exports = new ArrayList<Export>();
+    private List<Import> imports = new ArrayList<Import>();
+    private List<Composite> deployables = new ArrayList<Composite>();
+    private boolean unresolved;
+    
+    ContributionMetadataImpl() {
+    }
+
+    public String getSpecVersion() {
+        return specVersion;
+    }
+
+    public void setSpecVersion(String specVersion) {
+        this.specVersion = specVersion;
+    }
+
+    public List<Export> getExports() {
+        return exports;
+    }
+
+    public List<Import> getImports() {
+        return imports;
+    }
+
+    public List<Composite> getDeployables() {
+        return deployables;
+    }
+
+    public boolean isUnresolved() {
+        return unresolved;
+    }
+
+    public void setUnresolved(boolean unresolved) {
+        this.unresolved = unresolved;
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/impl/DefaultExportImpl.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/impl/DefaultExportImpl.java
new file mode 100644
index 0000000000..d4614e5427
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/impl/DefaultExportImpl.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.contribution.impl;
+
+import org.apache.tuscany.sca.assembly.impl.ExtensibleImpl;
+import org.apache.tuscany.sca.contribution.DefaultExport;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+
+/**
+ * The representation of an export for the contribution
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefaultExportImpl extends ExtensibleImpl implements DefaultExport {
+    private ModelResolver modelResolver;
+
+    protected DefaultExportImpl() {
+        super();
+    }
+
+    public ModelResolver getModelResolver() {
+        return modelResolver;
+    }
+
+    public void setModelResolver(ModelResolver modelResolver) {
+        this.modelResolver = modelResolver;
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/impl/DefaultImportImpl.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/impl/DefaultImportImpl.java
new file mode 100644
index 0000000000..7ab535f916
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/impl/DefaultImportImpl.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.contribution.impl;
+
+import org.apache.tuscany.sca.assembly.impl.ExtensibleImpl;
+import org.apache.tuscany.sca.contribution.DefaultExport;
+import org.apache.tuscany.sca.contribution.DefaultImport;
+import org.apache.tuscany.sca.contribution.Export;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+
+/**
+ * The representation of an import for the contribution
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefaultImportImpl extends ExtensibleImpl implements DefaultImport {
+    private ModelResolver modelResolver;
+
+    protected DefaultImportImpl() {
+        super();
+    }
+
+    public ModelResolver getModelResolver() {
+        return modelResolver;
+    }
+
+    public void setModelResolver(ModelResolver modelResolver) {
+        this.modelResolver = modelResolver;
+    }
+
+
+    public boolean match(Export export) {
+        if (export instanceof DefaultExport) {
+            return true;
+        }
+        return false;
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/DefaultJavaImportExportFactory.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/DefaultJavaImportExportFactory.java
new file mode 100644
index 0000000000..886c61c00a
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/DefaultJavaImportExportFactory.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.contribution.java;
+
+import org.apache.tuscany.sca.contribution.java.impl.JavaImportExportFactoryImpl;
+
+/**
+ * Default Java Import/Export Factory implementation
+ * 
+ * @version $Rev$ $Date$
+ */
+public class DefaultJavaImportExportFactory extends JavaImportExportFactoryImpl implements JavaImportExportFactory {
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/JavaExport.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/JavaExport.java
new file mode 100644
index 0000000000..41e93ec148
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/JavaExport.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.contribution.java;
+
+import org.apache.tuscany.sca.contribution.Export;
+
+/**
+ * Base Java Export model interface
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface JavaExport extends Export {
+    /**
+     * Get java package that identifies the import
+     * 
+     * @return The package name
+     */
+    String getPackage();
+
+    /**
+     * Set java package that identifies the import
+     * 
+     * @param packageName The package name
+     */
+    void setPackage(String packageName);
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/JavaImport.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/JavaImport.java
new file mode 100644
index 0000000000..d3568f6283
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/JavaImport.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.contribution.java;
+
+import org.apache.tuscany.sca.contribution.Import;
+
+/**
+ * Base Java Import model interface
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface JavaImport extends Import {
+
+    /**
+     * Get the location used to resolve the definitions for this import
+     * 
+     * @return The import location
+     */
+    String getLocation();
+
+    /**
+     * Set the location used to resolve the definitions for this import
+     * 
+     * @param location The import location
+     */
+    void setLocation(String location);
+
+    /**
+     * Get java package that identifies the import
+     * 
+     * @return The package name
+     */
+    String getPackage();
+
+    /**
+     * Set java package that identifies the import
+     * 
+     * @param packageName The package name
+     */
+    void setPackage(String packageName);
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/JavaImportExportFactory.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/JavaImportExportFactory.java
new file mode 100644
index 0000000000..ee94d889ad
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/JavaImportExportFactory.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.contribution.java;
+
+/**
+ * Base Java Import/Export model factory
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface JavaImportExportFactory {
+
+    /**
+     * Create a java import model object
+     * 
+     * @return The new JavaImport model object
+     */
+    JavaImport createJavaImport();
+    
+    /**
+     * Create a java export model object
+     * 
+     * @return The new JavaExport model object
+     */
+    JavaExport createJavaExport();
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ClassLoaderModelResolver.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ClassLoaderModelResolver.java
new file mode 100644
index 0000000000..1ba394dde9
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ClassLoaderModelResolver.java
@@ -0,0 +1,182 @@
+/*
+ * 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.contribution.java.impl;
+
+import java.io.IOException;
+import java.lang.ref.WeakReference;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.Import;
+import org.apache.tuscany.sca.contribution.java.JavaImport;
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+import org.apache.tuscany.sca.contribution.resolver.ClassReference;
+import org.apache.tuscany.sca.contribution.resolver.DefaultDelegatingModelResolver;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
+
+/**
+ * A Model Resolver for ClassReferences.
+ *
+ * @version $Rev$ $Date$
+ */
+public class ClassLoaderModelResolver extends URLClassLoader implements ModelResolver {
+    private WeakReference<Contribution> contribution;
+    private ProcessorContext context;
+    private Map<String, ModelResolver> importResolvers = new HashMap<String, ModelResolver>();
+    
+    // a space to pass back the contribution that was used to resolve
+    // a class via an import
+    private Contribution contributionContainingClass;
+
+    private static ClassLoader parentClassLoader(Contribution contribution) {
+        if (contribution.getClassLoader() != null) {
+            return contribution.getClassLoader();
+        }
+        ClassLoader parentClassLoader = ServiceDiscovery.getInstance().getContextClassLoader();
+        return parentClassLoader;
+    }
+
+    private static URL[] getContributionURLs(final Contribution contribution) throws IOException {
+        if (contribution.getClassLoader() != null) {
+            // Do not include the contribution url
+            return new URL[0];
+        }
+        List<URL> urls = new ArrayList<URL>();
+        urls.add(new URL(contribution.getLocation()));
+        urls.addAll(ContributionHelper.getNestedJarUrls(contribution));
+        return urls.toArray(new URL[urls.size()]);
+    }
+
+    public ClassLoaderModelResolver(final Contribution contribution, FactoryExtensionPoint modelFactories) throws IOException {
+        super(getContributionURLs(contribution), parentClassLoader(contribution));
+        this.contribution = new WeakReference<Contribution>(contribution);
+        // Index Java import resolvers by package name
+        Map<String, List<ModelResolver>> resolverMap = new HashMap<String, List<ModelResolver>>();
+        for (Import import_: this.contribution.get().getImports()) {
+            if (import_ instanceof JavaImport) {
+                JavaImport javaImport = (JavaImport)import_;
+                List<ModelResolver> resolvers = resolverMap.get(javaImport.getPackage());
+                if (resolvers == null) {
+                    resolvers = new ArrayList<ModelResolver>();
+                    resolverMap.put(javaImport.getPackage(), resolvers);
+                }
+                resolvers.add(javaImport.getModelResolver());
+            }
+        }
+
+        // Create a delegating model resolver for each imported package
+        for (Map.Entry<String, List<ModelResolver>> entry: resolverMap.entrySet()) {
+            importResolvers.put(entry.getKey(), new DefaultDelegatingModelResolver(entry.getValue()));
+        }
+    }
+
+    public void addModel(Object resolved, ProcessorContext context) {
+        throw new IllegalStateException();
+    }
+
+    public Object removeModel(Object resolved, ProcessorContext context) {
+        throw new IllegalStateException();
+    }
+
+    public <T> T resolveModel(Class<T> modelClass, T unresolved, ProcessorContext context) {
+        if (!(unresolved instanceof ClassReference)) {
+            return unresolved;
+        }
+
+        try {
+            this.context = context;
+            contributionContainingClass = contribution.get();
+            
+            // Load the class and return a class reference for it
+            String className = ((ClassReference)unresolved).getClassName();
+            Class<?> clazz = Class.forName(className, false, this);
+            ClassReference classReference = new ClassReference(clazz);
+            classReference.setContributionContainingClass(contributionContainingClass);
+            contributionContainingClass = null;
+            return modelClass.cast(classReference);
+
+        } catch (ClassNotFoundException e) {
+            return unresolved;
+        }
+    }
+
+    @Override
+    public URL findResource(String name) {
+
+        //TODO delegate to the Java import resolvers
+
+        URL url = super.findResource(name);
+        return url;
+    }
+
+    @Override
+    public Enumeration<URL> findResources(String name) throws IOException {
+
+        //TODO delegate to the Java import resolvers
+        //Enumeration<URL> importedResources;
+
+        Enumeration<URL> resources = super.findResources(name);
+        List<URL> allResources = new ArrayList<URL>();
+        //for (; importedResources.hasMoreElements(); ) {
+        //    allResources.add(importedResources.nextElement());
+        //}
+        for (; resources.hasMoreElements(); ) {
+            allResources.add(resources.nextElement());
+        }
+        return Collections.enumeration(allResources);
+    }
+
+    @Override
+    protected Class<?> findClass(String name) throws ClassNotFoundException {
+
+        // Extract the package name
+        int d = name.lastIndexOf('.');
+        String packageName;
+        if (d != -1) {
+            packageName = name.substring(0, d);
+        } else {
+            packageName = null;
+        }
+
+        // First try to load the class using the Java import resolvers
+        ModelResolver importResolver = importResolvers.get(packageName);
+        if (importResolver != null) {
+            ClassReference classReference = importResolver.resolveModel(ClassReference.class, new ClassReference(name), context);
+            if (!classReference.isUnresolved()) {
+                contributionContainingClass = classReference.getContributionContainingClass();
+                return classReference.getJavaClass();
+            }
+        }
+
+        // Next, try to load the class from the current contribution
+        Class<?> clazz = super.findClass(name);
+        return clazz;
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ContributionClassLoader.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ContributionClassLoader.java
new file mode 100644
index 0000000000..25b3eae350
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ContributionClassLoader.java
@@ -0,0 +1,386 @@
+/*
+ * 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.contribution.java.impl;
+
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Enumeration;
+import java.util.HashSet;
+
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.Export;
+import org.apache.tuscany.sca.contribution.Import;
+import org.apache.tuscany.sca.contribution.java.JavaImport;
+
+
+public class ContributionClassLoader extends URLClassLoader {
+// public class ContributionClassLoader  {
+    
+    private Contribution contribution;
+    // private b urlClassLoader;
+    
+    /**
+     * Constructor for contribution ClassLoader 
+     * 
+     * @param contribution
+     * @param parent
+     * @throws MalformedURLException
+     */
+    public ContributionClassLoader(Contribution contribution, final ClassLoader parent) {
+        super(new URL[0], parent);
+        // Note that privileged use of getContextClassLoader have been promoted to callers.
+        // super(new URL[0], parent == null?Thread.currentThread().getContextClassLoader(): null);
+        this.contribution = contribution;
+        if (contribution.getLocation() != null) {
+            try {
+                this.addURL(new URL(contribution.getLocation()));
+                for (URL url : ContributionHelper.getNestedJarUrls(contribution)) {
+                    this.addURL(url);
+                }
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
+
+    /*
+     * Return the ClassLoader corresponding to a contribution providing an export
+     * Create a new ClassLoader for the contribution if one does not exist
+     */
+    private ClassLoader getExportClassLoader(Contribution exportingContribution) {
+    	ClassLoader cl = exportingContribution.getClassLoader();
+        if (!(cl instanceof ContributionClassLoader)) {
+            if (cl == null) {
+                cl = getParent();
+            }
+
+            cl = new ContributionClassLoader(exportingContribution, cl);
+            exportingContribution.setClassLoader(cl);
+        }
+        return cl;
+    }
+    
+    /* (non-Javadoc)
+     * @see java.net.URLClassLoader#findClass(java.lang.String)
+     * 
+     * Search path for class:
+     *     This contribution
+     *     Imported contributions
+     */
+    @Override   
+    protected Class<?> findClass(String className) throws ClassNotFoundException {
+        
+        Class<?> clazz = null;
+        try {
+            clazz = findClassFromContribution(className);
+        } catch (ClassNotFoundException e) {
+                
+            for (Import import_ : this.contribution.getImports()) {
+                if (classNameMatchesImport(className, import_)) {
+                    // Delegate the resolution to the imported contribution
+                    for (Contribution exportingContribution : ((JavaImportModelResolver)import_.getModelResolver()).getExportContributions()) {
+                                    
+                        ClassLoader exportClassLoader = getExportClassLoader(exportingContribution);
+                        if (exportClassLoader instanceof ContributionClassLoader) {
+                            
+                            for (Export export : exportingContribution.getExports()) {
+                                try {
+                                    if (import_.match(export)) {
+                                        clazz = ((ContributionClassLoader)exportClassLoader).findClassFromContribution(className);
+                                        break;
+                                    }
+                                } catch (ClassNotFoundException e1) { 
+                                    continue;
+                                }
+                                    
+                            }
+                            if (clazz != null)  break;
+                        }
+                    }
+                    if (clazz != null) break;
+                }
+            }
+
+            if (clazz == null) throw e;
+        }
+        return clazz;
+    }
+
+    
+    /* (non-Javadoc)
+     * @see java.lang.ClassLoader#loadClass(java.lang.String, boolean)
+     * 
+     * Search path for class:
+     *     Parent ClassLoader
+     *     This contribution
+     *     Imported contributions
+     *     
+     */
+    @Override
+    protected synchronized Class<?> loadClass(String className, boolean resolveClass) 
+        throws ClassNotFoundException {
+       
+        Class<?> clazz = null;
+        try {
+            
+            if (this.getParent() != null)
+                clazz = this.getParent().loadClass(className);
+            
+        } catch (ClassNotFoundException e) {
+        }
+
+        if (clazz == null)
+            clazz = findClass(className);
+
+
+        if (resolveClass)
+            this.resolveClass(clazz);
+        return clazz;
+        
+    }
+
+
+   
+    /*
+     * (non-Javadoc)
+     * 
+     * @see java.net.URLClassLoader#findResource(java.lang.String)
+     */
+    @Override
+    public URL findResource(String name) {
+        
+        URL url = findResourceFromContribution(name);
+        
+        if (url == null) {
+            for (Import import_ : this.contribution.getImports()) {
+                if (resourceNameMatchesImport(name, import_)) {
+                    // Delegate the resolution to the imported contribution
+                    for (Contribution exportingContribution : ((JavaImportModelResolver)import_.getModelResolver()).getExportContributions()) {
+                                
+                        ClassLoader exportClassLoader = getExportClassLoader(exportingContribution);
+                        if (exportClassLoader instanceof ContributionClassLoader) {
+
+                            for (Export export : exportingContribution.getExports()) {
+                                if (import_.match(export)) {
+                                    url = ((ContributionClassLoader)exportClassLoader).findResourceFromContribution(name);
+                                    if (url != null) break;
+                                }
+                            }
+                            if (url != null)  break;
+                        }
+                    }
+                    if (url != null) break;
+                }
+            }
+
+        }
+        return url;
+    }
+
+
+    /* (non-Javadoc)
+     * @see java.net.URLClassLoader#findResources(java.lang.String)
+     */
+    @Override
+    public Enumeration<URL> findResources(String name) throws IOException {
+              
+        return Collections.enumeration(findResourceSet(name));
+    }
+    
+    
+
+    
+    /* (non-Javadoc)
+     * @see java.lang.ClassLoader#getResource(java.lang.String)
+     * 
+     * Find a resource. 
+     * Search path for resource:
+     *     Parent ClassLoader
+     *     This contribution
+     *     Imported contributions
+     */
+    @Override
+    public URL getResource(String resName) {
+ 
+        URL resource  = null;
+        
+        if (this.getParent() != null) {
+            resource  = this.getParent().getResource(resName);
+        }        
+        if (resource == null)
+            resource  = findResource(resName);
+        
+        return resource;
+    }
+
+
+    
+    /* (non-Javadoc)
+     * @see java.lang.ClassLoader#getResources(java.lang.String)
+     * 
+     * Return list of resources from this contribution, resources
+     * imported through imported contributions and resources from parent 
+     * ClassLoader.
+     */
+    @Override
+    public Enumeration<URL> getResources(String resName) throws IOException {
+       
+        HashSet<URL> resourceSet = findResourceSet(resName);
+        addEnumerationToCollection(resourceSet, super.getResources(resName));
+        
+        return Collections.enumeration(resourceSet);
+    }
+    
+
+    /*
+     * Find set of resources
+     */
+    private HashSet<URL> findResourceSet(String name) throws IOException {
+        
+        HashSet<URL> resources = new HashSet<URL>();
+
+        addEnumerationToCollection(resources, super.findResources(name));
+        
+        for (Import import_ : this.contribution.getImports()) {
+            if (!(import_ instanceof JavaImport)) {
+                continue;
+            }
+            if (resourceNameMatchesImport(name, import_)) {
+                // Delegate the resolution to the imported contribution
+                for (Contribution exportingContribution : ((JavaImportModelResolver)import_.getModelResolver()).getExportContributions()) {
+                                
+                    ClassLoader exportClassLoader = getExportClassLoader(exportingContribution);
+                    if (exportClassLoader instanceof ContributionClassLoader) {
+
+                        for (Export export : exportingContribution.getExports()) {
+                            if (import_.match(export)) {
+                                addEnumerationToCollection(resources,
+                                        ((ContributionClassLoader)exportClassLoader).findResources(name));
+                            }
+                        }
+                    }
+                }
+            }
+         }
+
+        return resources;
+    }
+
+
+    /*
+     * Find class from contribution. If class has already been loaded, return loaded class.
+     */
+    private Class<?> findClassFromContribution(String className) throws ClassNotFoundException {
+        
+        Class<?> clazz = findLoadedClass(className);
+        if (clazz == null)
+            clazz =  super.findClass(className);
+        return clazz;
+       
+    }
+    
+    /*
+     * Find resource from contribution.
+     */
+    private URL findResourceFromContribution(String name) {
+        
+        return super.findResource(name);
+    }
+    
+    /**
+     * Check if a class name matches an import statement.
+     * Class matches if the package name used in <import.java/> matches
+     * 
+     * @param name    Name of class 
+     * @param import_ SCA contribution import
+     * @return true if this is a matching import
+     */
+    private boolean classNameMatchesImport(String name, Import import_) {
+        
+        if (import_ instanceof JavaImport && name != null && name.lastIndexOf('.') > 0) {
+            JavaImport javaImport = (JavaImport) import_;
+                
+            String packageName = name.substring(0, name.lastIndexOf('.'));
+            if (javaImport.getPackage().endsWith(".*")) {
+                String prefix = javaImport.getPackage().substring(0, javaImport.getPackage().length() -1);
+                 if (packageName.startsWith(prefix)) {
+                    return true;
+                }
+            } else {
+                return packageName.equals(javaImport.getPackage());
+            }
+        }
+        
+        return false;
+    }
+    
+    /**
+     * Check if a resource name matches an import statement.
+     * Resource matches if package/namespace match the directory of resource.
+     * 
+     * @param name    Name of resource
+     * @param import_ SCA contribution import
+     * @return true if this is a matching import
+     */
+    private boolean resourceNameMatchesImport(String name, Import import_) {
+        
+       
+        if (name == null || name.lastIndexOf('/') <= 0)
+            return false;
+        else if (import_ instanceof JavaImport) {
+            JavaImport javaImport = (JavaImport) import_;
+            
+            if (javaImport.getPackage().endsWith(".*")) {
+                String packageName = name.substring(0, name.lastIndexOf('/')).replace('/', '.');
+                String prefix = javaImport.getPackage().substring(0, javaImport.getPackage().length() -1);
+                if (packageName.startsWith(prefix)) {
+                    return true;
+                }
+            } else {
+                // 'name' is a resource : contains "/" as separators
+                // Get package name from resource name
+                String packageName = name.substring(0, name.lastIndexOf('/'));
+                 return packageName.equals(javaImport.getPackage().replaceAll("\\.", "/"));
+            }
+        } 
+        return false;
+    }
+    
+    /*
+     * Add an enumeration to a Collection
+     */
+    private <T extends Object> void addEnumerationToCollection(Collection<T> collection, Enumeration<T> enumeration) {
+        
+        while (enumeration.hasMoreElements())
+            collection.add(enumeration.nextElement());
+    }
+    
+    
+    @Override
+    public String toString() {
+        return "SCA Contribution ClassLoader location: " + contribution.getLocation() + " parent ClassLoader: " + getParent();
+    }
+    
+    
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ContributionHelper.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ContributionHelper.java
new file mode 100644
index 0000000000..be175d000e
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ContributionHelper.java
@@ -0,0 +1,96 @@
+/*
+ * 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.contribution.java.impl;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.net.URI;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipInputStream;
+
+import org.apache.tuscany.sca.contribution.Artifact;
+import org.apache.tuscany.sca.contribution.Contribution;
+
+public class ContributionHelper {
+
+    public static List<URL> getNestedJarUrls(final Contribution contribution) throws IOException {
+        List<URL> urls = new ArrayList<URL>();
+        boolean isZipContribution = contribution.getLocation().endsWith(".zip");
+        URI uri = URI.create(contribution.getLocation());
+        boolean isFolderContribution = !isZipContribution && uri.getScheme().equals("file") && new File(uri.getSchemeSpecificPart()).isDirectory();
+        if (isZipContribution || isFolderContribution) {
+            for (Artifact a : contribution.getArtifacts()) {
+                if (a.getLocation().endsWith(".jar")) {
+                    if (isZipContribution) {
+                        urls.add(createTempJar(a, contribution));
+                    } else {
+                        urls.add(new URL(a.getLocation()));
+                    }
+                }
+            }
+        }
+        return urls;
+    }
+
+    /**
+     * URLClassLoader doesn't seem to work with URLs to jars within an archive so as a work around
+     * copy the jar to a temp file and use the url to that.
+     */
+    private static URL createTempJar(Artifact artifact, Contribution contribution) throws IOException {
+        FileOutputStream fileOutputStream = null;
+        ZipInputStream zipInputStream = new ZipInputStream(new FileInputStream(new File(URI.create(contribution.getLocation()))));
+        try {
+            ZipEntry zipEntry = zipInputStream.getNextEntry();
+            while (zipEntry != null) {
+                if (artifact.getLocation().endsWith(zipEntry.getName())) {
+
+                    String tempName = ("tmp." + artifact.getURI().substring(0, artifact.getURI().length() - 3)).replace('/', '.');
+                    File tempFile = File.createTempFile(tempName, ".jar");
+                    tempFile.deleteOnExit();
+                    fileOutputStream = new FileOutputStream(tempFile);
+
+                    byte[] buf = new byte[2048];
+                    int n;
+                    while ((n = zipInputStream.read(buf, 0, buf.length)) > -1) {
+                        fileOutputStream.write(buf, 0, n);
+                    }
+
+                    fileOutputStream.close();
+                    zipInputStream.closeEntry();
+
+                    return tempFile.toURI().toURL();
+
+                }
+                zipEntry = zipInputStream.getNextEntry();
+            }
+        } finally {
+            zipInputStream.close();
+            if (fileOutputStream != null) {
+                fileOutputStream.close();
+            }
+        }
+        
+        throw new IllegalStateException();
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/JavaExportImpl.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/JavaExportImpl.java
new file mode 100644
index 0000000000..c0bd9465e4
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/JavaExportImpl.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.contribution.java.impl;
+
+import org.apache.tuscany.sca.assembly.impl.ExtensibleImpl;
+import org.apache.tuscany.sca.contribution.java.JavaExport;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+
+/**
+ * Implementation of a Java Import model
+ *
+ * @version $Rev$ $Date$
+ */
+public class JavaExportImpl extends ExtensibleImpl implements JavaExport {
+    private ModelResolver modelResolver;
+
+    /**
+     * Java package being exported
+     */
+    private String packageName;
+
+    public JavaExportImpl() {
+        super();
+    }
+
+    public String getPackage() {
+        return this.packageName;
+    }
+
+    public void setPackage(String packageName) {
+        this.packageName = packageName;
+    }
+
+    public ModelResolver getModelResolver() {
+        return modelResolver;
+    }
+
+    public void setModelResolver(ModelResolver modelResolver) {
+        this.modelResolver = modelResolver;
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/JavaExportModelResolver.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/JavaExportModelResolver.java
new file mode 100644
index 0000000000..9b02ce4abb
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/JavaExportModelResolver.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.contribution.java.impl;
+
+import org.apache.tuscany.sca.contribution.java.JavaExport;
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+import org.apache.tuscany.sca.contribution.resolver.ClassReference;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+
+/**
+ * A model resolver for Java exports.
+ *
+ * @version $Rev$ $Date$
+ */
+public class JavaExportModelResolver implements ModelResolver {
+
+    private JavaExport export;
+    private ModelResolver resolver;
+    
+    public JavaExportModelResolver(JavaExport export, ModelResolver resolver) {
+        this.export = export;
+        this.resolver = resolver;
+    }
+    
+    public void addModel(Object resolved, ProcessorContext context) {
+        throw new IllegalStateException();
+    }
+
+    public Object removeModel(Object resolved, ProcessorContext context) {
+        throw new IllegalStateException();
+    }
+
+    public <T> T resolveModel(Class<T> modelClass, T unresolved, ProcessorContext context) {
+        if (!(unresolved instanceof ClassReference)) {
+            return unresolved;
+        }
+        
+        // Filter package name
+        ClassReference classReference = (ClassReference)unresolved;
+        String className = classReference.getClassName();
+        int d = className.lastIndexOf('.');
+        String packageName;
+        if (d != -1) {
+            packageName = className.substring(0, d);
+        } else {
+            packageName = "";
+        }
+        if (export.getPackage().equals(packageName)) {
+            
+            // Package matches the exported package, delegate to the
+            // contribution's resolver
+            return resolver.resolveModel(modelClass, unresolved, context);
+        } else {
+            
+            // Package is not exported, return the unresolved object 
+            return unresolved;
+        }
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/JavaExportProcessor.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/JavaExportProcessor.java
new file mode 100644
index 0000000000..bfa89d02fe
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/JavaExportProcessor.java
@@ -0,0 +1,147 @@
+/*
+ * 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.contribution.java.impl;
+
+import static javax.xml.stream.XMLStreamConstants.START_ELEMENT;
+
+import javax.xml.namespace.QName;
+import javax.xml.stream.XMLStreamConstants;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+import javax.xml.stream.XMLStreamWriter;
+
+import org.apache.tuscany.sca.contribution.java.JavaExport;
+import org.apache.tuscany.sca.contribution.java.JavaImportExportFactory;
+import org.apache.tuscany.sca.contribution.processor.ContributionReadException;
+import org.apache.tuscany.sca.contribution.processor.ContributionResolveException;
+import org.apache.tuscany.sca.contribution.processor.ContributionWriteException;
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.monitor.Problem;
+import org.apache.tuscany.sca.monitor.Problem.Severity;
+
+/**
+ * Artifact processor for Java Export
+ * 
+ * @version $Rev$ $Date$
+ */
+public class JavaExportProcessor implements StAXArtifactProcessor<JavaExport> {
+    private static final String SCA11_NS = "http://docs.oasis-open.org/ns/opencsa/sca/200912";
+    
+    private static final QName EXPORT_JAVA = new QName(SCA11_NS, "export.java");
+    
+    private static final String PACKAGE = "package";
+    
+    private final JavaImportExportFactory factory;
+    
+    public JavaExportProcessor(FactoryExtensionPoint modelFactories) {
+        super();
+        this.factory = modelFactories.getFactory(JavaImportExportFactory.class);
+    }
+    
+    /**
+     * Report a error.
+     * 
+     * @param problems
+     * @param message
+     * @param model
+     */
+     private void error(Monitor monitor, String message, Object model, Object... messageParameters) {
+    	 if (monitor != null) {
+	        Problem problem = monitor.createProblem(this.getClass().getName(), "contribution-java-validation-messages", Severity.ERROR, model, message, (Object[])messageParameters);
+	        monitor.problem(problem);
+    	 }
+     }
+     
+    public QName getArtifactType() {
+        return EXPORT_JAVA;
+    }
+    
+    public Class<JavaExport> getModelType() {
+        return JavaExport.class;
+    }
+    
+    /**
+     * Process <export package=""/>
+     */
+    public JavaExport read(XMLStreamReader reader, ProcessorContext context) throws ContributionReadException {
+        JavaExport javaExport = this.factory.createJavaExport();
+        QName element = null;
+        
+        try {
+            while (reader.hasNext()) {
+                int event = reader.getEventType();
+                switch (event) {
+                    case START_ELEMENT:
+                        element = reader.getName();
+                        
+                        // Read <export.java>
+                        if (EXPORT_JAVA.equals(element)) {
+                            String packageName = reader.getAttributeValue(null, PACKAGE);
+                            if (packageName == null) {
+                            	error(context.getMonitor(), "AttributePackageMissing", reader);
+                                //throw new ContributionReadException("Attribute 'package' is missing");
+                            } else                        
+                                javaExport.setPackage(packageName);
+                        }
+                        break;
+                    case XMLStreamConstants.END_ELEMENT:
+                        if (EXPORT_JAVA.equals(reader.getName())) {
+                            return javaExport;
+                        }
+                        break;        
+                }
+                
+                //Read the next element
+                if (reader.hasNext()) {
+                    reader.next();
+                }
+            }
+        }
+        catch (XMLStreamException e) {
+            ContributionReadException ex = new ContributionReadException(e);
+            error(context.getMonitor(), "XMLStreamException", reader, ex);
+        }
+        
+        return javaExport;
+    }
+
+    public void write(JavaExport javaExport, XMLStreamWriter writer, ProcessorContext context) throws ContributionWriteException, XMLStreamException {
+        
+        // Write <export.java>
+        writer.writeStartElement(EXPORT_JAVA.getNamespaceURI(), EXPORT_JAVA.getLocalPart());
+        
+        if (javaExport.getPackage() != null) {
+            writer.writeAttribute(PACKAGE, javaExport.getPackage());
+        }
+        
+        writer.writeEndElement();
+    }
+
+    public void resolve(JavaExport javaExport, ModelResolver resolver, ProcessorContext context) throws ContributionResolveException {
+        
+        if (javaExport.getPackage() != null)
+            // Initialize the export resolver
+            javaExport.setModelResolver(new JavaExportModelResolver(javaExport, resolver));
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/JavaImportExportFactoryImpl.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/JavaImportExportFactoryImpl.java
new file mode 100644
index 0000000000..3bf9e54774
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/JavaImportExportFactoryImpl.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.contribution.java.impl;
+
+import org.apache.tuscany.sca.contribution.java.JavaExport;
+import org.apache.tuscany.sca.contribution.java.JavaImport;
+import org.apache.tuscany.sca.contribution.java.JavaImportExportFactory;
+
+/**
+ * Java Import/Export Factory implementation
+ * 
+ * @version $Rev$ $Date$
+ */
+public class JavaImportExportFactoryImpl implements JavaImportExportFactory {
+
+    public JavaImport createJavaImport() {
+        return new JavaImportImpl();
+    }
+    
+    public JavaExport createJavaExport() {
+        return new JavaExportImpl();
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/JavaImportImpl.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/JavaImportImpl.java
new file mode 100644
index 0000000000..f2fdb3278e
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/JavaImportImpl.java
@@ -0,0 +1,111 @@
+/*
+ * 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.contribution.java.impl;
+
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.impl.ExtensibleImpl;
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.Export;
+import org.apache.tuscany.sca.contribution.java.JavaExport;
+import org.apache.tuscany.sca.contribution.java.JavaImport;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+
+/**
+ * Implementation of a Java Import model
+ *
+ * @version $Rev$ $Date$
+ */
+public class JavaImportImpl extends ExtensibleImpl implements JavaImport {
+    private ModelResolver modelResolver;
+    private List<Contribution> contributions;
+    /**
+     * Java package name being imported
+     */
+    private String packageName;
+    /**
+     * Contribution URI where the artifact is imported from
+     */
+    private String location;
+
+    public JavaImportImpl() {
+        super();
+    }
+
+    public String getLocation() {
+        return this.location;
+    }
+
+    public void setLocation(String location) {
+        this.location = location;
+    }
+
+    public String getPackage() {
+        return this.packageName;
+    }
+
+    public void setPackage(String packageName) {
+        this.packageName = packageName;
+    }
+
+    public ModelResolver getModelResolver() {
+        return this.modelResolver;
+    }
+
+    public void setModelResolver(ModelResolver modelResolver) {
+        this.modelResolver = modelResolver;
+    }
+    public List<Contribution> getExportContributions() {
+        return contributions;
+    }
+
+    public void setExportContributions(List<Contribution> contributions) {
+        this.contributions = contributions;
+    }
+
+    /**
+     * Match a JavaImport to a given JavaExport based on :
+     *    location is not provided
+     *    import and export packages match
+     */
+    public boolean match(Export export) {
+        if(export instanceof JavaExport) {
+            JavaExport javaExport = (JavaExport)export;
+            String exportedPackage = javaExport.getPackage();
+            if (packageName.equals(exportedPackage)) {
+                return true;
+            } else {
+                if (packageName.endsWith(".*")) {
+                    String prefix = packageName.substring(0, packageName.length() - 1);
+                    if (exportedPackage.startsWith(prefix)) {
+                        return true;
+                    }
+                }
+            }
+        }
+
+        return false;
+    }
+
+    @Override
+    public String toString() {
+        return String.valueOf(packageName);
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/JavaImportModelResolver.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/JavaImportModelResolver.java
new file mode 100644
index 0000000000..344e730bdc
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/JavaImportModelResolver.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.contribution.java.impl;
+
+import java.util.List;
+
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+
+/**
+ * A JavaImport specific model resolver. This model resolver is temporary
+ * and provides the ContributionClassLoader with the list of exporting
+ * contributions that it currently needs.
+ * 
+ * FIXME Remove this class after the ContributionClassLoader is simplified
+ * and cleaned up.
+ *
+ * @version $Rev$ $Date$
+ */
+public class JavaImportModelResolver implements ModelResolver {
+
+    private ModelResolver modelResolver;
+    private List<Contribution> contributions;
+    
+    public JavaImportModelResolver(List<Contribution> contributions, ModelResolver modelResolver) {
+        this.modelResolver = modelResolver;
+        this.contributions = contributions;
+    }
+
+    public List<Contribution> getExportContributions() {
+        return contributions;
+    }
+    
+    public void addModel(Object resolved, ProcessorContext context) {
+        modelResolver.addModel(resolved, context);
+    }
+
+    public Object removeModel(Object resolved, ProcessorContext context) {
+        return modelResolver.removeModel(resolved, context);
+    }
+
+    public <T> T resolveModel(Class<T> modelClass, T unresolved, ProcessorContext context) {
+        return modelResolver.resolveModel(modelClass, unresolved, context);
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/JavaImportProcessor.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/JavaImportProcessor.java
new file mode 100644
index 0000000000..a199f6874c
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/JavaImportProcessor.java
@@ -0,0 +1,153 @@
+/*
+ * 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.contribution.java.impl;
+
+import static javax.xml.stream.XMLStreamConstants.START_ELEMENT;
+
+import javax.xml.namespace.QName;
+import javax.xml.stream.XMLStreamConstants;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+import javax.xml.stream.XMLStreamWriter;
+
+import org.apache.tuscany.sca.contribution.java.JavaImport;
+import org.apache.tuscany.sca.contribution.java.JavaImportExportFactory;
+import org.apache.tuscany.sca.contribution.processor.BaseStAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.ContributionReadException;
+import org.apache.tuscany.sca.contribution.processor.ContributionResolveException;
+import org.apache.tuscany.sca.contribution.processor.ContributionWriteException;
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.monitor.Problem;
+import org.apache.tuscany.sca.monitor.Problem.Severity;
+
+/**
+ * Artifact Processor for Java Imports
+ * 
+ * @version $Rev$ $Date$
+ */
+public class JavaImportProcessor extends BaseStAXArtifactProcessor implements StAXArtifactProcessor<JavaImport> {
+    private static final String SCA11_NS = "http://docs.oasis-open.org/ns/opencsa/sca/200912";
+    
+    private static final QName IMPORT_JAVA = new QName(SCA11_NS, "import.java");
+
+    private static final String PACKAGE = "package";
+    private static final String LOCATION = "location";
+    
+    private final JavaImportExportFactory factory;
+    
+    public JavaImportProcessor(FactoryExtensionPoint modelFactories) {
+        super();
+        this.factory = modelFactories.getFactory(JavaImportExportFactory.class);
+    }
+    
+    /**
+     * Report a error.
+     * 
+     * @param problems
+     * @param message
+     * @param model
+     */
+     private void error(Monitor monitor, String message, Object model, Object... messageParameters) {
+    	 if (monitor != null) {
+	        Problem problem = monitor.createProblem(this.getClass().getName(), "contribution-java-validation-messages", Severity.ERROR, model, message, (Object[])messageParameters);
+	        monitor.problem(problem);
+    	 }
+     }
+     
+    public QName getArtifactType() {
+        return IMPORT_JAVA;
+    }
+    
+    public Class<JavaImport> getModelType() {
+        return JavaImport.class;
+    }
+
+    /**
+     * Process <import.java package="" location=""/>
+     */
+    public JavaImport read(XMLStreamReader reader, ProcessorContext context) throws ContributionReadException {
+        JavaImport javaImport = this.factory.createJavaImport();
+        QName element = null;
+        
+        try {
+            while (reader.hasNext()) {
+                int event = reader.getEventType();
+                switch (event) {
+                    case START_ELEMENT:
+                        element = reader.getName();
+    
+                        // Read <import.java>
+                        if (IMPORT_JAVA.equals(element)) {
+                            String packageName = reader.getAttributeValue(null, PACKAGE);
+                            if (packageName == null) {
+                            	error(context.getMonitor(), "AttributePackageMissing", reader);
+                                //throw new ContributionReadException("Attribute 'package' is missing");
+                            } else
+                            	javaImport.setPackage(packageName);
+                            
+                            String location = getURIString(reader, LOCATION);                        
+                            javaImport.setLocation(location);
+                        }
+                        break;
+                    case XMLStreamConstants.END_ELEMENT:
+                        if (IMPORT_JAVA.equals(reader.getName())) {
+                            return javaImport;
+                        }
+                        break;        
+                }
+                
+                // Read the next element
+                if (reader.hasNext()) {
+                    reader.next();
+                }
+            }
+        }
+        catch (XMLStreamException e) {
+            ContributionReadException ex = new ContributionReadException(e);
+            error(context.getMonitor(), "XMLStreamException", reader, ex);
+        }
+        
+        return javaImport;
+    }
+
+    public void write(JavaImport javaImport, XMLStreamWriter writer, ProcessorContext context) throws ContributionWriteException, XMLStreamException {
+        
+        // Write <import.java>
+        writer.writeStartElement(IMPORT_JAVA.getNamespaceURI(), IMPORT_JAVA.getLocalPart());
+        
+        if (javaImport.getPackage() != null) {
+            writer.writeAttribute(PACKAGE, javaImport.getPackage());
+        }
+        if (javaImport.getLocation() != null) {
+            writer.writeAttribute(LOCATION, javaImport.getLocation());
+        }
+        
+        writer.writeEndElement();
+    }
+
+
+    public void resolve(JavaImport model, ModelResolver resolver, ProcessorContext context) throws ContributionResolveException {
+        
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/DefaultNamespaceImportExportFactory.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/DefaultNamespaceImportExportFactory.java
new file mode 100644
index 0000000000..a71fa61a54
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/DefaultNamespaceImportExportFactory.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.contribution.namespace;
+
+import org.apache.tuscany.sca.contribution.namespace.impl.NamespaceImportExportFactoryImpl;
+
+/**
+ * Default Namespace Import/Export model factory implementation
+ * 
+ * @version $Rev$ $Date$
+ */
+public class DefaultNamespaceImportExportFactory extends NamespaceImportExportFactoryImpl implements NamespaceImportExportFactory {
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/NamespaceExport.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/NamespaceExport.java
new file mode 100644
index 0000000000..c68aee8521
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/NamespaceExport.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.contribution.namespace;
+
+import org.apache.tuscany.sca.contribution.Export;
+
+
+/**
+ * The representation of an XML namespace export.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface NamespaceExport extends Export {
+
+    /**
+     * Get Namespace that identifies the export
+     * 
+     * @return The exported namespace
+     */
+    String getNamespace();
+
+    /**
+     * Set Namespace that identifies the export
+     * 
+     * @param namespace The exported namespace
+     */
+    void setNamespace(String namespace);
+    
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/NamespaceImport.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/NamespaceImport.java
new file mode 100644
index 0000000000..c452b15ee9
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/NamespaceImport.java
@@ -0,0 +1,60 @@
+/*
+ * 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.contribution.namespace;
+
+import org.apache.tuscany.sca.contribution.Import;
+
+/**
+ * The representation of an XML namespace import.
+ * 
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.asclient
+ */
+public interface NamespaceImport extends Import {
+
+    /**
+     * Get the location used to resolve the definitions for this import
+     * 
+     * @return The import location
+     */
+    String getLocation();
+
+    /**
+     * Set the location used to resolve the definitions for this import
+     * 
+     * @param location The import location
+     */
+    void setLocation(String location);
+
+    /**
+     * Get Namespace that identifies the import
+     * 
+     * @return The namespace
+     */
+    String getNamespace();
+
+    /**
+     * Set Namespace that identifies the import
+     * 
+     * @param namespace The namespace
+     */
+    void setNamespace(String namespace);
+    
+}
\ No newline at end of file
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/NamespaceImportExportFactory.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/NamespaceImportExportFactory.java
new file mode 100644
index 0000000000..cfbac8bb1f
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/NamespaceImportExportFactory.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.contribution.namespace;
+
+/**
+ * Base Namespace import/export model factory
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface NamespaceImportExportFactory {
+
+    /**
+     * Create a namespace import model object
+     * 
+     * @return The new NamespaceImport model object
+     */
+    NamespaceImport createNamespaceImport();
+    
+    /**
+     * Create a namespace export model object
+     * 
+     * @return The new NamespaceExport model object
+     */
+    NamespaceExport createNamespaceExport();
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/impl/NamespaceExportImpl.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/impl/NamespaceExportImpl.java
new file mode 100644
index 0000000000..99af328964
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/impl/NamespaceExportImpl.java
@@ -0,0 +1,55 @@
+/*
+ * 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.contribution.namespace.impl;
+
+import org.apache.tuscany.sca.assembly.impl.ExtensibleImpl;
+import org.apache.tuscany.sca.contribution.namespace.NamespaceExport;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+
+/**
+ * The representation of an export for the contribution
+ *
+ * @version $Rev$ $Date$
+ */
+public class NamespaceExportImpl extends ExtensibleImpl implements NamespaceExport {
+    private String namespace;
+    private ModelResolver modelResolver;
+
+    protected NamespaceExportImpl() {
+        super();
+    }
+
+    public String getNamespace() {
+        return namespace;
+    }
+
+    public void setNamespace(String namespace) {
+        this.namespace = namespace;
+    }
+
+    public ModelResolver getModelResolver() {
+        return modelResolver;
+    }
+
+    public void setModelResolver(ModelResolver modelResolver) {
+        this.modelResolver = modelResolver;
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/impl/NamespaceExportModelResolver.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/impl/NamespaceExportModelResolver.java
new file mode 100644
index 0000000000..7bf3c32c93
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/impl/NamespaceExportModelResolver.java
@@ -0,0 +1,55 @@
+/*
+ * 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.contribution.namespace.impl;
+
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+
+/**
+ * A model resolver for namespace exports.
+ *
+ * @version $Rev$ $Date$
+ */
+public class NamespaceExportModelResolver implements ModelResolver {
+
+    private ModelResolver resolver;
+    
+    public NamespaceExportModelResolver(ModelResolver resolver) {
+        this.resolver = resolver;
+    }
+    
+    public void addModel(Object resolved, ProcessorContext context) {
+        throw new IllegalStateException();
+    }
+
+    public Object removeModel(Object resolved, ProcessorContext context) {
+        throw new IllegalStateException();
+    }
+
+    public <T> T resolveModel(Class<T> modelClass, T unresolved, ProcessorContext context) {
+        
+        // Just delegate to the contribution's model resolver, namespace
+        // based filtering is implemented in the model specific model
+        // resolver, which know how to get the namespace of the particular
+        // type of model that they handle 
+        return resolver.resolveModel(modelClass, unresolved, context);
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/impl/NamespaceExportProcessor.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/impl/NamespaceExportProcessor.java
new file mode 100644
index 0000000000..0d410fb377
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/impl/NamespaceExportProcessor.java
@@ -0,0 +1,172 @@
+/*
+ * 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.contribution.namespace.impl;
+
+import static javax.xml.stream.XMLStreamConstants.START_ELEMENT;
+
+import javax.xml.namespace.QName;
+import javax.xml.stream.XMLStreamConstants;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+import javax.xml.stream.XMLStreamWriter;
+
+import org.apache.tuscany.sca.assembly.AssemblyFactory;
+import org.apache.tuscany.sca.contribution.namespace.NamespaceExport;
+import org.apache.tuscany.sca.contribution.namespace.NamespaceImportExportFactory;
+import org.apache.tuscany.sca.contribution.processor.BaseStAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.ContributionReadException;
+import org.apache.tuscany.sca.contribution.processor.ContributionResolveException;
+import org.apache.tuscany.sca.contribution.processor.ContributionWriteException;
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.StAXAttributeProcessor;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.monitor.Problem;
+import org.apache.tuscany.sca.monitor.Problem.Severity;
+
+/**
+ * Artifact processor for Namespace export
+ *
+ * @version $Rev$ $Date$
+ */
+public class NamespaceExportProcessor extends BaseStAXArtifactProcessor implements StAXArtifactProcessor<NamespaceExport> {
+
+    private static final String SCA11_NS = "http://docs.oasis-open.org/ns/opencsa/sca/200912";
+    private static final QName EXPORT = new QName(SCA11_NS, "export");
+    private static final String NAMESPACE = "namespace";
+
+    private final NamespaceImportExportFactory factory;
+    private final AssemblyFactory extensionFactory;
+    private final StAXArtifactProcessor<Object> extensionProcessor;
+    private final StAXAttributeProcessor<Object> attributeProcessor;
+    
+    public NamespaceExportProcessor(FactoryExtensionPoint modelFactories,
+                                    StAXArtifactProcessor<Object> extensionProcessor,
+                                    StAXAttributeProcessor<Object> attributeProcessor) {
+        this.factory = modelFactories.getFactory(NamespaceImportExportFactory.class);
+        this.extensionFactory = modelFactories.getFactory(AssemblyFactory.class);
+        this.extensionProcessor = extensionProcessor;
+        this.attributeProcessor = attributeProcessor;
+    }
+
+    /**
+     * Report a warning.
+     *
+     * @param problems
+     * @param message
+     * @param model
+     */
+     private void error(Monitor monitor, String message, Object model, Object... messageParameters) {
+    	 if (monitor != null) {
+	        Problem problem = monitor.createProblem(this.getClass().getName(), "contribution-namespace-validation-messages", Severity.ERROR, model, message, (Object[])messageParameters);
+	        monitor.problem(problem);
+    	 }
+     }
+
+    public QName getArtifactType() {
+        return EXPORT;
+    }
+
+    public Class<NamespaceExport> getModelType() {
+        return NamespaceExport.class;
+    }
+
+    /**
+     * Process <export namespace=""/>
+     */
+    public NamespaceExport read(XMLStreamReader reader, ProcessorContext context) throws ContributionReadException {
+        NamespaceExport namespaceExport = this.factory.createNamespaceExport();
+        QName element = null;
+
+        try {
+            while (reader.hasNext()) {
+                int event = reader.getEventType();
+                switch (event) {
+                    case START_ELEMENT:
+                        element = reader.getName();
+
+                        // Read <export>
+                        if (EXPORT.equals(element)) {
+                            String ns = reader.getAttributeValue(null, NAMESPACE);
+                            if (ns == null) {
+                            	error(context.getMonitor(), "AttributeNameSpaceMissing", reader);
+                                //throw new ContributionReadException("Attribute 'namespace' is missing");
+                            } else {
+                                namespaceExport.setNamespace(ns);
+                            }
+                            readExtendedAttributes(reader, namespaceExport, attributeProcessor, extensionFactory, context);
+                        } else {
+                            //read extended elements
+                            Object ext = extensionProcessor.read(reader, context);
+                            if (namespaceExport != null) {
+                                namespaceExport.getExtensions().add(ext);
+                            }
+                        }
+
+                        break;
+                    case XMLStreamConstants.END_ELEMENT:
+                        if (EXPORT.equals(reader.getName())) {
+                            return namespaceExport;
+                        }
+                        break;
+                }
+
+                // Read the next element
+                if (reader.hasNext()) {
+                    reader.next();
+                }
+            }
+        }
+        catch (XMLStreamException e) {
+            ContributionReadException ex = new ContributionReadException(e);
+            error(context.getMonitor(), "XMLStreamException", reader, ex);
+        }
+
+        return namespaceExport;
+    }
+
+    public void write(NamespaceExport namespaceExport, XMLStreamWriter writer, ProcessorContext context) throws ContributionWriteException, XMLStreamException {
+
+        // Write <export>
+        writer.writeStartElement(EXPORT.getNamespaceURI(), EXPORT.getLocalPart());
+
+        if (namespaceExport.getNamespace() != null) {
+            writer.writeAttribute(NAMESPACE, namespaceExport.getNamespace());
+        }
+
+        writeExtendedAttributes(writer, namespaceExport, attributeProcessor, context);
+
+        // handle extended elements
+        for (Object ext : namespaceExport.getExtensions()) {
+            extensionProcessor.write(ext, writer, context);
+        }
+
+        writer.writeEndElement();
+    }
+
+    public void resolve(NamespaceExport namespaceExport, ModelResolver resolver, ProcessorContext context) throws ContributionResolveException {
+
+        if (namespaceExport.getNamespace() != null)
+            // Initialize the export's resolver
+            namespaceExport.setModelResolver(new NamespaceExportModelResolver(resolver));
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/impl/NamespaceImportExportFactoryImpl.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/impl/NamespaceImportExportFactoryImpl.java
new file mode 100644
index 0000000000..1146e593a9
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/impl/NamespaceImportExportFactoryImpl.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.contribution.namespace.impl;
+
+import org.apache.tuscany.sca.contribution.namespace.NamespaceExport;
+import org.apache.tuscany.sca.contribution.namespace.NamespaceImport;
+import org.apache.tuscany.sca.contribution.namespace.NamespaceImportExportFactory;
+
+/**
+ * Namespace Import/Export model factory implementation
+ * 
+ * @version $Rev$ $Date$
+ */
+public class NamespaceImportExportFactoryImpl implements NamespaceImportExportFactory {
+
+    public NamespaceImport createNamespaceImport() {
+        return new NamespaceImportImpl();
+    }
+    
+    public NamespaceExport createNamespaceExport() {
+        return new NamespaceExportImpl();
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/impl/NamespaceImportImpl.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/impl/NamespaceImportImpl.java
new file mode 100644
index 0000000000..35e2d539d4
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/impl/NamespaceImportImpl.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.contribution.namespace.impl;
+
+import org.apache.tuscany.sca.assembly.impl.ExtensibleImpl;
+import org.apache.tuscany.sca.contribution.Export;
+import org.apache.tuscany.sca.contribution.namespace.NamespaceExport;
+import org.apache.tuscany.sca.contribution.namespace.NamespaceImport;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+
+/**
+ * The representation of an import for the contribution
+ *
+ * @version $Rev$ $Date$
+ */
+public class NamespaceImportImpl extends ExtensibleImpl implements NamespaceImport {
+    private ModelResolver modelResolver;
+
+    /**
+     * The namespace to be imported
+     */
+    private String namespace;
+    /**
+     * Optional location URI pointing to a Contribution that exports the namespace
+     */
+    private String location;
+
+
+    protected NamespaceImportImpl() {
+        super();
+    }
+
+    public String getLocation() {
+        return location;
+    }
+
+    public void setLocation(String location) {
+        this.location = location;
+    }
+
+    public String getNamespace() {
+        return namespace;
+    }
+
+    public void setNamespace(String namespace) {
+        this.namespace = namespace;
+    }
+
+    public ModelResolver getModelResolver() {
+        return modelResolver;
+    }
+
+    public void setModelResolver(ModelResolver modelResolver) {
+        this.modelResolver = modelResolver;
+    }
+
+
+    /**
+     * Match a NamespaceImport to a given NamespaceExport based on :
+     *    location is not provided
+     *    import and export namespaces match
+     */
+    public boolean match(Export export) {
+        if (export instanceof NamespaceExport) {
+            if (this.getNamespace().equals(((NamespaceExport)export).getNamespace())) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public String toString() {
+        return String.valueOf(namespace);
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/impl/NamespaceImportProcessor.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/impl/NamespaceImportProcessor.java
new file mode 100644
index 0000000000..17b0dc3953
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/namespace/impl/NamespaceImportProcessor.java
@@ -0,0 +1,178 @@
+/*
+ * 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.contribution.namespace.impl;
+
+import static javax.xml.stream.XMLStreamConstants.START_ELEMENT;
+
+import javax.xml.namespace.QName;
+import javax.xml.stream.XMLStreamConstants;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+import javax.xml.stream.XMLStreamWriter;
+
+import org.apache.tuscany.sca.assembly.AssemblyFactory;
+import org.apache.tuscany.sca.contribution.namespace.NamespaceImport;
+import org.apache.tuscany.sca.contribution.namespace.NamespaceImportExportFactory;
+import org.apache.tuscany.sca.contribution.processor.BaseStAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.ContributionReadException;
+import org.apache.tuscany.sca.contribution.processor.ContributionResolveException;
+import org.apache.tuscany.sca.contribution.processor.ContributionWriteException;
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.StAXAttributeProcessor;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.monitor.Problem;
+import org.apache.tuscany.sca.monitor.Problem.Severity;
+
+/**
+ * Artifact processor for Namespace import
+ *
+ * @version $Rev$ $Date$
+ */
+public class NamespaceImportProcessor extends BaseStAXArtifactProcessor implements StAXArtifactProcessor<NamespaceImport> {
+    private static final String SCA11_NS = "http://docs.oasis-open.org/ns/opencsa/sca/200912";
+
+    private static final QName IMPORT = new QName(SCA11_NS, "import");
+
+    private static final String NAMESPACE = "namespace";
+    private static final String LOCATION = "location";
+
+    private final NamespaceImportExportFactory factory;
+    private final AssemblyFactory extensionFactory;
+    private final StAXArtifactProcessor<Object> extensionProcessor;
+    private final StAXAttributeProcessor<Object> attributeProcessor;
+    
+    public NamespaceImportProcessor(FactoryExtensionPoint modelFactories,
+                                    StAXArtifactProcessor<Object> extensionProcessor,
+                                    StAXAttributeProcessor<Object> attributeProcessor) {
+        this.factory = modelFactories.getFactory(NamespaceImportExportFactory.class);
+        this.extensionFactory = modelFactories.getFactory(AssemblyFactory.class);
+        this.extensionProcessor = extensionProcessor;
+        this.attributeProcessor = attributeProcessor;
+    }
+
+    /**
+     * Report a warning.
+     *
+     * @param problems
+     * @param message
+     * @param model
+     */
+     private void error(Monitor monitor, String message, Object model, Object... messageParameters) {
+    	 if (monitor != null) {
+	        Problem problem = monitor.createProblem(this.getClass().getName(), "contribution-namespace-validation-messages", Severity.ERROR, model, message, (Object[])messageParameters);
+	        monitor.problem(problem);
+    	 }
+     }
+
+    public QName getArtifactType() {
+        return IMPORT;
+    }
+
+    public Class<NamespaceImport> getModelType() {
+        return NamespaceImport.class;
+    }
+
+    /**
+     * Process <import namespace="" location=""/>
+     */
+    public NamespaceImport read(XMLStreamReader reader, ProcessorContext context) throws ContributionReadException {
+        NamespaceImport namespaceImport = this.factory.createNamespaceImport();
+        QName element;
+
+        try {
+            while (reader.hasNext()) {
+                int event = reader.getEventType();
+                switch (event) {
+                    case START_ELEMENT:
+                        element = reader.getName();
+
+                        // Read <import>
+                        if (IMPORT.equals(element)) {
+                            String ns = reader.getAttributeValue(null, NAMESPACE);
+                            if (ns == null) {
+                            	error(context.getMonitor(), "AttributeNameSpaceMissing", reader);
+                                //throw new ContributionReadException("Attribute 'namespace' is missing");
+                            } else {
+                                namespaceImport.setNamespace(ns);
+                            }
+
+                            String location = getURIString(reader, LOCATION);
+                            if (location != null) {
+                                namespaceImport.setLocation(location);
+                            }
+                            readExtendedAttributes(reader, namespaceImport, attributeProcessor, extensionFactory, context);
+                        } else {
+                            // handle extended elements
+                            Object ext = extensionProcessor.read(reader, context);
+                            if (namespaceImport != null) {
+                                namespaceImport.getExtensions().add(ext);
+                            }
+                        }
+                        break;
+                    case XMLStreamConstants.END_ELEMENT:
+                        if (IMPORT.equals(reader.getName())) {
+                            return namespaceImport;
+                        }
+                        break;
+                }
+
+                // Read the next element
+                if (reader.hasNext()) {
+                    reader.next();
+                }
+            }
+        }
+        catch (XMLStreamException e) {
+            ContributionReadException ex = new ContributionReadException(e);
+            error(context.getMonitor(), "XMLStreamException", reader, ex);
+        }
+
+        return namespaceImport;
+    }
+
+    public void write(NamespaceImport namespaceImport, XMLStreamWriter writer, ProcessorContext context) throws ContributionWriteException, XMLStreamException {
+
+        // Write <import>
+        writer.writeStartElement(IMPORT.getNamespaceURI(), IMPORT.getLocalPart());
+
+        if (namespaceImport.getNamespace() != null) {
+            writer.writeAttribute(NAMESPACE, namespaceImport.getNamespace());
+        }
+        if (namespaceImport.getLocation() != null) {
+            writer.writeAttribute(LOCATION, namespaceImport.getLocation());
+        }
+
+        writeExtendedAttributes(writer, namespaceImport, attributeProcessor, context);
+        
+        //handle extended elements
+        for (Object ext : namespaceImport.getExtensions()) {
+            extensionProcessor.write(ext, writer, context);
+        }
+        
+        writer.writeEndElement();
+    }
+
+
+    public void resolve(NamespaceImport model, ModelResolver resolver, ProcessorContext context) throws ContributionResolveException {
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ArtifactProcessor.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ArtifactProcessor.java
new file mode 100644
index 0000000000..9ac3aebaf6
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ArtifactProcessor.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.contribution.processor;
+
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+
+/**
+ * Base interface for artifact processors.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface ArtifactProcessor<M> {
+    
+    /**
+     * Resolve references from this model to other models. For example references
+     * from a composite to another one, or references from a composite to a WSDL
+     * model.
+     * 
+     * @param model The model to resolve
+     * @param resolver The resolver to use to resolve referenced models
+     * @param context The context for the processor
+     */
+    void resolve(M model, ModelResolver resolver, ProcessorContext context) throws ContributionResolveException;
+    
+    /**
+     * Returns the type of model handled by this artifact processor.
+     * 
+     * @return The type of model handled by this artifact processor
+     */
+    Class<M> getModelType(); 
+    
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/BaseStAXArtifactProcessor.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/BaseStAXArtifactProcessor.java
new file mode 100644
index 0000000000..82902a11fe
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/BaseStAXArtifactProcessor.java
@@ -0,0 +1,532 @@
+/*
+ * 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.contribution.processor;
+
+import static javax.xml.stream.XMLStreamConstants.END_ELEMENT;
+import static javax.xml.stream.XMLStreamConstants.START_ELEMENT;
+
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+import javax.xml.namespace.NamespaceContext;
+import javax.xml.namespace.QName;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+import javax.xml.stream.XMLStreamWriter;
+
+import org.apache.tuscany.sca.assembly.AssemblyFactory;
+import org.apache.tuscany.sca.assembly.Extensible;
+import org.apache.tuscany.sca.assembly.Extension;
+import org.apache.tuscany.sca.common.xml.stax.StAXHelper;
+
+
+/**
+ * A base class with utility methods for the other artifact processors in this module.
+ *
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.inheritfrom
+ */
+public abstract class BaseStAXArtifactProcessor {
+    private static String SCA11_NS = "http://docs.oasis-open.org/ns/opencsa/sca/200912";
+    private static String SCA11_TUSCANY_NS = "http://tuscany.apache.org/xmlns/sca/1.1";
+
+    /**
+     * The StAXHelper without states
+     */
+    private static final StAXHelper helper = new StAXHelper(null, null, null);
+    /**
+     * Returns a QName from a string.
+     * @param reader
+     * @param value
+     * @return
+     */
+    protected QName getQNameValue(XMLStreamReader reader, String value) {
+        return StAXHelper.getValueAsQName(reader, value);
+    }
+
+    /**
+     * Returns the boolean value of an attribute.
+     * @param reader
+     * @param name
+     * @return
+     */
+    protected boolean getBoolean(XMLStreamReader reader, String name) {
+        Boolean attr = StAXHelper.getAttributeAsBoolean(reader, name);
+        if (attr == null) {
+            return false;
+        } else {
+            return attr.booleanValue();
+        }
+    }
+
+    /**
+     * Returns the QName value of an attribute.
+     * @param reader
+     * @param name
+     * @return
+     */
+    protected QName getQName(XMLStreamReader reader, String name) {
+        return StAXHelper.getAttributeAsQName(reader, name);
+    }
+
+    /**
+     * Returns the value of an attribute as a list of QNames.
+     * @param reader
+     * @param name
+     * @return
+     */
+    protected List<QName> getQNames(XMLStreamReader reader, String name) {
+        return StAXHelper.getAttributeAsQNames(reader, name);
+    }
+
+    /**
+     * Returns the string value of an attribute.
+     * @param reader
+     * @param name
+     * @return
+     */
+    protected String getString(XMLStreamReader reader, String name) {
+        return StAXHelper.getAttributeAsString(reader, name);
+    }
+    
+    /**
+     * Returns the string value of an attribute.
+     * @param reader
+     * @param name
+     * @return
+     */
+    protected String getURIString(XMLStreamReader reader, String name) {
+        return StAXHelper.getAttributeAsURIString(reader, name);
+    }    
+
+    /**
+     * Test if an attribute is explicitly set
+     * @param reader
+     * @param name
+     * @return
+     */
+    protected boolean isSet(XMLStreamReader reader, String name) {
+        return StAXHelper.isAttributePresent(reader, name);
+    }
+
+    /**
+     * Returns the value of xsi:type attribute
+     * @param reader The XML stream reader
+     * @return The QName of the type, if the attribute is not present, null is
+     *         returned.
+     */
+    protected QName getXSIType(XMLStreamReader reader) {
+        return StAXHelper.getXSIType(reader);
+    }
+
+    /**
+     * Parse the next child element.
+     * @param reader
+     * @return
+     * @throws XMLStreamException
+     */
+    protected boolean nextChildElement(XMLStreamReader reader) throws XMLStreamException {
+        while (reader.hasNext()) {
+            int event = reader.next();
+            if (event == END_ELEMENT) {
+                return false;
+            }
+            if (event == START_ELEMENT) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Advance the stream to the next END_ELEMENT event skipping any nested
+     * content.
+     * @param reader the reader to advance
+     * @throws XMLStreamException if there was a problem reading the stream
+     */
+    protected void skipToEndElement(XMLStreamReader reader) throws XMLStreamException {
+        StAXHelper.skipToEndElement(reader);
+    }
+
+    /**
+     *
+     * @param writer
+     * @param uri
+     * @throws XMLStreamException
+     */
+    private String setPrefix(XMLStreamWriter writer, String uri) throws XMLStreamException {
+        if (uri == null) {
+            return null;
+        }
+        String prefix = writer.getPrefix(uri);
+        if (prefix != null) {
+            return null;
+        } else {
+
+            // Find an available prefix and bind it to the given URI
+            NamespaceContext nsc = writer.getNamespaceContext();
+            for (int i=1; ; i++) {
+                prefix = "ns" + i;
+                if (nsc.getNamespaceURI(prefix) == null) {
+                    break;
+                }
+            }
+            writer.setPrefix(prefix, uri);
+            return prefix;
+        }
+
+    }
+
+    /**
+     * Start an element.
+     * @param uri
+     * @param name
+     * @param attrs
+     * @throws XMLStreamException
+     */
+    protected void writeStart(XMLStreamWriter writer, String uri, String name, XAttr... attrs)
+        throws XMLStreamException {
+        helper.writeStartElement(writer, "", name, uri);
+        writeAttributes(writer, attrs);
+    }
+
+    /**
+     * Start an element.
+     * @param qname
+     * @param attrs
+     * @throws XMLStreamException
+     */
+    protected void writeStart(XMLStreamWriter writer, QName qname, XAttr... attrs) throws XMLStreamException {
+        writeStart(writer, qname.getNamespaceURI(), qname.getLocalPart(), attrs);
+    }
+
+    /**
+     * End an element.
+     * @param writer
+     * @throws XMLStreamException
+     */
+    protected void writeEnd(XMLStreamWriter writer) throws XMLStreamException {
+        writer.writeEndElement();
+    }
+
+    /**
+     * Start a document.
+     * @param writer
+     * @throws XMLStreamException
+     */
+    protected void writeStartDocument(XMLStreamWriter writer, String uri, String name, XAttr... attrs) throws XMLStreamException {
+        writer.writeStartDocument();
+        writer.setDefaultNamespace(uri);
+        writeStart(writer, uri, name, attrs);
+        // writer.writeDefaultNamespace(uri);
+    }
+
+    /**
+     * Start a document.
+     * @param writer
+     * @param qname
+     * @param attrs
+     * @throws XMLStreamException
+     */
+    protected void writeStartDocument(XMLStreamWriter writer, QName qname, XAttr... attrs) throws XMLStreamException {
+        writeStartDocument(writer, qname.getNamespaceURI(), qname.getLocalPart(), attrs);
+    }
+
+    /**
+     * End a document.
+     * @param writer
+     * @throws XMLStreamException
+     */
+    protected void writeEndDocument(XMLStreamWriter writer) throws XMLStreamException {
+        writer.writeEndDocument();
+    }
+
+    /**
+     * Write attributes to the current element.
+     * @param writer
+     * @param attrs
+     * @throws XMLStreamException
+     */
+    protected void writeAttributes(XMLStreamWriter writer, XAttr... attrs) throws XMLStreamException {
+        for (XAttr attr : attrs) {
+            if (attr != null)
+                attr.write(writer);
+        }
+    }
+
+    /**
+     *
+     * @param reader
+     * @param extensible
+     * @param extensionAttributeProcessor
+     * @param extensionAttributeProcessor
+     * @param extensionFactory
+     * @param context TODO
+     * @param elementName
+     * @throws ContributionReadException
+     * @throws XMLStreamException
+     */
+    protected void readExtendedAttributes(XMLStreamReader reader,
+                                          Extensible extensible,
+                                          StAXAttributeProcessor extensionAttributeProcessor,
+                                          AssemblyFactory extensionFactory, ProcessorContext context) throws ContributionReadException,
+        XMLStreamException {
+        QName elementName = reader.getName();
+        for (int a = 0; a < reader.getAttributeCount(); a++) {
+            QName attributeName = reader.getAttributeName(a);
+            if (attributeName.getNamespaceURI() != null && attributeName.getNamespaceURI().length() > 0) {
+                if (!elementName.getNamespaceURI().equals(attributeName.getNamespaceURI())) {
+                    Object attributeValue = extensionAttributeProcessor.read(attributeName, reader, context);
+                    Extension attributeExtension;
+                    if (attributeValue instanceof Extension) {
+                        attributeExtension = (Extension)attributeValue;
+                    } else {
+                        attributeExtension = extensionFactory.createExtension();
+                        attributeExtension.setQName(attributeName);
+                        attributeExtension.setValue(attributeValue);
+                        attributeExtension.setAttribute(true);
+                    }
+                    extensible.getAttributeExtensions().add(attributeExtension);
+                }
+            }
+        }
+    }
+
+    /**
+     *
+     * @param writer
+     * @param extensibleElement
+     * @param extensionAttributeProcessor
+     * @param context TODO
+     * @param attributeModel
+     * @throws ContributionWriteException
+     * @throws XMLStreamException
+     */
+    protected void writeExtendedAttributes(XMLStreamWriter writer,
+                                           Extensible extensibleElement,
+                                           StAXAttributeProcessor extensionAttributeProcessor, ProcessorContext context)
+        throws ContributionWriteException, XMLStreamException {
+        
+        for (Extension extension : extensibleElement.getAttributeExtensions()) {
+            if (extension.isAttribute()) {
+                extensionAttributeProcessor.write(extension, writer, context);
+            }
+        }
+    }
+
+    protected void readExtendedElement(XMLStreamReader reader,
+                                       Extensible extensible,
+                                       StAXArtifactProcessor extensionProcessor, ProcessorContext context) 
+        throws ContributionReadException, XMLStreamException {
+        
+        Object ext = extensionProcessor.read(reader, context);
+        if (extensible != null) {
+            extensible.getExtensions().add(ext);
+        }
+    }
+
+    protected void writeExtendedElements(XMLStreamWriter writer,
+                                         Extensible extensible,
+                                         StAXArtifactProcessor extensionProcessor, ProcessorContext context) 
+        throws ContributionWriteException, XMLStreamException {
+        
+        List <Object> otherExtensions = new ArrayList<Object>();
+        
+        // write all generic extensions as elements 
+        // to produce semanticaly equal xml output 
+        for (Object ext : extensible.getExtensions()) {
+            if (ext instanceof Extension) {
+                extensionProcessor.write(ext, writer, context);
+            } else {
+                otherExtensions.add(ext);
+            }
+        }
+        
+        //wrap xml extensibility into a extension wrapper element
+        if(otherExtensions.size() > 0) {
+            
+            writeStart(writer, SCA11_NS, "extensions");
+            
+            for (Object extension : otherExtensions) {
+                extensionProcessor.write(extension, writer, context);
+            }
+            
+            writeEnd(writer);
+        }
+        
+    }
+
+    /**
+     * Represents an XML attribute that needs to be written to a document.
+     */
+    public static class XAttr {
+
+        private static final String SCA11_NS = "http://docs.oasis-open.org/ns/opencsa/sca/200912";
+
+        private String uri = SCA11_NS;
+        private String name;
+        private Object value;
+
+        public XAttr(String uri, String name, String value) {
+            this.uri = uri;
+            this.name = name;
+            this.value = value;
+        }
+
+        public XAttr(String name, String value) {
+            this(null, name, value);
+        }
+
+        public XAttr(String uri, String name, List<?> values) {
+            this.uri = uri;
+            this.name = name;
+            this.value = values;
+        }
+
+        public XAttr(String name, List<?> values) {
+            this(null, name, values);
+        }
+
+        public XAttr(String uri, String name, Boolean value) {
+            this.uri = uri;
+            this.name = name;
+            this.value = value;
+        }
+
+        public XAttr(String name, Boolean value) {
+            this(null, name, value);
+        }
+
+        public XAttr(String uri, String name, Integer value) {
+            this.uri = uri;
+            this.name = name;
+            this.value = value;
+        }
+
+        public XAttr(String name, Integer value) {
+            this(null, name, value);
+        }
+
+        public XAttr(String uri, String name, Double value) {
+            this.uri = uri;
+            this.name = name;
+            this.value = value;
+        }
+
+        public XAttr(String name, Double value) {
+            this(null, name, value);
+        }
+
+        public XAttr(String uri, String name, QName value) {
+            this.uri = uri;
+            this.name = name;
+            this.value = value;
+        }
+
+        public XAttr(String name, QName value) {
+            this(null, name, value);
+        }
+        
+        public String toString() {
+            return uri == null ? name + "=\"" + value + "\"" : "{" + uri + "}" + name + "=\"" + value + "\"";
+        }
+
+        /**
+         * Writes a string from a QName and registers a prefix for its namespace.
+         * @param reader
+         * @param value
+         * @return
+         */
+        private String writeQNameValue(XMLStreamWriter writer, QName qname) throws XMLStreamException {
+            if (qname != null) {
+                String prefix = helper.writeNamespace(writer, qname.getPrefix(), qname.getNamespaceURI());
+                if ("".equals(prefix)) {
+                    return qname.getLocalPart();
+                } else {
+                    return prefix + ":" + qname.getLocalPart();
+                }
+            }
+            return null;
+        }
+
+        /**
+         * Write to document
+         * @param writer
+         * @throws XMLStreamException
+         */
+        public void write(XMLStreamWriter writer) throws XMLStreamException {
+            String str;
+            if (value instanceof QName) {
+
+                // Write a QName
+                str = writeQNameValue(writer, (QName)value);
+
+            } else if (value instanceof Collection) {
+
+                // Write a list of values
+                Collection<?> values = (Collection<?>)value;
+                if (values.isEmpty()) {
+                    return;
+                }
+                StringBuffer buffer = new StringBuffer();
+                for (Object v: values) {
+                    if (v == null) {
+                        // Skip null values
+                        continue;
+                    }
+
+                    if (v instanceof XAttr) {
+                        // Write an XAttr value
+                        ((XAttr)v).write(writer);
+                        continue;
+                    }
+
+                    if (buffer.length() != 0) {
+                        buffer.append(' ');
+                    }
+                    if (v instanceof QName) {
+                        // Write a QName value
+                        buffer.append(writeQNameValue(writer, (QName)v));
+                    } else {
+                        // Write value as a string
+                        buffer.append(String.valueOf(v));
+                    }
+                }
+                str = buffer.toString();
+
+            } else {
+
+                // Write a string
+                if (value == null) {
+                    return;
+                }
+                str = String.valueOf(value);
+            }
+            if (str.length() == 0 && (value instanceof Collection)) {
+                return;
+            }
+
+            helper.writeAttribute(writer, "", name, uri, str);
+        }
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ContributionException.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ContributionException.java
new file mode 100644
index 0000000000..93cb8c7fc7
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ContributionException.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.contribution.processor;
+
+/**
+ * Base class for exceptions raised by contribution services.
+ *
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.asclient
+ */
+public class ContributionException extends Exception {
+
+    private static final long serialVersionUID = 4432880414927652578L;
+
+    protected ContributionException() {
+        super();
+    }
+
+    protected ContributionException(String message) {
+        super(message);
+    }
+
+    protected ContributionException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public ContributionException(Throwable cause) {
+        super(cause);
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ContributionReadException.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ContributionReadException.java
new file mode 100644
index 0000000000..ced2ad1899
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ContributionReadException.java
@@ -0,0 +1,96 @@
+/*
+ * 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.contribution.processor;
+
+
+/**
+ * Denotes an exception while reading artifacts inside an SCA contribution.
+ *
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.asclient
+ */
+public class ContributionReadException extends ContributionException {
+    public static final int UNDEFINED = -1;
+    private static final long serialVersionUID = -7459051598906813461L;
+    private String resourceURI;
+    private int line = UNDEFINED;
+    private int column = UNDEFINED;
+
+    public ContributionReadException(String message) {
+        super(message);
+    }
+
+    public ContributionReadException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public ContributionReadException(Throwable cause) {
+        super(cause);
+    }
+    
+    /**
+     * Returns the location of the resource that was being read.
+     *
+     * @return the location of the resource that was being read
+     */
+    public String getResourceURI() {
+        return resourceURI;
+    }
+
+    /**
+     * Sets the location of the resource that was being read.
+     *
+     * @param resourceURI the location of the resource that was being read
+     */
+    public void setResourceURI(String resourceURI) {
+        this.resourceURI = resourceURI;
+    }
+
+    /**
+     * Returns the line inside the resource that was being read.
+     * @return the line inside the resource that was being read
+     */
+    public int getLine() {
+        return line;
+    }
+
+    /**
+     * Sets the line inside the resource that was being read.
+     * @param line the line inside the resource that was being read
+     */
+    public void setLine(int line) {
+        this.line = line;
+    }
+
+    /**
+     * Returns the column inside the resource that was being read.
+     * @return the column inside the resource that was being read
+     */
+    public int getColumn() {
+        return column;
+    }
+
+    /**
+     * Sets the column inside the resource that was being read.
+     * @param column the column inside the resource that was being read
+     */
+    public void setColumn(int column) {
+        this.column = column;
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ContributionResolveException.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ContributionResolveException.java
new file mode 100644
index 0000000000..af42c25734
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ContributionResolveException.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.contribution.processor;
+
+
+/**
+ * Denotes a problem while resolving models inside an SCA contribution.
+ *
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.asclient
+ */
+public class ContributionResolveException extends ContributionException {
+    private static final long serialVersionUID = -7459051598906813461L;
+
+    public ContributionResolveException(String message) {
+        super(message);
+    }
+
+    public ContributionResolveException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public ContributionResolveException(Throwable cause) {
+        super(cause);
+    }
+    
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ContributionRuntimeException.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ContributionRuntimeException.java
new file mode 100644
index 0000000000..9db6292e3d
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ContributionRuntimeException.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.contribution.processor;
+
+/**
+ * Base class for runtime exceptions raised by contribution services.
+ *
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.asclient
+ */
+public class ContributionRuntimeException extends RuntimeException {
+    private static final long serialVersionUID = 7711215366287498896L;
+
+    protected ContributionRuntimeException() {
+        super();
+    }
+
+    protected ContributionRuntimeException(String message) {
+        super(message);
+    }
+
+    protected ContributionRuntimeException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public ContributionRuntimeException(Throwable cause) {
+        super(cause);
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ContributionWriteException.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ContributionWriteException.java
new file mode 100644
index 0000000000..4e1cd287bb
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ContributionWriteException.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.contribution.processor;
+
+
+
+/**
+ * Denotes an exception while writing artifacts inside an SCA contribution.
+ *
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.asclient
+ */
+public class ContributionWriteException extends ContributionException {
+    private static final long serialVersionUID = -7459051598906813461L;
+    private String resourceURI;
+
+    public ContributionWriteException(String message) {
+        super(message);
+    }
+
+    public ContributionWriteException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public ContributionWriteException(Throwable cause) {
+        super(cause);
+    }
+    
+    /**
+     * Returns the location of the resource that was being written.
+     *
+     * @return the location of the resource that was being written
+     */
+    public String getResourceURI() {
+        return resourceURI;
+    }
+
+    /**
+     * Sets the location of the resource that was being written.
+     *
+     * @param resourceURI the location of the resource that was being written
+     */
+    public void setResourceURI(String resourceURI) {
+        this.resourceURI = resourceURI;
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultArtifactProcessorExtensionPoint.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultArtifactProcessorExtensionPoint.java
new file mode 100644
index 0000000000..c871e4c868
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultArtifactProcessorExtensionPoint.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.contribution.processor;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * The default implementation of an artifact processor extension point.
+ *
+ * @version $Rev$ $Date$
+ */
+abstract class DefaultArtifactProcessorExtensionPoint<P extends ArtifactProcessor<?>> {
+    protected final Map<Object, P> processorsByArtifactType = new HashMap<Object, P>();
+    protected final Map<Class<?>, P> processorsByModelType = new HashMap<Class<?>, P>();
+
+    /**
+     * Constructs a new loader registry.
+     */
+    DefaultArtifactProcessorExtensionPoint() {
+    }
+
+    /**
+     * Returns the processor associated with the given artifact type.
+     *
+     * @param artifactType An artifact type
+     * @return The processor associated with the given artifact type
+     */
+    public P getProcessor(Object artifactType) {
+        return processorsByArtifactType.get(artifactType);
+    }
+
+    /**
+     * Returns the processor associated with the given model type.
+     *
+     * @param modelType A model type
+     * @return The processor associated with the given model type
+     */
+    public <T> P getProcessor(Class<T> modelType) {
+        Class<?>[] classes = modelType.getInterfaces();
+        for (Class<?> c : classes) {
+            P processor = processorsByModelType.get(c);
+            if (processor != null) {
+                return processor;
+            }
+        }
+        return processorsByModelType.get(modelType);
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultStAXArtifactProcessorExtensionPoint.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultStAXArtifactProcessorExtensionPoint.java
new file mode 100644
index 0000000000..151edeae0b
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultStAXArtifactProcessorExtensionPoint.java
@@ -0,0 +1,325 @@
+/*
+ * 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.contribution.processor;
+
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.util.Collection;
+import java.util.Map;
+
+import javax.xml.namespace.QName;
+import javax.xml.stream.XMLInputFactory;
+import javax.xml.stream.XMLOutputFactory;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+import javax.xml.stream.XMLStreamWriter;
+
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
+import org.apache.tuscany.sca.extensibility.ServiceDeclarationParser;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.monitor.Problem;
+import org.apache.tuscany.sca.monitor.Problem.Severity;
+
+/**
+ * The default implementation of an extension point for StAX artifact processors.
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefaultStAXArtifactProcessorExtensionPoint extends
+    DefaultArtifactProcessorExtensionPoint<StAXArtifactProcessor<?>> implements StAXArtifactProcessorExtensionPoint {
+
+    private ExtensionPointRegistry registry;
+    private FactoryExtensionPoint modelFactories;
+    private boolean loaded;
+    private StAXArtifactProcessor<Object> extensibleStAXProcessor;
+    private StAXAttributeProcessor<Object> extensibleStAXAttributeProcessor;
+
+    /**
+     * Constructs a new extension point.
+     */
+    public DefaultStAXArtifactProcessorExtensionPoint(ExtensionPointRegistry extensionPoints) {
+        this.registry = extensionPoints;
+        this.modelFactories = extensionPoints.getExtensionPoint(FactoryExtensionPoint.class);
+        XMLInputFactory inputFactory = modelFactories.getFactory(XMLInputFactory.class);
+        XMLOutputFactory outputFactory = modelFactories.getFactory(XMLOutputFactory.class);
+        this.extensibleStAXProcessor = new ExtensibleStAXArtifactProcessor(this, inputFactory, outputFactory);
+
+        StAXAttributeProcessorExtensionPoint attributeExtensionPoint =
+            extensionPoints.getExtensionPoint(StAXAttributeProcessorExtensionPoint.class);
+        this.extensibleStAXAttributeProcessor =
+            new ExtensibleStAXAttributeProcessor(attributeExtensionPoint, inputFactory, outputFactory);
+    }
+
+    public void addArtifactProcessor(StAXArtifactProcessor<?> artifactProcessor) {
+        if (artifactProcessor.getArtifactType() != null) {
+            processorsByArtifactType.put((Object)artifactProcessor.getArtifactType(), artifactProcessor);
+        }
+        if (artifactProcessor.getModelType() != null) {
+            processorsByModelType.put(artifactProcessor.getModelType(), artifactProcessor);
+        }
+    }
+
+    public void removeArtifactProcessor(StAXArtifactProcessor<?> artifactProcessor) {
+        if (artifactProcessor.getArtifactType() != null) {
+            processorsByArtifactType.remove((Object)artifactProcessor.getArtifactType());
+        }
+        if (artifactProcessor.getModelType() != null) {
+            processorsByModelType.remove(artifactProcessor.getModelType());
+        }
+    }
+
+    @Override
+    public <T> StAXArtifactProcessor<T> getProcessor(Class<T> modelType) {
+        loadArtifactProcessors();
+        return (StAXArtifactProcessor<T>)super.getProcessor(modelType);
+    }
+
+    @Override
+    public StAXArtifactProcessor<?> getProcessor(Object artifactType) {
+        loadArtifactProcessors();
+        return super.getProcessor(artifactType);
+    }
+
+    /**
+     * Lazily load artifact processors registered in the extension point.
+     */
+    private synchronized void loadArtifactProcessors() {
+        if (loaded)
+            return;
+
+        // Get the processor service declarations
+        Collection<ServiceDeclaration> processorDeclarations;
+        try {
+            processorDeclarations =
+                registry.getServiceDiscovery().getServiceDeclarations(StAXArtifactProcessor.class.getName());
+        } catch (IOException e) {
+            IllegalStateException ie = new IllegalStateException(e);
+            throw ie;
+        }
+
+        for (ServiceDeclaration processorDeclaration : processorDeclarations) {
+            Map<String, String> attributes = processorDeclaration.getAttributes();
+
+            // Load a StAX artifact processor
+
+            // Get the model QName
+            QName artifactType = ServiceDeclarationParser.getQName(attributes.get("qname"));
+
+            // Get the model class name
+            String modelTypeName = attributes.get("model");
+
+            // Get the model factory class name
+            String factoryName = attributes.get("factory");
+
+            // Create a processor wrapper and register it
+            StAXArtifactProcessor<?> processor =
+                new LazyStAXArtifactProcessor(artifactType, modelTypeName, factoryName, processorDeclaration,
+                                              registry, modelFactories, extensibleStAXProcessor,
+                                              extensibleStAXAttributeProcessor);
+            addArtifactProcessor(processor);
+        }
+
+        loaded = true;
+    }
+
+    /**
+     * A wrapper around an Artifact processor class allowing lazy loading and
+     * initialization of artifact processors.
+     */
+    private static class LazyStAXArtifactProcessor implements StAXArtifactProcessor {
+
+        private ExtensionPointRegistry extensionPoints;
+        private QName artifactType;
+        private String modelTypeName;
+        private String factoryName;
+        private ServiceDeclaration processorDeclaration;
+        private StAXArtifactProcessor<?> processor;
+        private Class<?> modelType;
+        private StAXArtifactProcessor<Object> extensionProcessor;
+        private StAXAttributeProcessor<Object> extensionAttributeProcessor;
+
+        LazyStAXArtifactProcessor(QName artifactType,
+                                  String modelTypeName,
+                                  String factoryName,
+                                  ServiceDeclaration processorDeclaration,
+                                  ExtensionPointRegistry extensionPoints,
+                                  FactoryExtensionPoint modelFactories,
+                                  StAXArtifactProcessor<Object> extensionProcessor,
+                                  StAXAttributeProcessor<Object> extensionAttributeProcessor) {
+
+            this.extensionPoints = extensionPoints;
+            this.artifactType = artifactType;
+            this.modelTypeName = modelTypeName;
+            this.factoryName = factoryName;
+            this.processorDeclaration = processorDeclaration;
+            this.extensionProcessor = extensionProcessor;
+            this.extensionAttributeProcessor = extensionAttributeProcessor;
+        }
+
+        public QName getArtifactType() {
+            return artifactType;
+        }
+
+        private void error(Monitor monitor, String message, Object model, Exception ex) {
+            if (monitor != null) {
+                Problem problem =
+                    monitor.createProblem(this.getClass().getName(),
+                                          "contribution-validation-messages",
+                                          Severity.ERROR,
+                                          model,
+                                          message,
+                                          ex);
+                monitor.problem(problem);
+            }
+        }
+
+        @SuppressWarnings("unchecked")
+        private StAXArtifactProcessor getProcessor() {
+            if (processor == null) {
+
+                if (processorDeclaration.getClassName()
+                    .equals("org.apache.tuscany.sca.assembly.xml.DefaultBeanModelProcessor")) {
+
+                    // Specific initialization for the DefaultBeanModelProcessor
+                    FactoryExtensionPoint modelFactories =
+                        extensionPoints.getExtensionPoint(FactoryExtensionPoint.class);
+                    try {
+                        Class<StAXArtifactProcessor> processorClass =
+                            (Class<StAXArtifactProcessor>)processorDeclaration.loadClass();
+                        Object modelFactory;
+                        if (factoryName != null) {
+                            Class<?> factoryClass = (Class<?>)processorDeclaration.loadClass(factoryName);
+                            modelFactory = modelFactories.getFactory(factoryClass);
+                        } else {
+                            modelFactory = null;
+                        }
+                        Constructor<StAXArtifactProcessor> constructor =
+                            processorClass.getConstructor(FactoryExtensionPoint.class,
+                                                          QName.class,
+                                                          Class.class,
+                                                          Object.class);
+                        processor = constructor.newInstance(modelFactories, artifactType, getModelType(), modelFactory);
+                    } catch (Exception e) {
+                        IllegalStateException ie = new IllegalStateException(e);
+                        throw ie;
+                    }
+                } else {
+                    FactoryExtensionPoint modelFactories =
+                        extensionPoints.getExtensionPoint(FactoryExtensionPoint.class);
+
+                    // Load and instantiate the processor class
+                    try {
+                        Class<StAXArtifactProcessor> processorClass =
+                            (Class<StAXArtifactProcessor>)processorDeclaration.loadClass();
+                        try {
+                            Constructor<StAXArtifactProcessor> constructor =
+                                processorClass.getConstructor(FactoryExtensionPoint.class);
+                            processor = constructor.newInstance(modelFactories);
+                        } catch (NoSuchMethodException e) {
+                            try {
+                                Constructor<StAXArtifactProcessor> constructor =
+                                    processorClass.getConstructor(ExtensionPointRegistry.class);
+                                processor = constructor.newInstance(extensionPoints);
+                            } catch (NoSuchMethodException e1) {
+                                try {
+                                    Constructor<StAXArtifactProcessor> constructor =
+                                        processorClass.getConstructor(FactoryExtensionPoint.class,
+                                                                      StAXArtifactProcessor.class);
+                                    processor = constructor.newInstance(modelFactories, extensionProcessor);
+                                } catch (NoSuchMethodException e2) {
+                                    try {
+                                        Constructor<StAXArtifactProcessor> constructor =
+                                            processorClass.getConstructor(FactoryExtensionPoint.class,
+                                                                          StAXArtifactProcessor.class,
+                                                                          StAXAttributeProcessor.class);
+                                        processor =
+                                            constructor.newInstance(modelFactories,
+                                                                    extensionProcessor,
+                                                                    extensionAttributeProcessor);
+                                    } catch (NoSuchMethodException e2a) {
+                                        try {
+                                            Constructor<StAXArtifactProcessor> constructor =
+                                                processorClass.getConstructor(ExtensionPointRegistry.class,
+                                                                              StAXArtifactProcessor.class);
+                                            processor = constructor.newInstance(extensionPoints, extensionProcessor);
+                                        } catch (NoSuchMethodException e3) {
+                                            try {
+                                                Constructor<StAXArtifactProcessor> constructor =
+                                                    processorClass.getConstructor(ExtensionPointRegistry.class,
+                                                                                  StAXArtifactProcessor.class,
+                                                                                  StAXAttributeProcessor.class);
+                                                processor =
+                                                    constructor.newInstance(extensionPoints,
+                                                                            extensionProcessor,
+                                                                            extensionAttributeProcessor);
+                                            } catch (NoSuchMethodException e3a) {
+
+                                                Constructor<StAXArtifactProcessor> constructor =
+                                                    processorClass.getConstructor();
+                                                processor = constructor.newInstance();
+
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    } catch (Exception e) {
+                        IllegalStateException ie = new IllegalStateException(e);
+                        throw ie;
+                    }
+                }
+            }
+            return processor;
+        }
+
+        public Object read(XMLStreamReader inputSource, ProcessorContext context) throws ContributionReadException,
+            XMLStreamException {
+            return getProcessor().read(inputSource, context);
+        }
+
+        @SuppressWarnings("unchecked")
+        public void write(Object model, XMLStreamWriter outputSource, ProcessorContext context)
+            throws ContributionWriteException, XMLStreamException {
+            getProcessor().write(model, outputSource, context);
+        }
+
+        public Class<?> getModelType() {
+            if (modelTypeName != null && modelType == null) {
+                try {
+                    modelType = processorDeclaration.loadClass(modelTypeName);
+                } catch (Exception e) {
+                    IllegalStateException ie = new IllegalStateException(e);
+                    throw ie;
+                }
+            }
+            return modelType;
+        }
+
+        @SuppressWarnings("unchecked")
+        public void resolve(Object model, ModelResolver resolver, ProcessorContext context)
+            throws ContributionResolveException {
+            getProcessor().resolve(model, resolver, context);
+        }
+
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultStAXAttributeProcessorExtensionPoint.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultStAXAttributeProcessorExtensionPoint.java
new file mode 100644
index 0000000000..e76d6cb299
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultStAXAttributeProcessorExtensionPoint.java
@@ -0,0 +1,292 @@
+/*
+ * 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.contribution.processor;
+
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.util.Collection;
+import java.util.Map;
+
+import javax.xml.namespace.QName;
+import javax.xml.stream.XMLInputFactory;
+import javax.xml.stream.XMLOutputFactory;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+import javax.xml.stream.XMLStreamWriter;
+
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+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.monitor.Monitor;
+import org.apache.tuscany.sca.monitor.MonitorFactory;
+import org.apache.tuscany.sca.monitor.Problem;
+import org.apache.tuscany.sca.monitor.Problem.Severity;
+
+/**
+ * The default implementation of an extension point for StAX artifact processors.
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefaultStAXAttributeProcessorExtensionPoint extends
+    DefaultArtifactProcessorExtensionPoint<StAXAttributeProcessor<?>> implements StAXAttributeProcessorExtensionPoint {
+
+    private ExtensionPointRegistry registry;
+    private FactoryExtensionPoint modelFactories;
+    private StAXAttributeProcessor<Object> extensibleStAXAttributeProcessor;
+    private boolean loaded;
+    private Monitor monitor = null;
+
+    /**
+     * Constructs a new extension point.
+     */
+    public DefaultStAXAttributeProcessorExtensionPoint(ExtensionPointRegistry extensionPoints) {
+        this.registry = extensionPoints;
+        this.modelFactories = extensionPoints.getExtensionPoint(FactoryExtensionPoint.class);
+        XMLInputFactory inputFactory = modelFactories.getFactory(XMLInputFactory.class);
+        XMLOutputFactory outputFactory = modelFactories.getFactory(XMLOutputFactory.class);
+        UtilityExtensionPoint utilities = this.registry.getExtensionPoint(UtilityExtensionPoint.class);
+        MonitorFactory monitorFactory = utilities.getUtility(MonitorFactory.class);
+        if (monitorFactory != null) {
+            this.monitor = monitorFactory.createMonitor();
+        }
+        this.extensibleStAXAttributeProcessor = new ExtensibleStAXAttributeProcessor(this, inputFactory, outputFactory);
+    }
+
+    /**
+     * Report a exception.
+     *
+     * @param problems
+     * @param message
+     * @param model
+    */
+    private void error(String message, Object model, Exception ex) {
+        if (monitor != null) {
+            Problem problem =
+                monitor.createProblem(this.getClass().getName(),
+                                      "contribution-validation-messages",
+                                      Severity.ERROR,
+                                      model,
+                                      message,
+                                      ex);
+            monitor.problem(problem);
+        }
+    }
+
+    public void addArtifactProcessor(StAXAttributeProcessor<?> artifactProcessor) {
+        if (artifactProcessor.getArtifactType() != null) {
+            processorsByArtifactType.put((Object)artifactProcessor.getArtifactType(), artifactProcessor);
+        }
+        if (artifactProcessor.getModelType() != null) {
+            processorsByModelType.put(artifactProcessor.getModelType(), artifactProcessor);
+        }
+    }
+
+    public void removeArtifactProcessor(StAXAttributeProcessor<?> artifactProcessor) {
+        if (artifactProcessor.getArtifactType() != null) {
+            processorsByArtifactType.remove((Object)artifactProcessor.getArtifactType());
+        }
+        if (artifactProcessor.getModelType() != null) {
+            processorsByModelType.remove(artifactProcessor.getModelType());
+        }
+    }
+
+    @Override
+    public <T> StAXAttributeProcessor<T> getProcessor(Class<T> modelType) {
+        loadArtifactProcessors();
+        return (StAXAttributeProcessor<T>)super.getProcessor(modelType);
+    }
+
+    @Override
+    public StAXAttributeProcessor<?> getProcessor(Object artifactType) {
+        loadArtifactProcessors();
+        return super.getProcessor(artifactType);
+    }
+
+    /**
+     * Lazily load artifact processors registered in the extension point.
+     */
+    private synchronized void loadArtifactProcessors() {
+        if (loaded)
+            return;
+
+        // Get the processor service declarations
+        Collection<ServiceDeclaration> processorDeclarations;
+        try {
+            processorDeclarations =
+                registry.getServiceDiscovery().getServiceDeclarations(StAXAttributeProcessor.class.getName());
+        } catch (IOException e) {
+            IllegalStateException ie = new IllegalStateException(e);
+            error("IllegalStateException", extensibleStAXAttributeProcessor, ie);
+            throw ie;
+        }
+
+        for (ServiceDeclaration processorDeclaration : processorDeclarations) {
+            Map<String, String> attributes = processorDeclaration.getAttributes();
+
+            // Load a StAX artifact processor
+
+            // Get the model QName
+            QName artifactType = ServiceDeclarationParser.getQName(attributes.get("qname"));
+
+            // Get the model class name
+            String modelTypeName = attributes.get("model");
+
+            // Get the model factory class name
+            String factoryName = attributes.get("factory");
+
+            // Create a processor wrapper and register it
+            StAXAttributeProcessor<?> processor =
+                new LazyStAXAttributeProcessor(artifactType, modelTypeName, factoryName, processorDeclaration,
+                                               registry, modelFactories, extensibleStAXAttributeProcessor);
+            addArtifactProcessor(processor);
+        }
+
+        loaded = true;
+    }
+
+    /**
+     * A wrapper around an Artifact processor class allowing lazy loading and
+     * initialization of artifact processors.
+     */
+    private static class LazyStAXAttributeProcessor implements StAXAttributeProcessor {
+
+        private ExtensionPointRegistry extensionPoints;
+        private QName artifactType;
+        private String modelTypeName;
+        private String factoryName;
+        private ServiceDeclaration processorDeclaration;
+        private StAXAttributeProcessor<?> processor;
+        private Class<?> modelType;
+        private StAXAttributeProcessor<Object> extensionProcessor;
+
+        LazyStAXAttributeProcessor(QName artifactType,
+                                   String modelTypeName,
+                                   String factoryName,
+                                   ServiceDeclaration processorDeclaration,
+                                   ExtensionPointRegistry extensionPoints,
+                                   FactoryExtensionPoint modelFactories,
+                                   StAXAttributeProcessor<Object> extensionProcessor) {
+
+            this.extensionPoints = extensionPoints;
+            this.artifactType = artifactType;
+            this.modelTypeName = modelTypeName;
+            this.factoryName = factoryName;
+            this.processorDeclaration = processorDeclaration;
+            this.extensionProcessor = extensionProcessor;
+        }
+
+        public QName getArtifactType() {
+            return artifactType;
+        }
+
+        @SuppressWarnings("unchecked")
+        private StAXAttributeProcessor getProcessor() {
+            if (processor == null) {
+                FactoryExtensionPoint modelFactories = extensionPoints.getExtensionPoint(FactoryExtensionPoint.class);
+
+                // Load and instantiate the processor class
+                try {
+                    Class<StAXAttributeProcessor> processorClass =
+                        (Class<StAXAttributeProcessor>)processorDeclaration.loadClass();
+                    try {
+                        Constructor<StAXAttributeProcessor> constructor =
+                            processorClass.getConstructor(FactoryExtensionPoint.class);
+                        processor = constructor.newInstance(modelFactories);
+                    } catch (NoSuchMethodException e) {
+                        try {
+                            Constructor<StAXAttributeProcessor> constructor =
+                                processorClass.getConstructor(ExtensionPointRegistry.class);
+                            processor = constructor.newInstance(extensionPoints);
+                        } catch (NoSuchMethodException e1) {
+                            try {
+                                Constructor<StAXAttributeProcessor> constructor =
+                                    processorClass.getConstructor(FactoryExtensionPoint.class,
+                                                                  StAXArtifactProcessor.class);
+                                processor = constructor.newInstance(modelFactories, extensionProcessor);
+                            } catch (NoSuchMethodException e2) {
+                                try {
+                                    Constructor<StAXAttributeProcessor> constructor =
+                                        processorClass.getConstructor(ExtensionPointRegistry.class,
+                                                                      StAXArtifactProcessor.class);
+                                    processor = constructor.newInstance(extensionPoints, extensionProcessor);
+                                } catch (NoSuchMethodException e3) {
+                                    try {
+                                        Constructor<StAXAttributeProcessor> constructor =
+                                            processorClass.getConstructor(FactoryExtensionPoint.class);
+                                        processor = constructor.newInstance(modelFactories);
+                                    } catch (NoSuchMethodException e4) {
+                                        try {
+                                            Constructor<StAXAttributeProcessor> constructor =
+                                                processorClass.getConstructor(ExtensionPointRegistry.class);
+                                            processor = constructor.newInstance(extensionPoints);
+                                        } catch (NoSuchMethodException e4a) {
+
+                                            Constructor<StAXAttributeProcessor> constructor =
+                                                processorClass.getConstructor();
+                                            processor = constructor.newInstance();
+
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                } catch (Exception e) {
+                    IllegalStateException ie = new IllegalStateException(e);
+                    throw ie;
+                }
+
+            }
+            return processor;
+        }
+
+        public Object read(QName attributeName, XMLStreamReader inputSource, ProcessorContext context)
+            throws ContributionReadException, XMLStreamException {
+            return getProcessor().read(attributeName, inputSource, context);
+        }
+
+        @SuppressWarnings("unchecked")
+        public void write(Object model, XMLStreamWriter outputSource, ProcessorContext context)
+            throws ContributionWriteException, XMLStreamException {
+            getProcessor().write(model, outputSource, context);
+        }
+
+        public Class<?> getModelType() {
+            if (modelTypeName != null && modelType == null) {
+                try {
+                    modelType = processorDeclaration.loadClass(modelTypeName);
+                } catch (Exception e) {
+                    IllegalStateException ie = new IllegalStateException(e);
+                    throw ie;
+                }
+            }
+            return modelType;
+        }
+
+        @SuppressWarnings("unchecked")
+        public void resolve(Object model, ModelResolver resolver, ProcessorContext context)
+            throws ContributionResolveException {
+            getProcessor().resolve(model, resolver, context);
+        }
+
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultURLArtifactProcessorExtensionPoint.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultURLArtifactProcessorExtensionPoint.java
new file mode 100644
index 0000000000..e22d7762fa
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultURLArtifactProcessorExtensionPoint.java
@@ -0,0 +1,320 @@
+/*
+ * 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.contribution.processor;
+
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.net.URI;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.regex.Pattern;
+
+import javax.xml.stream.XMLInputFactory;
+import javax.xml.stream.XMLOutputFactory;
+
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
+
+/**
+ * The default implementation of a URL artifact processor extension point.
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefaultURLArtifactProcessorExtensionPoint extends
+    DefaultArtifactProcessorExtensionPoint<URLArtifactProcessor<?>> implements URLArtifactProcessorExtensionPoint {
+
+    private ExtensionPointRegistry registry;
+    private StAXArtifactProcessor<?> staxProcessor;
+    private boolean loaded;
+
+    /**
+     * Constructs a new extension point.
+     */
+    public DefaultURLArtifactProcessorExtensionPoint(ExtensionPointRegistry extensionPoints) {
+        this.registry = extensionPoints;
+        FactoryExtensionPoint modelFactories = this.registry.getExtensionPoint(FactoryExtensionPoint.class);
+        XMLInputFactory inputFactory = modelFactories.getFactory(XMLInputFactory.class);
+        XMLOutputFactory outputFactory = modelFactories.getFactory(XMLOutputFactory.class);
+        StAXArtifactProcessorExtensionPoint staxProcessors =
+            extensionPoints.getExtensionPoint(StAXArtifactProcessorExtensionPoint.class);
+        staxProcessor = new ExtensibleStAXArtifactProcessor(staxProcessors, inputFactory, outputFactory);
+    }
+
+    public void addArtifactProcessor(URLArtifactProcessor<?> artifactProcessor) {
+        if (artifactProcessor.getArtifactType() != null) {
+            Pattern pattern = Pattern.compile(wildcard2regex(artifactProcessor.getArtifactType()));
+            processorsByArtifactType.put(pattern, artifactProcessor);
+        }
+        if (artifactProcessor.getModelType() != null) {
+            processorsByModelType.put(artifactProcessor.getModelType(), artifactProcessor);
+        }
+    }
+
+    public void removeArtifactProcessor(URLArtifactProcessor<?> artifactProcessor) {
+        if (artifactProcessor.getArtifactType() != null) {
+            String regex = wildcard2regex(artifactProcessor.getArtifactType());
+            for (Object key : processorsByArtifactType.keySet()) {
+                if ((key instanceof Pattern) && ((Pattern)key).pattern().equals(regex)) {
+                    processorsByArtifactType.remove(key);
+                }
+            }
+            processorsByArtifactType.remove((Object)artifactProcessor.getArtifactType());
+        }
+        if (artifactProcessor.getModelType() != null) {
+            processorsByModelType.remove(artifactProcessor.getModelType());
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+	@Override
+    public <T> URLArtifactProcessor<T> getProcessor(Class<T> modelType) {
+        loadProcessors();
+        return (URLArtifactProcessor<T>)super.getProcessor(modelType);
+    }
+
+    public Collection<URLArtifactProcessor<?>> getProcessors(Object artifactType) {
+        loadProcessors();
+        String uri = (String)artifactType;
+        if (uri.endsWith("/")) {
+            // Ignore directories
+            return Collections.emptyList();
+        }
+        if (!uri.startsWith("/")) {
+            uri = "/" + uri;
+        }
+        List<URLArtifactProcessor<?>> processors = new ArrayList<URLArtifactProcessor<?>>();
+        for (Map.Entry<Object, URLArtifactProcessor<?>> e : processorsByArtifactType.entrySet()) {
+            Pattern pattern = (Pattern)e.getKey();
+            if (pattern.matcher(uri).matches()) {
+                processors.add(e.getValue());
+            }
+        }
+        return processors;
+    }
+
+    @SuppressWarnings("unchecked")
+	public URLArtifactProcessor<?> getProcessor(Object artifactType) {
+        Collection<URLArtifactProcessor<?>> processors = getProcessors(artifactType);
+        return processors.isEmpty() ? null : processors.iterator().next();
+    }
+
+    private static String wildcard2regex(String pattern) {
+        String wildcard = pattern;
+        if (wildcard.endsWith("/")) {
+            // Directory: xyz/ --> xyz/**
+            wildcard = wildcard + "**";
+        }
+        if (wildcard.startsWith(".")) {
+            // File extension: .xyz --> **/*.xyz
+            wildcard = "**/*" + wildcard;
+        } else if (wildcard.indexOf('/') == -1) {
+            // File name: abc.txt --> **/abc.txt
+            wildcard = "**/" + wildcard;
+        } else if (!(wildcard.startsWith("/") || wildcard.startsWith("**"))) {
+            wildcard = '/' + wildcard;
+        }
+        StringBuffer regex = new StringBuffer();
+        char[] chars = wildcard.toCharArray();
+        for (int i = 0; i < chars.length; i++) {
+            switch (chars[i]) {
+                case '*':
+                    if (i < chars.length - 1 && chars[i + 1] == '*') {
+                        // Next char is '*'
+                        if (i < chars.length - 2) {
+                            if (chars[i + 2] == '/') {
+                                // The wildcard is **/, it matches zero or more directories
+                                regex.append("(.*/)*");
+                                i += 2; // Skip */
+                            } else {
+                                // ** can only be followed by /
+                                throw new IllegalArgumentException("** can only be used as the name for a directory");
+                            }
+                        } else {
+                            regex.append(".*");
+                            i++; // Skip next *
+                        }
+                    } else {
+                        // Non-directory
+                        regex.append("[^/]*");
+                    }
+                    break;
+                case '?':
+                    regex.append("[^/]");
+                    break;
+                case '\\':
+                case '|':
+                case '(':
+                case ')':
+                    // case '[':
+                    // case ']':
+                    // case '{':
+                    // case '}':
+                case '^':
+                case '$':
+                case '+':
+                case '.':
+                case '<':
+                case '>':
+                    regex.append("\\").append(chars[i]);
+                    break;
+                default:
+                    regex.append(chars[i]);
+                    break;
+            }
+        }
+        return regex.toString();
+    }
+
+    /**
+     * Lazily load artifact processors registered in the extension point.
+     */
+    private synchronized void loadProcessors() {
+        if (loaded)
+            return;
+
+        // Get the processor service declarations
+        Collection<ServiceDeclaration> processorDeclarations;
+        try {
+            processorDeclarations =
+                registry.getServiceDiscovery().getServiceDeclarations(URLArtifactProcessor.class.getName());
+        } catch (IOException e) {
+            IllegalStateException ie = new IllegalStateException(e);
+            throw ie;
+        }
+
+        for (ServiceDeclaration processorDeclaration : processorDeclarations) {
+            Map<String, String> attributes = processorDeclaration.getAttributes();
+            // Load a URL artifact processor
+            String artifactType = attributes.get("type");
+            String modelTypeName = attributes.get("model");
+
+            // Create a processor wrapper and register it
+            URLArtifactProcessor<?> processor =
+                new LazyURLArtifactProcessor(artifactType, modelTypeName, processorDeclaration, registry,
+                                             staxProcessor);
+            addArtifactProcessor(processor);
+        }
+
+        loaded = true;
+    }
+
+    /**
+     * A wrapper around an Artifact processor class allowing lazy loading and
+     * initialization of artifact processors.
+     */
+    private static class LazyURLArtifactProcessor implements ExtendedURLArtifactProcessor {
+
+        private ExtensionPointRegistry extensionPoints;
+        private String artifactType;
+        private String modelTypeName;
+        private ServiceDeclaration processorDeclaration;
+        private URLArtifactProcessor<?> processor;
+        private Class<?> modelType;
+        private StAXArtifactProcessor<?> staxProcessor;
+
+        LazyURLArtifactProcessor(String artifactType,
+                                 String modelTypeName,
+                                 ServiceDeclaration processorDeclaration,
+                                 ExtensionPointRegistry extensionPoints,
+                                 StAXArtifactProcessor<?> staxProcessor) {
+            this.artifactType = artifactType;
+            this.modelTypeName = modelTypeName;
+            this.processorDeclaration = processorDeclaration;
+            this.extensionPoints = extensionPoints;
+            this.staxProcessor = staxProcessor;
+        }
+
+        public String getArtifactType() {
+            return artifactType;
+        }
+
+        @SuppressWarnings("unchecked")
+        private URLArtifactProcessor getProcessor() {
+            if (processor == null) {
+                try {
+                    FactoryExtensionPoint modelFactories =
+                        extensionPoints.getExtensionPoint(FactoryExtensionPoint.class);
+                    Class<URLArtifactProcessor> processorClass =
+                        (Class<URLArtifactProcessor>)processorDeclaration.loadClass();
+                    try {
+                        Constructor<URLArtifactProcessor> constructor =
+                            processorClass.getConstructor(FactoryExtensionPoint.class);
+                        processor = constructor.newInstance(modelFactories);
+                    } catch (NoSuchMethodException e) {
+                        try {
+                            Constructor<URLArtifactProcessor> constructor =
+                                processorClass.getConstructor(FactoryExtensionPoint.class,
+                                                              StAXArtifactProcessor.class);
+                            processor = constructor.newInstance(modelFactories, staxProcessor);
+                        } catch (NoSuchMethodException e2) {
+                            Constructor<URLArtifactProcessor> constructor =
+                                processorClass.getConstructor(ExtensionPointRegistry.class,
+                                                              StAXArtifactProcessor.class);
+                            processor = constructor.newInstance(extensionPoints, staxProcessor);
+                        }
+                    }
+                } catch (Throwable e) {
+                    IllegalStateException ie = new IllegalStateException("Exception during getProcessor() for " + 
+                    		                                             processorDeclaration.getClassName(), e);
+                    throw ie;
+                }
+            }
+            return processor;
+        }
+
+        public Object read(URL contributionURL, URI artifactURI, URL artifactURL, ProcessorContext context) throws ContributionReadException {
+            return getProcessor().read(contributionURL, artifactURI, artifactURL, context);
+        }
+
+        public Class<?> getModelType() {
+            if (modelTypeName != null && modelType == null) {
+                try {
+                    modelType = processorDeclaration.loadClass(modelTypeName);
+                } catch (ClassNotFoundException e) {
+                    IllegalStateException ie = new IllegalStateException(e);
+                    throw ie;
+                }
+            }
+            return modelType;
+        }
+
+        @SuppressWarnings("unchecked")
+        public void resolve(Object model, ModelResolver resolver, ProcessorContext context) throws ContributionResolveException {
+            getProcessor().resolve(model, resolver, context);
+        } // end method resolve
+        
+        /**
+         * Preresolve phase, for ExtendedURLArtifactProcessors only
+         */
+        @SuppressWarnings("unchecked")
+        public void preResolve( Object model, ModelResolver resolver, ProcessorContext context) throws ContributionResolveException {
+        	URLArtifactProcessor<?> processor = getProcessor();
+        	if( processor instanceof ExtendedURLArtifactProcessor ) {
+        		((ExtendedURLArtifactProcessor)processor).preResolve(model, resolver, context);
+        	} // end if
+        } // end method resolve
+
+    } // end class LazyURLArtifactProcessor
+} // end class DefaultURLArtifactProcessorExtensionPoint
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultValidatingXMLInputFactory.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultValidatingXMLInputFactory.java
new file mode 100644
index 0000000000..59fa5990d6
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultValidatingXMLInputFactory.java
@@ -0,0 +1,435 @@
+/*
+ * 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.contribution.processor;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.Reader;
+import java.io.StringReader;
+import java.net.URL;
+import java.security.AccessController;
+import java.security.PrivilegedActionException;
+import java.security.PrivilegedExceptionAction;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+
+import javax.xml.XMLConstants;
+import javax.xml.namespace.QName;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.parsers.SAXParserFactory;
+import javax.xml.stream.EventFilter;
+import javax.xml.stream.StreamFilter;
+import javax.xml.stream.XMLEventReader;
+import javax.xml.stream.XMLInputFactory;
+import javax.xml.stream.XMLReporter;
+import javax.xml.stream.XMLResolver;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+import javax.xml.stream.util.XMLEventAllocator;
+import javax.xml.transform.Source;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.sax.SAXSource;
+import javax.xml.validation.Schema;
+import javax.xml.validation.SchemaFactory;
+
+import org.apache.tuscany.sca.assembly.xsd.Constants;
+import org.apache.tuscany.sca.common.xml.XMLDocumentHelper;
+import org.apache.tuscany.sca.common.xml.stax.StAXHelper;
+import org.apache.tuscany.sca.core.DefaultExtensionPointRegistry;
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+import org.apache.tuscany.sca.core.UtilityExtensionPoint;
+import org.apache.tuscany.sca.extensibility.ClassLoaderContext;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.monitor.MonitorFactory;
+import org.w3c.dom.DOMImplementation;
+import org.w3c.dom.ls.DOMImplementationLS;
+import org.w3c.dom.ls.LSInput;
+import org.w3c.dom.ls.LSResourceResolver;
+import org.xml.sax.InputSource;
+import org.xml.sax.SAXException;
+
+/**
+ * Default implementation of an XMLInputFactory that creates validating
+ * XMLStreamReaders.
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefaultValidatingXMLInputFactory extends ValidatingXMLInputFactory implements LSResourceResolver {
+    private ExtensionPointRegistry registry;
+    private XMLInputFactory inputFactory;
+    private DocumentBuilderFactory documentBuilderFactory;
+    private DOMImplementationLS ls;
+    private ValidationSchemaExtensionPoint schemas;
+    private MonitorFactory monitorFactory;
+    private boolean initialized;
+    private boolean hasSchemas;
+    private Schema aggregatedSchema;
+    private StAXHelper helper;
+
+    public DefaultValidatingXMLInputFactory(ExtensionPointRegistry registry) {
+        this.registry = registry;
+        FactoryExtensionPoint factoryExtensionPoint = registry.getExtensionPoint(FactoryExtensionPoint.class);
+        this.inputFactory = factoryExtensionPoint.getFactory(XMLInputFactory.class);
+        this.documentBuilderFactory = factoryExtensionPoint.getFactory(DocumentBuilderFactory.class);
+        this.schemas = registry.getExtensionPoint(ValidationSchemaExtensionPoint.class);
+        this.monitorFactory =
+            registry.getExtensionPoint(UtilityExtensionPoint.class).getUtility(MonitorFactory.class);
+        this.helper = StAXHelper.getInstance(registry);
+    }
+
+    /**
+     * Constructs a new XMLInputFactory.
+     *
+     * @param inputFactory
+     * @param schemas
+     */
+    // FOR Test only
+    public DefaultValidatingXMLInputFactory(XMLInputFactory inputFactory, ValidationSchemaExtensionPoint schemas) {
+        this.inputFactory = inputFactory;
+        this.schemas = schemas;
+        this.registry = new DefaultExtensionPointRegistry();
+    }
+    
+
+    /**
+     * Report a exception.
+     *
+     * @param problems
+     * @param message
+     * @param model
+     */
+    private void error(Monitor monitor, String message, Object model, Throwable ex) {
+        Monitor.error(monitor, this, "contribution-validation-messages", message, ex);
+    }
+
+    private void warn(Monitor monitor, String message, Object model, Throwable ex) {
+        Monitor.warning(monitor, this, "contribution-validation-messages", message, ex);
+    }
+    
+    public static final QName XSD = new QName(XMLConstants.W3C_XML_SCHEMA_NS_URI, "schema");
+
+    private Collection<? extends Source> aggregate(URL... urls) throws IOException, XMLStreamException {
+        if (urls.length == 1) {
+            return Collections.singletonList(new SAXSource(XMLDocumentHelper.getInputSource(urls[0])));
+        }
+        Map<String, Collection<URL>> map = new HashMap<String, Collection<URL>>();
+
+        for (URL url : urls) {
+            String tns = helper.readAttribute(url, XSD, "targetNamespace");
+            Collection<URL> collection = map.get(tns);
+            if (collection == null) {
+                collection = new HashSet<URL>();
+                map.put(tns, collection);
+            }
+            collection.add(url);
+        }
+        List<Source> sources = new ArrayList<Source>();
+        for (Map.Entry<String, Collection<URL>> e : map.entrySet()) {
+            if (e.getValue().size() == 1) {
+                sources.add(new SAXSource(XMLDocumentHelper.getInputSource(e.getValue().iterator().next())));
+            } else {
+                StringBuffer xsd = new StringBuffer("<schema xmlns=\"http://www.w3.org/2001/XMLSchema\"");
+                if (e.getKey() != null) {
+                    xsd.append(" targetNamespace=\"").append(e.getKey()).append("\"");
+                }
+                xsd.append(">");
+                for (URL url : e.getValue()) {
+                    xsd.append("<include schemaLocation=\"").append(url).append("\"/>");
+                }
+                xsd.append("</schema>");
+                SAXSource source = new SAXSource(new InputSource(new StringReader(xsd.toString())));
+                sources.add(source);
+            }
+        }
+        return sources;
+    }
+
+    /**
+     * Initialize the registered schemas and create an aggregated schema for
+     * validation.
+     * @param monitor TODO
+     */
+    private synchronized void initializeSchemas(Monitor monitor) {
+        if (initialized) {
+            return;
+        }
+        initialized = true;
+
+        // Load the XSDs registered in the validation schema extension point
+        try {
+            List<String> uris = schemas.getSchemas();
+            int n = uris.size();
+            if (n ==0) {
+                return;
+            } else {
+                hasSchemas = true;
+            }
+            
+            URL[] urls = new URL[uris.size()];
+            for (int i = 0; i < urls.length; i++) {
+                urls[i] = new URL(uris.get(i));
+            }
+            final Collection<? extends Source> sources = aggregate(urls);            
+
+            final SchemaFactory schemaFactory = newSchemaFactory();
+            DOMImplementation impl = null;
+            try {
+                impl = documentBuilderFactory.newDocumentBuilder().getDOMImplementation();
+            } catch (ParserConfigurationException e) {
+                // Ignore
+            }
+            if (impl instanceof DOMImplementationLS) {
+                ls = (DOMImplementationLS)impl;
+                schemaFactory.setResourceResolver(this);
+            }
+            // Allow privileged access to check files. Requires FilePermission
+            // in security policy.
+            try {
+                aggregatedSchema = AccessController.doPrivileged(new PrivilegedExceptionAction<Schema>() {
+                    public Schema run() throws SAXException {
+                        return schemaFactory.newSchema(sources.toArray(new Source[sources.size()]));
+                    }
+                });
+            } catch (PrivilegedActionException e) {
+            	warn(monitor, "PrivilegedActionException", schemaFactory, (SAXException)e.getException());
+            	hasSchemas = false;
+                throw (SAXException)e.getException();
+            }
+
+        } catch (SAXException e) {
+//            IllegalStateException ie = new IllegalStateException(e);
+//            error("IllegalStateException", schemas, ie);
+//            throw ie;
+        } catch (Throwable e) {
+            //FIXME Log this, some old JDKs don't support XMLSchema validation
+            warn(monitor, e.getMessage(), schemas, e);
+            hasSchemas = false;
+        }
+    }
+
+    /**
+     * For OSGi:
+     * Create a SchemaFactory in the context of service provider classloaders
+     * @return
+     */
+    private SchemaFactory newSchemaFactory() {
+        ClassLoader cl =
+            ClassLoaderContext.setContextClassLoader(getClass().getClassLoader(),
+                                                     registry.getServiceDiscovery(),
+                                                     SchemaFactory.class,
+                                                     TransformerFactory.class,
+                                                     SAXParserFactory.class,
+                                                     DocumentBuilderFactory.class
+                                                     );
+        try {
+            // Create an aggregated validation schemas from all the XSDs
+            return SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
+        } finally {
+            if (cl != null) {
+                Thread.currentThread().setContextClassLoader(cl);
+            }
+        }
+    }
+
+    @Override
+    public XMLEventReader createFilteredReader(XMLEventReader arg0, EventFilter arg1) throws XMLStreamException {
+        return inputFactory.createFilteredReader(arg0, arg1);
+    }
+
+    @Override
+    public XMLStreamReader createFilteredReader(XMLStreamReader arg0, StreamFilter arg1) throws XMLStreamException {
+        return inputFactory.createFilteredReader(arg0, arg1);
+    }
+
+    @Override
+    public XMLEventReader createXMLEventReader(InputStream arg0, String arg1) throws XMLStreamException {
+        return inputFactory.createXMLEventReader(arg0, arg1);
+    }
+
+    @Override
+    public XMLEventReader createXMLEventReader(InputStream arg0) throws XMLStreamException {
+        return inputFactory.createXMLEventReader(arg0);
+    }
+
+    @Override
+    public XMLEventReader createXMLEventReader(Reader arg0) throws XMLStreamException {
+        return inputFactory.createXMLEventReader(arg0);
+    }
+
+    @Override
+    public XMLEventReader createXMLEventReader(Source arg0) throws XMLStreamException {
+        return inputFactory.createXMLEventReader(arg0);
+    }
+
+    @Override
+    public XMLEventReader createXMLEventReader(String arg0, InputStream arg1) throws XMLStreamException {
+        return inputFactory.createXMLEventReader(arg0, arg1);
+    }
+
+    @Override
+    public XMLEventReader createXMLEventReader(String arg0, Reader arg1) throws XMLStreamException {
+        return inputFactory.createXMLEventReader(arg0, arg1);
+    }
+
+    @Override
+    public XMLEventReader createXMLEventReader(XMLStreamReader arg0) throws XMLStreamException {
+        return inputFactory.createXMLEventReader(arg0);
+    }
+
+    @Override
+    public XMLStreamReader createXMLStreamReader(InputStream arg0, String arg1) throws XMLStreamException {
+        Monitor monitor = monitorFactory.getContextMonitor();
+        initializeSchemas(monitor);
+        if (hasSchemas) {
+            return new ValidatingXMLStreamReader(inputFactory.createXMLStreamReader(arg0, arg1), aggregatedSchema, monitor);
+        }else {
+            return inputFactory.createXMLStreamReader(arg0, arg1);
+        }
+    }
+
+    @Override
+    public XMLStreamReader createXMLStreamReader(InputStream arg0) throws XMLStreamException {
+        Monitor monitor = monitorFactory.getContextMonitor();
+        initializeSchemas(monitor);
+        if (hasSchemas) {
+            return new ValidatingXMLStreamReader(inputFactory.createXMLStreamReader(arg0), aggregatedSchema, monitor);
+        } else {
+            return inputFactory.createXMLStreamReader(arg0);
+        }
+    }
+
+    @Override
+    public XMLStreamReader createXMLStreamReader(Reader arg0) throws XMLStreamException {
+        Monitor monitor = monitorFactory.getContextMonitor();
+        initializeSchemas(monitor);
+        if (hasSchemas) {
+            return new ValidatingXMLStreamReader(inputFactory.createXMLStreamReader(arg0), aggregatedSchema, monitor);
+        } else {
+            return inputFactory.createXMLStreamReader(arg0);
+        }
+    }
+
+    @Override
+    public XMLStreamReader createXMLStreamReader(Source arg0) throws XMLStreamException {
+        Monitor monitor = monitorFactory.getContextMonitor();
+        initializeSchemas(monitor);
+        if (hasSchemas) {
+            return new ValidatingXMLStreamReader(inputFactory.createXMLStreamReader(arg0), aggregatedSchema, monitor);
+        } else {
+            return inputFactory.createXMLStreamReader(arg0);
+        }
+    }
+
+    @Override
+    public XMLStreamReader createXMLStreamReader(String arg0, InputStream arg1) throws XMLStreamException {
+        Monitor monitor = monitorFactory.getContextMonitor();
+        initializeSchemas(monitor);
+        if (hasSchemas) {
+            return new ValidatingXMLStreamReader(inputFactory.createXMLStreamReader(arg0, arg1), aggregatedSchema, monitor);
+        } else {
+            return inputFactory.createXMLStreamReader(arg0, arg1);
+        }
+    }
+
+    @Override
+    public XMLStreamReader createXMLStreamReader(String arg0, Reader arg1) throws XMLStreamException {
+        Monitor monitor = monitorFactory.getContextMonitor();
+        initializeSchemas(monitor);
+        if (hasSchemas) {
+            return new ValidatingXMLStreamReader(inputFactory.createXMLStreamReader(arg0, arg1), aggregatedSchema, monitor);
+        } else {
+            return inputFactory.createXMLStreamReader(arg0, arg1);
+        }
+    }
+
+    @Override
+    public XMLEventAllocator getEventAllocator() {
+        return inputFactory.getEventAllocator();
+    }
+
+    @Override
+    public Object getProperty(String arg0) throws IllegalArgumentException {
+        return inputFactory.getProperty(arg0);
+    }
+
+    @Override
+    public XMLReporter getXMLReporter() {
+        return inputFactory.getXMLReporter();
+    }
+
+    @Override
+    public XMLResolver getXMLResolver() {
+        return inputFactory.getXMLResolver();
+    }
+
+    @Override
+    public boolean isPropertySupported(String arg0) {
+        return inputFactory.isPropertySupported(arg0);
+    }
+
+    @Override
+    public void setEventAllocator(XMLEventAllocator arg0) {
+        inputFactory.setEventAllocator(arg0);
+    }
+
+    @Override
+    public void setProperty(String arg0, Object arg1) throws IllegalArgumentException {
+        inputFactory.setProperty(arg0, arg1);
+    }
+
+    @Override
+    public void setXMLReporter(XMLReporter arg0) {
+        inputFactory.setXMLReporter(arg0);
+    }
+
+    @Override
+    public void setXMLResolver(XMLResolver arg0) {
+        inputFactory.setXMLResolver(arg0);
+    }
+
+    public LSInput resolveResource(String type, String namespaceURI, String publicId, String systemId, String baseURI) {
+        String key = null;
+        if("http://www.w3.org/2001/XMLSchema".equals(type)) {
+            key = namespaceURI;
+        } else if("http://www.w3.org/TR/REC-xml".equals(type)) {
+            key = publicId;
+        }
+        URL url = Constants.CACHED_XSDS.get(key);
+        if (url != null && !Constants.SCA11_NS.equals(namespaceURI)) {
+            systemId = url.toString();
+        } else if (url != null && systemId == null) {
+            systemId = url.toString();
+        } 
+
+        LSInput input = ls.createLSInput();
+        input.setBaseURI(baseURI);
+        input.setPublicId(publicId);
+        input.setSystemId(systemId);
+        return input;
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultValidationSchemaExtensionPoint.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultValidationSchemaExtensionPoint.java
new file mode 100644
index 0000000000..4cb83cd5ef
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultValidationSchemaExtensionPoint.java
@@ -0,0 +1,123 @@
+/*
+ * 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.contribution.processor;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
+
+/**
+ * Default implementation of an extension point for XML schemas.
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefaultValidationSchemaExtensionPoint implements ValidationSchemaExtensionPoint {
+    private boolean enabled = true;
+    private List<String> schemas = new ArrayList<String>();
+    private boolean loaded;
+    private ExtensionPointRegistry registry;
+    
+    public DefaultValidationSchemaExtensionPoint(ExtensionPointRegistry registry, Map<String, String> attributes) {
+        super();
+        this.registry = registry;
+        if (attributes != null) {
+            String attr = attributes.get("enabled");
+            if (attr != null) {
+                enabled = Boolean.parseBoolean(attr);
+            }
+        }
+    }
+    
+    public void addSchema(String uri) {
+        schemas.add(uri);
+    }
+
+    public void removeSchema(String uri) {
+        schemas.remove(uri);
+    }
+
+    /**
+     * Load schema declarations from META-INF/services/
+     * org.apache.tuscany.sca.contribution.processor.ValidationSchema files
+     */
+    private synchronized void loadSchemas() {
+        if (loaded || (!enabled))
+            return;
+
+        // Get the schema declarations
+        Collection<ServiceDeclaration> schemaDeclarations;
+        try {
+            schemaDeclarations =
+                registry.getServiceDiscovery()
+                    .getServiceDeclarations("org.apache.tuscany.sca.contribution.processor.ValidationSchema");
+        } catch (IOException e) {
+            throw new IllegalStateException(e);
+        }
+
+        // TODO - temp fix to ensure that the schema tuscany-sca.xsd always comes first
+        String tuscanyScaXsd = null;
+
+        // Find each schema
+        for (ServiceDeclaration schemaDeclaration : schemaDeclarations) {
+            URL url = schemaDeclaration.getResource(schemaDeclaration.getClassName());
+            if (url == null) {
+                throw new IllegalArgumentException(new FileNotFoundException(schemaDeclaration.getClassName()));
+            }
+
+            if (url.toString().contains("tuscany-sca-1.1.xsd")) {
+                tuscanyScaXsd = url.toString();
+            } else {
+                schemas.add(url.toString());
+            }
+        }
+
+        if (tuscanyScaXsd != null) {
+            schemas.add(0, tuscanyScaXsd);
+        }
+
+        loaded = true;
+    }
+
+    public List<String> getSchemas() {
+        if (enabled) {
+            loadSchemas();
+            return schemas;
+        } else {
+            return Collections.emptyList();
+        }
+    }
+
+    public boolean isEnabled() {
+        return enabled;
+    }
+
+    public void setEnabled(boolean enabled) {
+        this.enabled = enabled;
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ExtendedArtifactProcessor.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ExtendedArtifactProcessor.java
new file mode 100644
index 0000000000..ca579110ae
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ExtendedArtifactProcessor.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.contribution.processor;
+
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+
+/**
+ * Interface for extended Artifact Processors which require a pre-resolve phase prior to the resolve phase
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface ExtendedArtifactProcessor<M> extends ArtifactProcessor<M> {
+    
+    /**
+     * Pre-resolve references from this model to other models. Used for models where initial setup of
+     * the resolve phase is required.  An example is Contribution models with imports and exports which must
+     * be set up prior to the main resolve phase
+     * 
+     * @param model The model to resolve
+     * @param resolver The resolver to use to resolve referenced models
+     * @param context The context
+     */
+    void preResolve(M model, ModelResolver resolver, ProcessorContext context) throws ContributionResolveException;
+    
+} // end interface
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ExtendedURLArtifactProcessor.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ExtendedURLArtifactProcessor.java
new file mode 100644
index 0000000000..2639a21e41
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ExtendedURLArtifactProcessor.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.contribution.processor;
+
+
+/**
+ * An extended artifact processor that can read models from a URL.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface ExtendedURLArtifactProcessor<M> extends ExtendedArtifactProcessor<M>, URLArtifactProcessor<M> {
+
+} // end interface
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ExtensibleStAXArtifactProcessor.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ExtensibleStAXArtifactProcessor.java
new file mode 100644
index 0000000000..132b7a8858
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ExtensibleStAXArtifactProcessor.java
@@ -0,0 +1,283 @@
+/*
+ * 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.contribution.processor;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import javax.xml.namespace.QName;
+import javax.xml.stream.Location;
+import javax.xml.stream.XMLInputFactory;
+import javax.xml.stream.XMLOutputFactory;
+import javax.xml.stream.XMLStreamConstants;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+import javax.xml.stream.XMLStreamWriter;
+
+import org.apache.tuscany.sca.assembly.Extension;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.monitor.Problem;
+import org.apache.tuscany.sca.monitor.Problem.Severity;
+
+/**
+ * Implementation of an extensible StAX artifact processor.
+ *
+ * Takes a StAXArtifactProcessorExtensionPoint and delegates to the proper
+ * StAXArtifactProcessor by element QName
+ *
+ * @version $Rev$ $Date$
+ */
+public class ExtensibleStAXArtifactProcessor implements StAXArtifactProcessor<Object> {
+    private static final Logger logger = Logger.getLogger(ExtensibleStAXArtifactProcessor.class.getName());
+    private static final String XMLSCHEMA_NS = "http://www.w3.org/2001/XMLSchema";
+    public static final QName ANY_ELEMENT = new QName(XMLSCHEMA_NS, "any");
+
+    private XMLInputFactory inputFactory;
+    private XMLOutputFactory outputFactory;
+    private StAXArtifactProcessorExtensionPoint processors;
+
+    /**
+     * Constructs a new ExtensibleStAXArtifactProcessor.
+     * @param processors
+     * @param inputFactory
+     * @param outputFactory
+     */
+    public ExtensibleStAXArtifactProcessor(StAXArtifactProcessorExtensionPoint processors,
+                                           XMLInputFactory inputFactory,
+                                           XMLOutputFactory outputFactory) {
+        super();
+        this.processors = processors;
+        this.inputFactory = inputFactory;
+        this.outputFactory = outputFactory;
+        if (this.outputFactory != null) {
+            this.outputFactory.setProperty(XMLOutputFactory.IS_REPAIRING_NAMESPACES, Boolean.TRUE);
+        }
+    }
+    
+    public ExtensibleStAXArtifactProcessor(ExtensionPointRegistry registry) {
+        super();
+        this.processors = registry.getExtensionPoint(StAXArtifactProcessorExtensionPoint.class);
+        FactoryExtensionPoint factories = registry.getExtensionPoint(FactoryExtensionPoint.class);
+        this.inputFactory = factories.getFactory(XMLInputFactory.class);
+        this.outputFactory = factories.getFactory(XMLOutputFactory.class);
+        if (this.outputFactory != null) {
+            this.outputFactory.setProperty(XMLOutputFactory.IS_REPAIRING_NAMESPACES, Boolean.TRUE);
+        }
+    }
+
+    /**
+     * Report a warning.
+     *
+     * @param problems
+     * @param message
+     * @param model
+     */
+    private void warning(Monitor monitor, String message, Object model, Object... messageParameters) {
+        if (monitor != null) {
+            Problem problem =
+                monitor.createProblem(this.getClass().getName(),
+                                      "contribution-validation-messages",
+                                      Severity.WARNING,
+                                      model,
+                                      message,
+                                      (Object[])messageParameters);
+            monitor.problem(problem);
+        }
+    }
+
+    /**
+     * Report a error.
+     *
+     * @param problems
+     * @param message
+     * @param model
+     */
+    private void error(Monitor monitor, String message, Object model, Object... messageParameters) {
+        if (monitor != null) {
+            Problem problem =
+                monitor.createProblem(this.getClass().getName(),
+                                      "contribution-validation-messages",
+                                      Severity.ERROR,
+                                      model,
+                                      message,
+                                      (Object[])messageParameters);
+            monitor.problem(problem);
+        }
+    }
+
+    /**
+     * Report a exception.
+     *
+     * @param problems
+     * @param message
+     * @param model
+     */
+    private void error(Monitor monitor, String message, Object model, Exception ex) {
+        if (monitor != null) {
+            Problem problem =
+                monitor.createProblem(this.getClass().getName(),
+                                      "contribution-validation-messages",
+                                      Severity.ERROR,
+                                      model,
+                                      message,
+                                      ex);
+            monitor.problem(problem);
+        }
+    }
+
+    public Object read(XMLStreamReader source, ProcessorContext context) throws ContributionReadException, XMLStreamException {
+        Monitor monitor = context.getMonitor();
+        // Delegate to the processor associated with the element QName
+        int event = source.getEventType();
+        if (event == XMLStreamConstants.START_DOCUMENT) {
+            source.nextTag();
+        }
+        QName name = source.getName();
+        StAXArtifactProcessor<?> processor = (StAXArtifactProcessor<?>)processors.getProcessor(name);
+        if (processor == null) {
+            Location location = source.getLocation();
+            error(monitor, "ElementCannotBeProcessed", processors, name, location);
+
+            StAXArtifactProcessor anyElementProcessor = processors.getProcessor(ANY_ELEMENT);
+            if (anyElementProcessor != null) {
+                return anyElementProcessor.read(source, context);
+            } else {
+                return null;
+            }
+        }
+        return processor.read(source, context);
+    }
+
+    @SuppressWarnings("unchecked")
+    public void write(Object model, XMLStreamWriter outputSource, ProcessorContext context) throws ContributionWriteException, XMLStreamException {
+        // Delegate to the processor associated with the model type
+        if (model != null) {
+            StAXArtifactProcessor processor = processors.getProcessor(model.getClass());
+            if (processor != null) {
+                processor.write(model, outputSource, context);
+            } else {
+                if (logger.isLoggable(Level.WARNING)) {
+                    logger.warning("No StAX processor is configured to handle " + model.getClass());
+                }
+                StAXArtifactProcessor anyElementProcessor = processors.getProcessor(ANY_ELEMENT);
+                if ((model instanceof Extension) && anyElementProcessor != null) {
+                    anyElementProcessor.write(model, outputSource, context);
+                }
+            }
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    public void resolve(Object model, ModelResolver resolver, ProcessorContext context) throws ContributionResolveException {
+
+        // Delegate to the processor associated with the model type
+        if (model != null) {
+            StAXArtifactProcessor processor = processors.getProcessor(model.getClass());
+            if (processor != null) {
+                processor.resolve(model, resolver, context);
+            }
+        }
+    }
+
+    /**
+     * Read a model from an InputStream.
+     * @param is The artifact InputStream
+     * @param type Model type
+     * @param context TODO
+     * @return The model
+     * @throws ContributionReadException
+     */
+    public <M> M read(InputStream is, Class<M> type, ProcessorContext context) throws ContributionReadException {
+        Monitor monitor = context.getMonitor();
+        try {
+            XMLStreamReader reader;
+            try {
+                reader = inputFactory.createXMLStreamReader(is);
+                try {
+                    reader.nextTag();
+                    QName name = reader.getName();
+                    Object mo = read(reader, context);
+                    if (type.isInstance(mo)) {
+                        return type.cast(mo);
+                    } else {
+                        error(monitor, "UnrecognizedElementException", reader, name);
+                        UnrecognizedElementException e = new UnrecognizedElementException(name);
+                        throw e;
+                    }
+                } catch (ContributionReadException e) {
+                    Location location = reader.getLocation();
+                    e.setLine(location.getLineNumber());
+                    e.setColumn(location.getColumnNumber());
+                    error(monitor, "ContributionReadException", reader, e);
+                    throw e;
+                } finally {
+                    try {
+                        reader.close();
+                    } catch (XMLStreamException e) {
+                        // ignore
+                    }
+                }
+            } finally {
+                try {
+                    is.close();
+                } catch (IOException e) {
+                    // ignore
+                }
+            }
+        } catch (XMLStreamException e) {
+            ContributionReadException ce = new ContributionReadException(e);
+            error(monitor, "ContributionReadException", inputFactory, ce);
+            throw ce;
+        }
+    }
+
+    /**
+     * Write a model to an OutputStream.
+     * @param model
+     * @param os
+     * @param context 
+     * @throws ContributionWriteException
+     */
+    public void write(Object model, OutputStream os, ProcessorContext context) throws ContributionWriteException {
+        try {
+            XMLStreamWriter writer = outputFactory.createXMLStreamWriter(os);
+            write(model, writer, context);
+            writer.flush();
+            writer.close();
+        } catch (XMLStreamException e) {
+            ContributionWriteException cw = new ContributionWriteException(e);
+            error(context.getMonitor(), "ContributionWriteException", outputFactory, cw);
+            throw cw;
+        }
+    }
+
+    public QName getArtifactType() {
+        return null;
+    }
+
+    public Class<Object> getModelType() {
+        return null;
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ExtensibleStAXAttributeProcessor.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ExtensibleStAXAttributeProcessor.java
new file mode 100644
index 0000000000..5bf7e88779
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ExtensibleStAXAttributeProcessor.java
@@ -0,0 +1,259 @@
+/*
+ * 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.contribution.processor;
+
+import static javax.xml.XMLConstants.W3C_XML_SCHEMA_INSTANCE_NS_URI;
+
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import javax.xml.namespace.QName;
+import javax.xml.stream.Location;
+import javax.xml.stream.XMLInputFactory;
+import javax.xml.stream.XMLOutputFactory;
+import javax.xml.stream.XMLStreamConstants;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+import javax.xml.stream.XMLStreamWriter;
+
+import org.apache.tuscany.sca.assembly.Extension;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.monitor.Problem;
+import org.apache.tuscany.sca.monitor.Problem.Severity;
+
+/**
+ * Implementation of an extensible StAX attribute processor.
+ *
+ * Takes a StAXAttributeProcessorExtensionPoint and delegates to the proper
+ * StAXAttributeProcessor by attribute QName
+ *
+ * @version $Rev$ $Date$
+ */
+public class ExtensibleStAXAttributeProcessor implements StAXAttributeProcessor<Object> {
+
+    private static final Logger logger = Logger.getLogger(ExtensibleStAXAttributeProcessor.class.getName());
+    private static final String XMLSCHEMA_NS = "http://www.w3.org/2001/XMLSchema";
+    public static final QName ANY_ATTRIBUTE = new QName(XMLSCHEMA_NS, "anyAttribute");
+
+    private XMLInputFactory inputFactory;
+    private XMLOutputFactory outputFactory;
+    private StAXAttributeProcessorExtensionPoint processors;
+    /**
+     * Constructs a new ExtensibleStAXArtifactProcessor.
+     * @param processors
+     * @param inputFactory
+     * @param outputFactory
+     */
+    public ExtensibleStAXAttributeProcessor(StAXAttributeProcessorExtensionPoint processors,
+                                            XMLInputFactory inputFactory,
+                                            XMLOutputFactory outputFactory) {
+        super();
+        this.processors = processors;
+        this.inputFactory = inputFactory;
+        this.outputFactory = outputFactory;
+        if (this.outputFactory != null) {
+            this.outputFactory.setProperty(XMLOutputFactory.IS_REPAIRING_NAMESPACES, Boolean.TRUE);
+        }
+    }
+
+    /**
+     * Report a warning.
+     *
+     * @param problems
+     * @param message
+     * @param model
+     */
+    private void warning(Monitor monitor, String message, Object model, Object... messageParameters) {
+        if (monitor != null) {
+            Problem problem =
+                monitor.createProblem(this.getClass().getName(),
+                                      "contribution-validation-messages",
+                                      Severity.WARNING,
+                                      model,
+                                      message,
+                                      (Object[])messageParameters);
+            monitor.problem(problem);
+        }
+    }
+
+    /**
+     * Report a error.
+     *
+     * @param problems
+     * @param message
+     * @param model
+     */
+    private void error(Monitor monitor, String message, Object model, Object... messageParameters) {
+        if (monitor != null) {
+            Problem problem =
+                monitor.createProblem(this.getClass().getName(),
+                                      "contribution-validation-messages",
+                                      Severity.ERROR,
+                                      model,
+                                      message,
+                                      (Object[])messageParameters);
+            monitor.problem(problem);
+        }
+    }
+
+    /**
+     * Report a exception.
+     *
+     * @param problems
+     * @param message
+     * @param model
+     */
+    private void error(Monitor monitor, String message, Object model, Exception ex) {
+        if (monitor != null) {
+            Problem problem =
+                monitor.createProblem(this.getClass().getName(),
+                                      "contribution-validation-messages",
+                                      Severity.ERROR,
+                                      model,
+                                      message,
+                                      ex);
+            monitor.problem(problem);
+        }
+    }
+
+    public Object read(QName attributeName, XMLStreamReader source, ProcessorContext context) throws ContributionReadException,
+        XMLStreamException {
+        // Delegate to the processor associated with the attribute QName
+        int event = source.getEventType();
+        if (event == XMLStreamConstants.START_DOCUMENT) {
+            while (source.next() != XMLStreamReader.START_ELEMENT);
+        }
+
+        StAXAttributeProcessor<?> processor = null;
+
+        //lookup for registered attribute processors
+        processor = (StAXAttributeProcessor<?>)processors.getProcessor(attributeName);
+        if (processor == null) {
+            Location location = source.getLocation();
+            // Skip xsi:type, xsi:nil and xsi:schemaLocation etc
+            if (!W3C_XML_SCHEMA_INSTANCE_NS_URI.equals(attributeName.getNamespaceURI())) {
+                if (logger.isLoggable(Level.WARNING)) {
+                    logger.warning("Attribute " + attributeName + " cannot be processed. (" + location + ")");
+                }
+                warning(context.getMonitor(), "AttributeCannotBeProcessed", processors, attributeName, location);
+            }
+        } else {
+            return processor.read(attributeName, source, context);
+        }
+
+        //handle extension attributes without processors
+        processor = (StAXAttributeProcessor<?>)processors.getProcessor(ANY_ATTRIBUTE);
+        if (processor == null) {
+            Location location = source.getLocation();
+            if (logger.isLoggable(Level.WARNING)) {
+                logger.warning("Could not find Default Attribute processor !");
+            }
+            warning(context.getMonitor(), "DefaultAttributeProcessorNotAvailable", processors, ANY_ATTRIBUTE, location);
+        }
+
+        return processor == null ? null : processor.read(attributeName, source, context);
+    }
+
+    @SuppressWarnings("unchecked")
+    public void write(Object model, XMLStreamWriter outputSource, ProcessorContext context) throws ContributionWriteException, XMLStreamException {
+
+        if (model == null) {
+            return;
+        }
+
+        // Delegate to the processor associated with the model type
+        StAXAttributeProcessor processor = processors.getProcessor(model.getClass());
+        if (processor == null) {
+            if (!Extension.class.isInstance(model)) {
+                if (logger.isLoggable(Level.WARNING)) {
+                    logger.warning("No StAX processor is configured to handle " + model.getClass());
+                }
+                warning(context.getMonitor(), "NoStaxProcessor", processors, model.getClass());
+            }
+        } else {
+            processor.write(model, outputSource, context);
+            return;
+        }
+
+        //handle extension attributes without processors
+        processor = (StAXAttributeProcessor<?>)processors.getProcessor(ANY_ATTRIBUTE);
+        if (processor == null) {
+            if (logger.isLoggable(Level.WARNING)) {
+                logger.warning("No Default StAX processor is configured to handle " + model.getClass());
+            }
+            warning(context.getMonitor(), "NoDefaultStaxProcessor", processors, model.getClass());
+        } else {
+            processor.write(model, outputSource, context);
+            return;
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    public void resolve(Object model, ModelResolver resolver, ProcessorContext context) throws ContributionResolveException {
+
+        // Delegate to the processor associated with the model type
+        if (model != null) {
+            StAXAttributeProcessor processor = processors.getProcessor(model.getClass());
+            if (processor != null) {
+                processor.resolve(model, resolver, context);
+            }
+        }
+    }
+
+    /**
+     * Read a model from an InputStream.
+     * @param is The artifact InputStream
+     * @param type Model type
+     * @return The model
+     * @throws ContributionReadException
+     */
+    public <M> M read(InputStream is, Class<M> type) throws ContributionReadException {
+        return null;
+    }
+
+    /**
+     * Write a model to an OutputStream.
+     * @param model
+     * @param os
+     * @throws ContributionWriteException
+     */
+    public void write(Object model, OutputStream os, ProcessorContext context) throws ContributionWriteException {
+        try {
+            XMLStreamWriter writer = outputFactory.createXMLStreamWriter(os);
+            write(model, writer, context);
+            writer.flush();
+            writer.close();
+        } catch (XMLStreamException e) {
+            ContributionWriteException cw = new ContributionWriteException(e);
+            error(context.getMonitor(), "ContributionWriteException", outputFactory, cw);
+            throw cw;
+        }
+    }
+
+    public QName getArtifactType() {
+        return null;
+    }
+
+    public Class<Object> getModelType() {
+        return Object.class;
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ExtensibleURLArtifactProcessor.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ExtensibleURLArtifactProcessor.java
new file mode 100644
index 0000000000..2491e22a29
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ExtensibleURLArtifactProcessor.java
@@ -0,0 +1,148 @@
+/*
+ * 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.contribution.processor;
+
+import java.net.URI;
+import java.net.URL;
+
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.monitor.Problem;
+import org.apache.tuscany.sca.monitor.Problem.Severity;
+
+/**
+ * Implementation of an extensible URL artifact processor.
+ * 
+ * Takes a URLArtifactProcessorExtensionPoint and delegates to the proper URLArtifactProcessor
+ * by either fileName or fileExtention
+ * 
+ * @version $Rev$ $Date$
+ */
+public class ExtensibleURLArtifactProcessor implements URLArtifactProcessor<Object> {
+
+    private URLArtifactProcessorExtensionPoint processors;
+
+    /**
+     * Constructs a new ExtensibleURLArtifactProcessor.
+     * 
+     * @param processors
+     */
+    public ExtensibleURLArtifactProcessor(URLArtifactProcessorExtensionPoint processors) {
+        this.processors = processors;
+    }
+
+    /**
+     * Report a error.
+     * 
+     * @param problems
+     * @param message
+     * @param model
+     */
+    private void error(Monitor monitor, String message, Object model, Object... messageParameters) {
+        if (monitor != null) {
+            Problem problem =
+                monitor.createProblem(this.getClass().getName(),
+                                      "contribution-validation-messages",
+                                      Severity.ERROR,
+                                      model,
+                                      message,
+                                      (Object[])messageParameters);
+            monitor.problem(problem);
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    public Object read(URL contributionURL, URI sourceURI, URL sourceURL, ProcessorContext context) throws ContributionReadException {
+        URLArtifactProcessor<Object> processor = null;
+        if (sourceURI != null) {
+            //try to retrieve a processor for the specific URI
+            String uri = sourceURI.toString();
+            if (!uri.startsWith("/")) {
+                uri = "/" + uri;
+            }
+            // Register the URI as the artifact type starts with /
+            processor = (URLArtifactProcessor<Object>)processors.getProcessor(uri);
+        }
+        
+        /*
+        if (processor == null) {
+            // Delegate to the processor associated with file extension
+            String fileName = getFileName(sourceURL);
+
+            //try to retrieve a processor for the specific filename
+            processor = (URLArtifactProcessor<Object>)processors.getProcessor(fileName);
+        }
+
+        if (processor == null) {
+            //try to find my file type (extension)
+            String extension = sourceURL.getPath();
+
+            int extensionStart = extension.lastIndexOf('.');
+            //handle files without extension (e.g NOTICE)
+            if (extensionStart > 0) {
+                // File extensions are registered as .<extension>
+                extension = extension.substring(extensionStart);
+                processor = (URLArtifactProcessor<Object>)processors.getProcessor(extension);
+            }
+        }
+        */
+
+        if (processor == null) {
+            return null;
+        }
+        if (context != null && context.getMonitor() != null){
+            context.getMonitor().setArtifactName(null); //Reset Artifact Name in Monitor   
+        }
+        return processor.read(contributionURL, sourceURI, sourceURL, context);
+    }
+
+    @SuppressWarnings("unchecked")
+    public void resolve(Object model, ModelResolver resolver, ProcessorContext context) throws ContributionResolveException {
+
+        // Delegate to the processor associated with the model type
+        if (model != null) {
+            URLArtifactProcessor processor = processors.getProcessor(model.getClass());
+            if (processor != null) {
+                processor.resolve(model, resolver, context);
+            }
+        }
+    }
+
+    public <M> M read(URL contributionURL, URI artifactURI, URL artifactUrl, ProcessorContext context, Class<M> type)
+        throws ContributionReadException {
+        Object mo = read(contributionURL, artifactURI, artifactUrl, context);
+        if (type.isInstance(mo)) {
+            return type.cast(mo);
+        } else {
+            UnrecognizedElementException e = new UnrecognizedElementException(null);
+            e.setResourceURI(artifactURI.toString());
+            error(context.getMonitor(), "UnrecognizedElementException", processors, artifactURI.toString());
+            throw e;
+        }
+    }
+
+    public String getArtifactType() {
+        return "";
+    }
+
+    public Class<Object> getModelType() {
+        return Object.class;
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ProcessorContext.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ProcessorContext.java
new file mode 100644
index 0000000000..d464af40f2
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ProcessorContext.java
@@ -0,0 +1,127 @@
+/*
+ * 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.contribution.processor;
+
+import org.apache.tuscany.sca.contribution.Artifact;
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.core.UtilityExtensionPoint;
+import org.apache.tuscany.sca.monitor.DefaultMonitorFactory;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.monitor.MonitorFactory;
+
+/**
+ * Context for contribution processors
+ * @tuscany.spi.extension.asclient
+ */
+public class ProcessorContext {
+    protected Contribution contribution;
+    protected Artifact artifact;
+    protected Monitor monitor;
+    protected Object parentModel;
+
+    /**
+     * @param contribution
+     * @param monitor
+     */
+    public ProcessorContext(Contribution contribution, Monitor monitor) {
+        super();
+        this.contribution = contribution;
+        this.monitor = monitor;
+    }
+
+    public ProcessorContext(Monitor monitor) {
+        super();
+        this.monitor = monitor;
+    }
+    
+    public ProcessorContext(ExtensionPointRegistry registry) {
+        super();
+        MonitorFactory monitorFactory =
+            registry.getExtensionPoint(UtilityExtensionPoint.class).getUtility(MonitorFactory.class);
+        this.monitor = monitorFactory.createMonitor();
+    }
+
+    public ProcessorContext() {
+        super();
+        this.monitor = new DefaultMonitorFactory().createMonitor();
+    }
+
+    /**
+     * Get the current contribution
+     * @return The current contribution
+     */
+    public Contribution getContribution() {
+        return contribution;
+    }
+
+    /**
+     * Set the current contribution
+     * @param contribution
+     * @return
+     */
+    public Contribution setContribution(Contribution contribution) {
+        Contribution old = this.contribution;
+        this.contribution = contribution;
+        return old;
+    }
+
+    public Monitor getMonitor() {
+        return monitor;
+    }
+
+    public Monitor setMonitor(Monitor monitor) {
+        Monitor old = this.monitor;
+        this.monitor = monitor;
+        return old;
+    }
+
+    public Object getParentModel() {
+        return parentModel;
+    }
+
+    public Object setParentModel(Object parentMObject) {
+        Object old = this.parentModel;
+        this.parentModel = parentMObject;
+        return old;
+    }
+
+    /**
+     * Get the current artifact
+     * @return The current artifact
+     */
+    public Artifact getArtifact() {
+        return artifact;
+    }
+
+    /**
+     * Set the current artifact. This should be called by URLArtifactProcessor to set the document
+     * context (such as the URI of the composite file).
+     * 
+     * @param artifact The new artifact
+     * @return The old artifact
+     */
+    public Artifact setArtifact(Artifact artifact) {
+        Artifact old = this.artifact;
+        this.artifact = artifact;
+        return old;
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/StAXArtifactProcessor.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/StAXArtifactProcessor.java
new file mode 100644
index 0000000000..cbdb5c38a0
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/StAXArtifactProcessor.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.contribution.processor;
+
+import javax.xml.namespace.QName;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+import javax.xml.stream.XMLStreamWriter;
+
+
+/**
+ * An artifact processor that can read models from a StAX XMLStreamReader.
+ * 
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.inheritfrom
+ */
+public interface StAXArtifactProcessor<M> extends ArtifactProcessor<M> {
+
+    /**
+     * Reads a model from an XMLStreamReader.
+     * 
+     * @param reader The XMLStreamReader
+     * @param context The context
+     * @return A model representation of the input.
+     */
+    M read(XMLStreamReader reader, ProcessorContext context) throws ContributionReadException, XMLStreamException;
+    
+    /**
+     * Writes a model to an XMLStreamWriter.
+     * 
+     * @param model A model representing the source
+     * @param writer The XML stream writer
+     * @param context TODO
+     * @throws ContributionWriteException
+     * @throws XMLStreamException
+     */
+    void write(M model, XMLStreamWriter writer, ProcessorContext context) throws ContributionWriteException, XMLStreamException;
+    
+    /**
+     * Returns the type of artifact handled by this artifact processor.
+     *  
+     * @return The type of artifact handled by this artifact processor
+     */
+    QName getArtifactType();
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/StAXArtifactProcessorExtensionPoint.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/StAXArtifactProcessorExtensionPoint.java
new file mode 100644
index 0000000000..a5c66bc1ee
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/StAXArtifactProcessorExtensionPoint.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.contribution.processor;
+
+/**
+ * An extension point for StAX artifact processors.
+ *
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.asclient
+ */
+public interface StAXArtifactProcessorExtensionPoint {
+    /**
+     * Add an artifact processor.
+     *
+     * @param artifactProcessor The artifact processor to add
+     */
+    void addArtifactProcessor(StAXArtifactProcessor<?> artifactProcessor);
+
+    /**
+     * Remove an artifact processor.
+     *
+     * @param artifactProcessor The artifact processor to remove
+     */
+    void removeArtifactProcessor(StAXArtifactProcessor<?> artifactProcessor);
+
+    /**
+     * Returns the processor associated with the given artifact type.
+     *
+     * @param artifactType An artifact type
+     * @return The processor associated with the given artifact type
+     */
+    <T> StAXArtifactProcessor<T> getProcessor(Object artifactType);
+
+    /**
+     * Returns the processor associated with the given model type.
+     *
+     * @param modelType A model type
+     * @return The processor associated with the given model type
+     */
+    <T> StAXArtifactProcessor<T> getProcessor(Class<T> modelType);
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/StAXAttributeProcessor.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/StAXAttributeProcessor.java
new file mode 100644
index 0000000000..e9fca5fc4c
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/StAXAttributeProcessor.java
@@ -0,0 +1,64 @@
+/*
+ * 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.contribution.processor;
+
+import javax.xml.namespace.QName;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+import javax.xml.stream.XMLStreamWriter;
+
+
+
+/**
+ * An artifact processor that can read attributes from a StAX XMLStreamReader.
+ * 
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.asclient
+ */
+public interface StAXAttributeProcessor<M> extends ArtifactProcessor<M>{
+
+    /**
+     * Reads a model from an XMLStreamReader.
+     * @param reader The XMLStreamReader
+     * @param context The context
+     * 
+     * @return A model representation of the input.
+     */
+    M read(QName attributeName, XMLStreamReader reader, ProcessorContext context) throws ContributionReadException, XMLStreamException;
+    
+    /**
+     * Writes a model to an XMLStreamWriter.
+     * 
+     * @param model A model representing the source
+     * @param writer The XML stream writer
+     * @param context The context
+     * @throws ContributionWriteException
+     * @throws XMLStreamException
+     */
+    void write(M model, XMLStreamWriter writer, ProcessorContext context) throws ContributionWriteException, XMLStreamException;
+    
+    /**
+     * Returns the type of artifact handled by this artifact processor.
+     *  
+     * @return The type of artifact handled by this artifact processor
+     */
+    QName getArtifactType();
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/StAXAttributeProcessorExtensionPoint.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/StAXAttributeProcessorExtensionPoint.java
new file mode 100644
index 0000000000..dbc0a2c7bc
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/StAXAttributeProcessorExtensionPoint.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.contribution.processor;
+
+/**
+ * An extension point for StAX artifact processors.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface StAXAttributeProcessorExtensionPoint {
+    /**
+     * Add an artifact processor.
+     *
+     * @param artifactProcessor The artifact processor to add
+     */
+    void addArtifactProcessor(StAXAttributeProcessor<?> artifactProcessor);
+
+    /**
+     * Remove an artifact processor.
+     *
+     * @param artifactProcessor The artifact processor to remove
+     */
+    void removeArtifactProcessor(StAXAttributeProcessor<?> artifactProcessor);
+
+    /**
+     * Returns the processor associated with the given artifact type.
+     *
+     * @param artifactType An artifact type
+     * @return The processor associated with the given artifact type
+     */
+    <T> StAXAttributeProcessor<T> getProcessor(Object artifactType);
+
+    /**
+     * Returns the processor associated with the given model type.
+     *
+     * @param modelType A model type
+     * @return The processor associated with the given model type
+     */
+    <T> StAXAttributeProcessor<T> getProcessor(Class<T> modelType);
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/URLArtifactProcessor.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/URLArtifactProcessor.java
new file mode 100644
index 0000000000..035a753649
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/URLArtifactProcessor.java
@@ -0,0 +1,52 @@
+/*
+ * 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.contribution.processor;
+
+import java.net.URI;
+import java.net.URL;
+
+
+/**
+ * An artifact processor that can read models from a URL.
+ * 
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.inheritfrom
+ */
+public interface URLArtifactProcessor<M> extends ArtifactProcessor<M> {
+
+    /**
+     * Reads a model from a URL.
+     * 
+     * @param contributionURL Contribution location URL
+     * @param artifactURI Artifact URI
+     * @param artifactURL Artifact location URL 
+     * @param context The context
+     * @return A model representation of the input.
+     */
+    M read(URL contributionURL, URI artifactURI, URL artifactURL, ProcessorContext context) throws ContributionReadException;
+    
+    /**
+     * Returns the type of artifact handled by this artifact processor.
+     *  
+     * @return The type of artifact handled by this artifact processor
+     */
+    String getArtifactType();
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/URLArtifactProcessorExtensionPoint.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/URLArtifactProcessorExtensionPoint.java
new file mode 100644
index 0000000000..e5b3492767
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/URLArtifactProcessorExtensionPoint.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.contribution.processor;
+
+import java.util.Collection;
+
+/**
+ * An extension point for URL artifact processors.
+ *
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.asclient
+ */
+public interface URLArtifactProcessorExtensionPoint {
+    /**
+     * Add an artifact processor.
+     *
+     * @param artifactProcessor The artifact processor to add
+     */
+    void addArtifactProcessor(URLArtifactProcessor<?> artifactProcessor);
+
+    /**
+     * Remove an artifact processor.
+     *
+     * @param artifactProcessor The artifact processor to remove
+     */
+    void removeArtifactProcessor(URLArtifactProcessor<?> artifactProcessor);
+
+    /**
+     * Returns the processor associated with the given artifact type.
+     *
+     * @param artifactType An artifact type
+     * @return The processor associated with the given artifact type
+     */
+    <T> URLArtifactProcessor<T> getProcessor(Object artifactType);
+
+    /**
+     * Returns the processor associated with the given model type.
+     *
+     * @param modelType A model type
+     * @return The processor associated with the given model type
+     */
+    <T> URLArtifactProcessor<T> getProcessor(Class<T> modelType);
+
+    /**
+     * Return a collection of artifact processors that match the artifactType
+     * @param artifactType
+     * @return A collection of processors
+     */
+    Collection<URLArtifactProcessor<?>> getProcessors(Object artifactType);
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/UnrecognizedElementException.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/UnrecognizedElementException.java
new file mode 100644
index 0000000000..4c6f0b7282
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/UnrecognizedElementException.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.contribution.processor;
+
+import javax.xml.namespace.QName;
+
+/**
+ * Exception that indicates an element was encountered that could not be handled.
+ *
+ * @version $Rev$ $Date$
+ */
+public class UnrecognizedElementException extends ContributionReadException {
+    private static final long serialVersionUID = 2549543622209829032L;
+    private final QName element;
+
+    /**
+     * Constructor that indicates which element could not be handled.
+     * @param element the element that could not be handled
+     */
+    public UnrecognizedElementException(QName element) {
+        super("Unrecognized element: " + element);
+        this.element = element;
+    }
+
+    /**
+     * Returns the element that could not be handled.
+     * @return the element that could not be handled.
+     */
+    public QName getElement() {
+        return element;
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/UnsupportedContentTypeException.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/UnsupportedContentTypeException.java
new file mode 100644
index 0000000000..8a166e42f0
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/UnsupportedContentTypeException.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.contribution.processor;
+
+
+/**
+ * Exception thrown to indicate that a Content-Type is not supported by this SCA Domain.
+ * The Content-Type value supplied will be returned as the message text for this exception.
+ * 
+ * FIXME Don't use as it's deprecated and replaced by UnsupportedPackageTypeException.
+ *
+ * @version $Rev$ $Date$
+ */
+@Deprecated
+public class UnsupportedContentTypeException extends ContributionException {
+    private static final long serialVersionUID = -1831797280021355672L;
+
+    /**
+     * Constructs a new UnsupportedContentTypeException.
+     *
+     * @param message
+     */
+    public UnsupportedContentTypeException(String message) {
+        super(message);
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/UnsupportedPackageTypeException.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/UnsupportedPackageTypeException.java
new file mode 100644
index 0000000000..ce94cef6a0
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/UnsupportedPackageTypeException.java
@@ -0,0 +1,40 @@
+/*
+ * 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.contribution.processor;
+
+
+/**
+ * Exception thrown to indicate that a Content-Type is not supported by this SCA Domain.
+ * The Content-Type value supplied will be returned as the message text for this exception.
+ *
+ * @version $Rev$ $Date$
+ */
+public class UnsupportedPackageTypeException extends ContributionException {
+    private static final long serialVersionUID = -1831797280021355672L;
+
+    /**
+     * Constructs a new UnsupportedPackageTypeException.
+     *
+     * @param message
+     */
+    public UnsupportedPackageTypeException(String message) {
+        super(message);
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ValidatingXMLInputFactory.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ValidatingXMLInputFactory.java
new file mode 100644
index 0000000000..0ad8259287
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ValidatingXMLInputFactory.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.contribution.processor;
+
+import javax.xml.stream.XMLInputFactory;
+import javax.xml.stream.XMLStreamReader;
+
+import org.apache.tuscany.sca.monitor.Monitor;
+
+/**
+ * Base marker class for validating XML input factories.
+ *
+ * @version $Rev$ $Date$
+ */
+public abstract class ValidatingXMLInputFactory extends XMLInputFactory {
+    
+    /**
+     * Allows the monitor to be set in lieu of the context being passed
+     * into the create methods. The base definitions of the create methods 
+     * don't allow for this. 
+     * 
+     * @param reader the XMLStreamReader instance
+     * @param monitor the current monitor object
+     * 
+     * @tuscany.spi.extension.asclient
+     */
+    public static void setMonitor(XMLStreamReader reader, Monitor monitor) {
+        if (reader instanceof ValidatingXMLStreamReader) {
+            ((ValidatingXMLStreamReader)reader).setMonitor(monitor);
+        }
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ValidatingXMLStreamReader.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ValidatingXMLStreamReader.java
new file mode 100644
index 0000000000..6de25d4eeb
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ValidatingXMLStreamReader.java
@@ -0,0 +1,409 @@
+/*
+ * 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.contribution.processor;
+
+import java.util.logging.Logger;
+
+import javax.xml.namespace.NamespaceContext;
+import javax.xml.namespace.QName;
+import javax.xml.stream.Location;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+import javax.xml.stream.util.StreamReaderDelegate;
+import javax.xml.validation.Schema;
+import javax.xml.validation.ValidatorHandler;
+
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.monitor.Problem;
+import org.apache.tuscany.sca.monitor.Problem.Severity;
+import org.xml.sax.Attributes;
+import org.xml.sax.ErrorHandler;
+import org.xml.sax.Locator;
+import org.xml.sax.SAXException;
+import org.xml.sax.SAXParseException;
+import org.xml.sax.helpers.AttributesImpl;
+
+/**
+ * 
+ * A validating XMLStreamReader that reports XMLSchema validation errors.
+ *
+ * @version $Rev$ $Date$
+ */
+class ValidatingXMLStreamReader extends StreamReaderDelegate implements XMLStreamReader {
+
+    private static final Logger logger = Logger.getLogger(ValidatingXMLStreamReader.class.getName());
+    
+    private ValidatorHandler handler;
+    private Schema schema;
+    private Monitor monitor;
+    
+    /**
+     * Constructs a new ValidatingXMLStreamReader.
+     * 
+     * @param reader
+     * @param schema
+     * @throws XMLStreamException
+     */
+    ValidatingXMLStreamReader(XMLStreamReader reader, Schema schema, Monitor monitor) throws XMLStreamException {
+        super(reader);
+        this.monitor = monitor;
+        this.schema = schema;
+    }
+    
+    void setMonitor(Monitor monitor) {
+        this.monitor = monitor;
+    }
+
+    private synchronized ValidatorHandler getHandler() throws XMLStreamException {
+        if (schema == null || handler!=null) {
+            return handler;
+        }
+        handler = schema.newValidatorHandler();
+        handler.setDocumentLocator(new LocatorAdapter());
+        try {
+            handler.setFeature("http://xml.org/sax/features/namespace-prefixes", true);
+        } catch (SAXException e) {
+        	XMLStreamException xse = new XMLStreamException(e);
+        	error("XMLStreamException", handler, xse);
+            throw xse;
+        }
+        
+        // These validation errors are just warnings for us as we want to support
+        // running from an XML document with XSD validation errors, as long as we can
+        // get the metadata we need from the document
+        handler.setErrorHandler(new ErrorHandler() {        	
+            private String getMessage(SAXParseException e) {
+                return "XMLSchema validation problem in: " + getArtifactName( e.getSystemId() ) + ", line: " + e.getLineNumber() + ", column: " + e.getColumnNumber() + "\n" + e.getMessage();
+            }
+            
+            public void error(SAXParseException exception) throws SAXException {            	
+            	if (ValidatingXMLStreamReader.this.monitor == null)
+            		logger.warning(getMessage(exception));
+            	else            		
+            		ValidatingXMLStreamReader.this.error("SchemaError", ValidatingXMLStreamReader.this.getClass(), getArtifactName( exception.getSystemId() ), 
+                   		exception.getLineNumber(), exception.getColumnNumber(), exception.getMessage());                              
+            }
+            
+            public void fatalError(SAXParseException exception) throws SAXException {            	
+            	if (ValidatingXMLStreamReader.this.monitor == null)
+            		logger.warning(getMessage(exception));
+            	else
+            		ValidatingXMLStreamReader.this.error("SchemaFatalError", ValidatingXMLStreamReader.this.getClass(), getArtifactName( exception.getSystemId() ), 
+                       	exception.getLineNumber(), exception.getColumnNumber(), exception.getMessage());               
+            }
+            
+            public void warning(SAXParseException exception) throws SAXException {
+            	if (ValidatingXMLStreamReader.this.monitor == null)
+            		logger.warning(getMessage(exception));
+            	else
+            		ValidatingXMLStreamReader.this.warning("SchemaWarning", ValidatingXMLStreamReader.this.getClass(), getArtifactName( exception.getSystemId() ), 
+                       	exception.getLineNumber(), exception.getColumnNumber(), exception.getMessage());                
+            }
+            
+            private String getArtifactName( String input ) {
+            	String artifactName = null;
+            	if( ValidatingXMLStreamReader.this.monitor != null ) {
+            		artifactName = ValidatingXMLStreamReader.this.monitor.getArtifactName();
+            	}
+            	if (artifactName == null){
+            	    artifactName = input;
+            	}
+            	return artifactName;
+            }
+        });
+        return handler;
+    }
+    
+    /**
+     * Report a warning.
+     * 
+     * @param problems
+     * @param message
+     * @param model
+     */
+    private void warning(String message, Object model, Object... messageParameters) {
+        if (monitor != null) {
+            Problem problem = monitor.createProblem(this.getClass().getName(), "contribution-validation-messages", Severity.WARNING, model, message, (Object[])messageParameters);
+            monitor.problem(problem);
+    	}
+    }
+    
+    /**
+     * Report a error.
+     * 
+     * @param problems
+     * @param message
+     * @param model
+     */
+    private void error(String message, Object model, Object... messageParameters) {
+        if (monitor != null) {
+            Problem problem = monitor.createProblem(this.getClass().getName(), "contribution-validation-messages", Severity.ERROR, model, message, (Object[])messageParameters);
+            monitor.problem(problem);
+        }
+    }
+
+    @Override
+    public int next() throws XMLStreamException {
+        if (getHandler() == null) {
+            return super.next();
+        }
+
+        int event = super.getEventType();
+        try {
+            if (event == START_DOCUMENT) {
+                // We need to trigger the startDocument()
+                handler.startDocument();
+            }
+            event = super.next();
+            validate(event);
+        } catch (SAXException e) {
+            XMLStreamException xse = new XMLStreamException(e.getMessage(), e);
+            error("XMLStreamException", handler, xse);
+            throw xse;
+        }
+        return event;
+    }
+
+    private void validate(int event) throws SAXException {
+        switch (event) {
+            case START_DOCUMENT:
+                handler.startDocument();
+                break;
+            case START_ELEMENT:
+                handleStartElement();
+                break;
+            case PROCESSING_INSTRUCTION:
+                handler.processingInstruction(super.getPITarget(), super.getPIData());
+                break;
+            case CHARACTERS:
+            case CDATA:
+            case SPACE:
+            case ENTITY_REFERENCE:
+                handler.characters(super.getTextCharacters(), super.getTextStart(), super.getTextLength());
+                break;
+            case END_ELEMENT:
+                handleEndElement();
+                break;
+            case END_DOCUMENT:
+                handler.endDocument();
+                break;
+        }
+    }
+    
+    @Override
+    public int nextTag() throws XMLStreamException {
+        if (getHandler() == null) {
+            return super.nextTag();
+        }
+        while (true) {
+            int event = super.getEventType();
+            try {
+                if (event == START_DOCUMENT) {
+                    // We need to trigger the startDocument()
+                    handler.startDocument();
+                }
+                event = super.next();
+                validate(event);
+            } catch (SAXException e) {
+                XMLStreamException xse = new XMLStreamException(e);
+                error("XMLStreamException", handler, xse);
+                throw xse;
+            }
+
+            if ((event == CHARACTERS && isWhiteSpace()) // skip whitespace
+                || (event == CDATA && isWhiteSpace())
+                // skip whitespace
+                || event == SPACE
+                || event == PROCESSING_INSTRUCTION
+                || event == COMMENT) {
+                continue;
+            }
+            if (event != START_ELEMENT && event != END_ELEMENT) {
+                throw new XMLStreamException("expected start or end tag", getLocation());
+            }
+            return event;
+        }
+    }
+    
+    @Override
+    public String getElementText() throws XMLStreamException {
+        if (getHandler() == null) {
+            return super.getElementText();
+        }
+
+        if (getEventType() != START_ELEMENT) {
+            return super.getElementText();
+        }
+        StringBuffer text = new StringBuffer();
+
+        for (;;) {
+            int event = next();
+            switch (event) {
+                case END_ELEMENT:
+                    return text.toString();
+                    
+                case COMMENT:
+                case PROCESSING_INSTRUCTION:
+                    continue;
+                    
+                case CHARACTERS:
+                case CDATA:
+                case SPACE:
+                case ENTITY_REFERENCE:
+                    text.append(getText());
+                    break;
+                    
+                default:
+                    break;
+            }
+        }
+    }
+    
+    @Override
+    public NamespaceContext getNamespaceContext(){
+    	return super.getNamespaceContext();
+    }
+    
+    /**
+     * Handle a start element event.
+     * 
+     * @throws SAXException
+     */
+    private void handleStartElement() throws SAXException {
+
+        // send startPrefixMapping events immediately before startElement event
+        int nsCount = super.getNamespaceCount();
+        for (int i = 0; i < nsCount; i++) {
+            String prefix = super.getNamespacePrefix(i);
+            if (prefix == null) { // true for default namespace
+                prefix = "";
+            }
+            handler.startPrefixMapping(prefix, super.getNamespaceURI(i));
+        }
+
+        // fire startElement
+        QName qname = super.getName();
+        String prefix = qname.getPrefix();
+        String rawname;
+        if (prefix == null || prefix.length() == 0) {
+            rawname = qname.getLocalPart();
+        } else {
+            rawname = prefix + ':' + qname.getLocalPart();
+        }
+        Attributes attrs = getAttributes();
+        handler.startElement(qname.getNamespaceURI(), qname.getLocalPart(), rawname, attrs);
+    }
+
+    /**
+     * Handle an endElement event.
+     * 
+     * @throws SAXException
+     */
+    private void handleEndElement() throws SAXException {
+
+        // fire endElement
+        QName qname = super.getName();
+        handler.endElement(qname.getNamespaceURI(), qname.getLocalPart(), qname.toString());
+
+        // send endPrefixMapping events immediately after endElement event
+        // we send them in the opposite order to that returned but this is not
+        // actually required by SAX
+        int nsCount = super.getNamespaceCount();
+        for (int i = nsCount - 1; i >= 0; i--) {
+            String prefix = super.getNamespacePrefix(i);
+            if (prefix == null) { // true for default namespace
+                prefix = "";
+            }
+            handler.endPrefixMapping(prefix);
+        }
+    }
+
+    /**
+     * Get the attributes associated with the current START_ELEMENT event.
+     * 
+     * @return the StAX attributes converted to org.xml.sax.Attributes
+     */
+    private Attributes getAttributes() {
+        AttributesImpl attrs = new AttributesImpl();
+
+        // add namespace declarations
+        for (int i = 0; i < super.getNamespaceCount(); i++) {
+            String prefix = super.getNamespacePrefix(i);
+            String uri = super.getNamespaceURI(i);
+            if (prefix == null) {
+                attrs.addAttribute("", "", "xmlns", "CDATA", uri);
+            } else {
+                attrs.addAttribute("", "", "xmlns:" + prefix, "CDATA", uri);
+            }
+        }
+
+        // Regular attributes
+        for (int i = 0; i < super.getAttributeCount(); i++) {
+            String uri = super.getAttributeNamespace(i);
+            if (uri == null) {
+                uri = "";
+            }
+            String localName = super.getAttributeLocalName(i);
+            String prefix = super.getAttributePrefix(i);
+            String qname;
+            if (prefix == null || prefix.length() == 0) {
+                qname = localName;
+            } else {
+                qname = prefix + ':' + localName;
+            }
+            String type = super.getAttributeType(i);
+            String value = super.getAttributeValue(i);
+
+            attrs.addAttribute(uri, localName, qname, type, value);
+        }
+
+        return attrs;
+    }
+
+    /**
+     * Adapter for mapping Locator information.
+     */
+    private final class LocatorAdapter implements Locator {
+
+        private LocatorAdapter() {
+        }
+
+        public int getColumnNumber() {
+            Location location = getLocation();
+            return location == null ? 0 : location.getColumnNumber();
+        }
+
+        public int getLineNumber() {
+            Location location = getLocation();
+            return location == null ? 0 : location.getLineNumber();
+        }
+
+        public String getPublicId() {
+            Location location = getLocation();
+            return location == null ? "" : location.getPublicId();
+        }
+
+        public String getSystemId() {
+            Location location = getLocation();
+            return location == null ? "" : location.getSystemId();
+        }
+    }
+    
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ValidationSchemaExtensionPoint.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ValidationSchemaExtensionPoint.java
new file mode 100644
index 0000000000..67ec55b72e
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ValidationSchemaExtensionPoint.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.contribution.processor;
+
+import java.util.List;
+
+
+/**
+ * An extension point for XML schemas used for validation.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface ValidationSchemaExtensionPoint {
+    /**
+     * Set the flag to control if schema validation should be enabled
+     * @param enabled
+     */
+    void setEnabled(boolean enabled);
+
+    /**
+     * Test the schema validation is enabled
+     * @return
+     */
+    boolean isEnabled();
+
+    /**
+     * Add a schema.
+     *
+     * @param uri the URI of the schema
+     */
+    void addSchema(String uri);
+
+    /**
+     * Remove a schema.
+     *
+     * @param uri the URI of the schema
+     */
+    void removeSchema(String uri);
+
+    /**
+     * Returns the list of schemas registered in the extension point.
+     * @return the list of schemas
+     */
+    List<String> getSchemas();
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/impl/ContributionContentProcessor.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/impl/ContributionContentProcessor.java
new file mode 100644
index 0000000000..6e6346fe47
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/impl/ContributionContentProcessor.java
@@ -0,0 +1,329 @@
+/*
+ * 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.contribution.processor.impl;
+
+import java.io.File;
+import java.net.MalformedURLException;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.util.List;
+import java.util.ListIterator;
+
+import org.apache.tuscany.sca.assembly.Composite;
+import org.apache.tuscany.sca.contribution.Artifact;
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.ContributionFactory;
+import org.apache.tuscany.sca.contribution.ContributionMetadata;
+import org.apache.tuscany.sca.contribution.DefaultExport;
+import org.apache.tuscany.sca.contribution.DefaultImport;
+import org.apache.tuscany.sca.contribution.Export;
+import org.apache.tuscany.sca.contribution.Import;
+import org.apache.tuscany.sca.contribution.java.JavaExport;
+import org.apache.tuscany.sca.contribution.processor.ContributionReadException;
+import org.apache.tuscany.sca.contribution.processor.ContributionResolveException;
+import org.apache.tuscany.sca.contribution.processor.ExtendedURLArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.ExtensibleURLArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.URLArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.URLArtifactProcessorExtensionPoint;
+import org.apache.tuscany.sca.contribution.resolver.DefaultModelResolver;
+import org.apache.tuscany.sca.contribution.resolver.ExtensibleModelResolver;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolverExtensionPoint;
+import org.apache.tuscany.sca.contribution.scanner.ContributionScanner;
+import org.apache.tuscany.sca.contribution.scanner.ContributionScannerExtensionPoint;
+import org.apache.tuscany.sca.contribution.scanner.impl.DirectoryContributionScanner;
+import org.apache.tuscany.sca.contribution.scanner.impl.JarContributionScanner;
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+import org.apache.tuscany.sca.monitor.Monitor;
+
+/**
+ * URLArtifactProcessor that handles contribution files and the artifacts they contain
+ * and returns a contribution model.
+ *
+ * @version $Rev$ $Date$
+ */
+public class ContributionContentProcessor implements ExtendedURLArtifactProcessor<Contribution>{
+    private ContributionFactory contributionFactory;
+    private ModelResolverExtensionPoint modelResolvers;
+    private FactoryExtensionPoint modelFactories;
+    private URLArtifactProcessor<Object> artifactProcessor;
+    private StAXArtifactProcessor<Object> extensionProcessor;
+    private ContributionScannerExtensionPoint scanners;
+    // Marks pre-resolve phase completed
+    private boolean preResolved = false;
+
+    public ContributionContentProcessor(ExtensionPointRegistry extensionPoints, StAXArtifactProcessor<Object> extensionProcessor) {
+        this.modelFactories = extensionPoints.getExtensionPoint(FactoryExtensionPoint.class);
+        this.modelResolvers = extensionPoints.getExtensionPoint(ModelResolverExtensionPoint.class);
+        URLArtifactProcessorExtensionPoint artifactProcessors = extensionPoints.getExtensionPoint(URLArtifactProcessorExtensionPoint.class);
+        this.artifactProcessor = new ExtensibleURLArtifactProcessor(artifactProcessors);
+        this.extensionProcessor = extensionProcessor;
+        this.contributionFactory = modelFactories.getFactory(ContributionFactory.class);
+        this.scanners = extensionPoints.getExtensionPoint(ContributionScannerExtensionPoint.class);
+    }
+
+    public String getArtifactType() {
+        return ".contribution/content";
+    }
+
+    public Class<Contribution> getModelType() {
+        return Contribution.class;
+    }
+
+    private File toFile(URL url) {
+        if("file".equalsIgnoreCase(url.getProtocol())) {
+            try {
+                return new File(url.toURI());
+            } catch(URISyntaxException e) {
+                return new File(url.getPath());
+            } catch(IllegalArgumentException e) {
+                // Hack for file:./a.txt or file:../a/c.wsdl
+                return new File(url.getPath());
+            }
+        }
+        return null;
+    }
+
+    public Contribution read(URL parentURL, URI contributionURI, URL contributionURL, ProcessorContext context) throws ContributionReadException {
+
+        
+        // Create contribution model
+        Contribution contribution = contributionFactory.createContribution();
+        contribution.setURI(contributionURI.toString());
+        contribution.setLocation(contributionURL.toString());
+        ModelResolver modelResolver = new ExtensibleModelResolver(contribution, modelResolvers, modelFactories);
+        contribution.setModelResolver(modelResolver);
+        contribution.setUnresolved(true);
+        
+        Monitor monitor = context.getMonitor();
+        monitor.pushContext("Contribution: " + contribution.getURI());
+
+        Contribution old = context.setContribution(contribution);
+        try {
+            // Create a contribution scanner
+            ContributionScanner scanner = scanners.getContributionScanner(contributionURL.getProtocol());
+            if (scanner == null) {
+                File file = toFile(contributionURL);
+                if (file != null && file.isDirectory()) {
+                    scanner = new DirectoryContributionScanner(contributionFactory);
+                } else {
+                    scanner = new JarContributionScanner(contributionFactory);
+                }
+            }
+    
+            // Scan the contribution and list the artifacts contained in it
+            boolean contributionMetadata = false;
+            List<Artifact> artifacts = scanner.scan(contribution);
+            for (Artifact artifact : artifacts) {
+                // Add the deployed artifact model to the contribution
+                modelResolver.addModel(artifact, context);
+                
+                monitor.pushContext("Artifact: " + artifact.getURI());
+    
+                Artifact oldArtifact = context.setArtifact(artifact);
+                try {
+                    // Read each artifact
+                    URL artifactLocationURL = null;
+                    try {
+                        artifactLocationURL = new URL(artifact.getLocation());
+                    } catch(MalformedURLException e) {
+                        //ignore
+                    }
+                    
+                    Object model = artifactProcessor.read(contributionURL, URI.create(artifact.getURI()), artifactLocationURL, context);
+                    if (model != null) {
+                        artifact.setModel(model);
+        
+                        // Add the loaded model to the model resolver
+                        modelResolver.addModel(model, context);
+        
+                        // Merge contribution metadata into the contribution model
+                        if (model instanceof ContributionMetadata) {
+                            contributionMetadata = true;
+                            ContributionMetadata c = (ContributionMetadata)model;
+                            contribution.getImports().addAll(c.getImports());
+                            contribution.getExports().addAll(c.getExports());
+                            contribution.getDeployables().addAll(c.getDeployables());
+                            contribution.getExtensions().addAll(c.getExtensions());
+                            contribution.getAttributeExtensions().addAll(c.getAttributeExtensions());
+                        }
+                    }
+                } finally {
+                    monitor.popContext();
+                    context.setArtifact(oldArtifact);
+                }                    
+            }
+            
+            List<Artifact> contributionArtifacts = contribution.getArtifacts();
+            contributionArtifacts.addAll(artifacts);
+    
+            // If no sca-contribution.xml file was provided then just consider
+            // all composites in the contribution as deployables
+            if (!contributionMetadata) {
+                for (Artifact artifact: artifacts) {
+                    if (artifact.getModel() instanceof Composite) {
+                        contribution.getDeployables().add((Composite)artifact.getModel());
+                    }
+                }
+    
+                // Add default contribution import and export
+                DefaultImport defaultImport = contributionFactory.createDefaultImport();
+                defaultImport.setModelResolver(new DefaultModelResolver());
+                contribution.getImports().add(defaultImport);
+                DefaultExport defaultExport = contributionFactory.createDefaultExport();
+                contribution.getExports().add(defaultExport);
+            } else {
+                if (contribution.getDeployables().size() > 0) {
+                    // Update the deployable Composite objects with the correct Composite object for the artifact
+                    for (Artifact a : contribution.getArtifacts()) {
+                        if (a.getModel() instanceof Composite) {
+                            for (ListIterator<Composite> lit = contribution.getDeployables().listIterator(); lit.hasNext();) {
+                                if (lit.next().getName().equals(((Composite)a.getModel()).getName())) {
+                                    lit.set((Composite)a.getModel());
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        } finally {
+            monitor.popContext();
+            context.setContribution(old);
+        }
+        
+        return contribution;
+    }
+
+    /**
+     * A pre-resolution step, which is required for Contributions to handle the resolution of imports and exports so that
+     * at resolve time, imports can be followed to exports and anything exported that is required can be resolved on demand
+     * without the need to have already resolved the whole of the Contribution containing the export
+     * @param contribution - the Contribution
+     * @param resolver - the Resolver to use
+     * @throws ContributionResolveException
+     */
+    public void preResolve(Contribution contribution, ModelResolver resolver, ProcessorContext context) throws ContributionResolveException {
+        // Resolve the contribution model itself
+        ModelResolver contributionResolver = contribution.getModelResolver();
+        contribution.setUnresolved(false);
+        contributionResolver.addModel(contribution, context);
+
+        // Resolve Exports
+        resolveExports(contribution, contributionResolver, context);
+        // Resolve Imports
+        resolveImports(contribution, contributionResolver, context);
+
+        preResolved = true;
+    } // end method preResolve
+
+    public void resolve(Contribution contribution, ModelResolver resolver, ProcessorContext context) throws ContributionResolveException {
+
+        Monitor monitor = context.getMonitor();
+        Contribution old = context.setContribution(contribution);
+    	try {
+    		monitor.pushContext("Contribution: " + contribution.getURI());
+    		
+	    	if( !preResolved ) preResolve( contribution, resolver, context);
+	    	ModelResolver contributionResolver = contribution.getModelResolver();
+	
+	        // Validate Java Exports: [JCI100007] A Java package that is specified on an export 
+	    	// element MUST be contained within the contribution containing the export element.
+	    	for (Export export: contribution.getExports()) {
+	    		if (export instanceof JavaExport) {
+	    			boolean available = false;
+	    			String packageName = ((JavaExport)export).getPackage();
+		    		for (Artifact artifact : contribution.getArtifacts()) {
+		    			if (packageName.equals(artifact.getURI().replace("/", ".")))
+		    					available = true;
+			    	}
+		    		if (! available)
+		    			throw new ContributionResolveException("[JCI100007] A Java package "+ packageName +" that is specified on an export " +
+		    					"element MUST be contained within the contribution containing the export element.");
+	    		}
+	    	}	    	
+	    	
+	    	// Resolve all artifact models
+	        for (Artifact artifact : contribution.getArtifacts()) {
+	            Object model = artifact.getModel();
+	            if (model != null) {
+	                Artifact oldArtifact = context.setArtifact(artifact);
+	                try {
+	                   artifactProcessor.resolve(model, contributionResolver, context);
+	                } catch (Throwable e) {
+	                    throw new ContributionResolveException(e);
+	                } finally {
+	                    context.setArtifact(oldArtifact);
+	                }
+	            }
+	        }
+	
+            // Resolve deployable composites
+            List<Composite> deployables = contribution.getDeployables();
+            Artifact oldArtifact = context.setArtifact(contribution);
+            try {
+                for (int i = 0, n = deployables.size(); i < n; i++) {
+                    Composite deployable = deployables.get(i);
+                    Composite resolved =
+                        (Composite)contributionResolver.resolveModel(Composite.class, deployable, context);
+                    if (resolved != deployable) {
+                        deployables.set(i, resolved);
+                    }
+                } // end for
+            } finally {
+                context.setArtifact(oldArtifact);
+            }
+    	} finally {
+    		monitor.popContext();
+    		context.setContribution(old);
+    	} // end try
+    } // end method resolve
+
+    /**
+     * Resolves the Exports of the contribution
+     * @param contribution
+     * @param resolver
+     */
+    private void resolveExports(Contribution contribution, ModelResolver resolver, ProcessorContext context) throws ContributionResolveException {
+    	for (Export export: contribution.getExports()) {
+            if (export instanceof DefaultExport) {
+                // Initialize the default export's resolver
+                export.setModelResolver(resolver);
+            } else {
+                extensionProcessor.resolve(export, resolver, context);
+            } // end if
+        } // end for
+
+    } // end method resolveExports
+
+    /**
+     * Resolves the Imports of the contribution
+     * @param contribution
+     * @param resolver
+     */
+    private void resolveImports(Contribution contribution, ModelResolver resolver, ProcessorContext context) throws ContributionResolveException {
+        for (Import import_: contribution.getImports()) {
+            extensionProcessor.resolve(import_, resolver, context);
+        } // end for
+    } // end method resolveImports
+
+} // end class ContributionContentProcessor
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/xml/AnyAttributeProcessor.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/xml/AnyAttributeProcessor.java
new file mode 100644
index 0000000000..f589c6b911
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/xml/AnyAttributeProcessor.java
@@ -0,0 +1,79 @@
+/*
+ * 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.contribution.processor.xml;
+
+import javax.xml.namespace.QName;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+import javax.xml.stream.XMLStreamWriter;
+
+import org.apache.tuscany.sca.assembly.AssemblyFactory;
+import org.apache.tuscany.sca.assembly.Extension;
+import org.apache.tuscany.sca.contribution.processor.BaseStAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.ContributionReadException;
+import org.apache.tuscany.sca.contribution.processor.ContributionResolveException;
+import org.apache.tuscany.sca.contribution.processor.ContributionWriteException;
+import org.apache.tuscany.sca.contribution.processor.ExtensibleStAXAttributeProcessor;
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+import org.apache.tuscany.sca.contribution.processor.StAXAttributeProcessor;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+
+/**
+ * A Policy Processor used for testing.
+ *
+ * @version $Rev$ $Date$
+ */
+public class AnyAttributeProcessor extends BaseStAXArtifactProcessor implements StAXAttributeProcessor<Extension> {
+    
+    private AssemblyFactory assemblyFactory;
+
+    public AnyAttributeProcessor(FactoryExtensionPoint modelFactories) {
+        this.assemblyFactory = modelFactories.getFactory(AssemblyFactory.class);
+    }
+	
+    public QName getArtifactType() {
+        return ExtensibleStAXAttributeProcessor.ANY_ATTRIBUTE;
+    }
+
+    public Class<Extension> getModelType() {
+        return Extension.class;
+    }
+
+    public Extension read(QName attributeName, XMLStreamReader reader, ProcessorContext context) throws ContributionReadException, XMLStreamException {
+        String attributeValue = reader.getAttributeValue(attributeName.getNamespaceURI(), attributeName.getLocalPart());
+        Extension ext = assemblyFactory.createExtension();
+        ext.setQName(attributeName);
+        ext.setAttribute(true);
+        ext.setValue(attributeValue);
+        return ext;
+    }
+
+    public void write(Extension attributeExtension, XMLStreamWriter writer, ProcessorContext context) throws ContributionWriteException, XMLStreamException {
+    	writer.writeAttribute(attributeExtension.getQName().getPrefix(), 
+    	                      attributeExtension.getQName().getNamespaceURI(), 
+    	                      attributeExtension.getQName().getLocalPart(), 
+    	                      attributeExtension.getValue().toString());  //for extended attributes, we can assume values 
+    	                                                                  // are just the string representation fo the attribute
+    } 
+
+    public void resolve(Extension model, ModelResolver modelResolver, ProcessorContext context) throws ContributionResolveException {
+    	
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/xml/AnyElementProcessor.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/xml/AnyElementProcessor.java
new file mode 100644
index 0000000000..db4feeec48
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/xml/AnyElementProcessor.java
@@ -0,0 +1,96 @@
+/*
+ * 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.contribution.processor.xml;
+
+import java.io.StringReader;
+
+import javax.xml.namespace.QName;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+import javax.xml.stream.XMLStreamWriter;
+
+import org.apache.tuscany.sca.assembly.AssemblyFactory;
+import org.apache.tuscany.sca.assembly.Extension;
+import org.apache.tuscany.sca.common.xml.stax.StAXHelper;
+import org.apache.tuscany.sca.contribution.processor.ContributionReadException;
+import org.apache.tuscany.sca.contribution.processor.ContributionResolveException;
+import org.apache.tuscany.sca.contribution.processor.ExtensibleStAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+
+public class AnyElementProcessor implements StAXArtifactProcessor<Extension> {
+    private AssemblyFactory assemblyFactory;
+    private StAXHelper helper;
+    
+    public AnyElementProcessor(ExtensionPointRegistry extensionPoints, StAXArtifactProcessor<Object> extensionProcessor) {
+        FactoryExtensionPoint modelFactories = extensionPoints.getExtensionPoint(FactoryExtensionPoint.class);
+        assemblyFactory = modelFactories.getFactory(AssemblyFactory.class);
+        this.helper = StAXHelper.getInstance(extensionPoints);
+    }
+
+    public QName getArtifactType() {
+        return ExtensibleStAXArtifactProcessor.ANY_ELEMENT;
+    }
+
+    public Class<Extension> getModelType() {
+        return Extension.class;
+    }
+
+    /**
+     * Reads the contetns of the unknown elements and generates a custom
+     * implementation of XMLStreamReader i.e. XMLEventsStreamReader
+     * 
+     * @param reader
+     * @return
+     * @throws XMLStreamException
+     */
+    public Extension read(XMLStreamReader reader, ProcessorContext context) throws ContributionReadException, XMLStreamException {
+        QName name = reader.getName();
+        String xml = helper.saveAsString(reader);
+        Extension ext = assemblyFactory.createExtension();
+        ext.setQName(name);
+        ext.setValue(xml);
+        
+        return ext;
+    }
+
+    /**
+     * Writes unknown portions back to the writer
+     * 
+     * @param model
+     * @param writer
+     */
+    public void write(Extension model, XMLStreamWriter writer, ProcessorContext context) throws XMLStreamException {
+        Object value = model.getValue();
+        if (!(value instanceof String)) {
+            return;
+        }
+        String xml = (String) value;
+        XMLStreamReader reader = helper.createXMLStreamReader(new StringReader(xml));
+        // Position the reader to the root element
+        reader.nextTag();
+        helper.save(reader, writer);
+    }
+
+    public void resolve(Extension model, ModelResolver resolver, ProcessorContext context) throws ContributionResolveException {
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/ClassReference.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/ClassReference.java
new file mode 100644
index 0000000000..7d8f2ef1c8
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/ClassReference.java
@@ -0,0 +1,129 @@
+/*
+ * 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.contribution.resolver;
+
+import java.lang.ref.WeakReference;
+
+import org.apache.tuscany.sca.assembly.Base;
+import org.apache.tuscany.sca.contribution.Contribution;
+
+/**
+ * A weak reference to a class, which should be used to register classes
+ * with an ArtifactResolver and resolve these classes later.
+ * 
+ * FIXME The core contribution model should not have dependencies on classes
+ * and ClassLoaders. This should move to the Java import support module.
+ *
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.asclient
+ */
+public class ClassReference implements Base {
+    
+    private WeakReference<Class<?>> clazz;
+    private String className;
+    private Contribution contributionContainingClass;
+
+    /**
+     * Constructs a new ClassReference.
+     * 
+     * @param clazz The class reference
+     */
+    public ClassReference(Class<?> clazz) {
+        this.clazz = new WeakReference<Class<?>>(clazz);
+        this.className = clazz.getName();
+    }
+    
+    /**
+     * Constructs a new ClassReference.
+     * 
+     * @param className The class name
+     */
+    public ClassReference(String className) {
+        this.className = className;
+    }
+    
+    /**
+     * Get the referenced class.
+     * 
+     * @return The referenced class
+     */
+    public Class<?> getJavaClass() {
+        if (clazz != null) {
+            return clazz.get();
+        } else {
+            return null;
+        }
+    }
+    
+    /**
+     * Get the referenced class name.
+     * 
+     * @return The class name
+     */
+    public String getClassName() {
+        return className;
+    }
+    
+    public boolean isUnresolved() {
+        return clazz == null;
+    }
+    
+    public void setUnresolved(boolean unresolved) {
+        throw new IllegalStateException();
+    }
+
+    @Override
+    public int hashCode() {
+        return className.hashCode();
+    }
+    
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        } else {
+            if (obj instanceof ClassReference) {
+                return className.equals(((ClassReference)obj).className);
+            } else {
+                return false;
+            }
+        }
+    }
+    
+    /**
+     * A Java class may reference a WSDL file via a JAXWS annotation. We need to resolve
+     * the WSDL file location in the context of the same contribution that holds the 
+     * Java file. In order to do this we need to pass back the actual contribution that
+     * was used to resolve a Java class. It's possible that multiple contributions hold
+     * the same class so just scanning the artifacts in all the contribution is not good 
+     * enough
+     * 
+     * @return
+     */
+    public Contribution getContributionContainingClass() {
+        return contributionContainingClass;
+    }
+    
+    public void setContributionContainingClass(
+            Contribution contributionContainingClass) {
+        this.contributionContainingClass = contributionContainingClass;
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/DefaultDelegatingModelResolver.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/DefaultDelegatingModelResolver.java
new file mode 100644
index 0000000000..e17dd176a6
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/DefaultDelegatingModelResolver.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.contribution.resolver;
+
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.Base;
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+
+/**
+ * A model resolver implementation that delegates to a list of model resolvers.
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefaultDelegatingModelResolver implements ModelResolver {
+    
+    private List<ModelResolver> resolvers;
+    
+    public DefaultDelegatingModelResolver(List<ModelResolver> resolvers) {
+        this.resolvers = resolvers;
+    }
+
+    public void addModel(Object resolved, ProcessorContext context) {
+        throw new IllegalStateException();
+    }
+
+    public Object removeModel(Object resolved, ProcessorContext context) {
+        throw new IllegalStateException();
+    }
+
+    public <T> T resolveModel(Class<T> modelClass, T unresolved, ProcessorContext context) {
+        
+        //TODO optimize and cache results of the resolution later
+        
+        // Go over all resolvers
+        for (ModelResolver resolver: resolvers) {
+            
+            Object resolved = resolver.resolveModel(modelClass, unresolved, context);
+            
+            // Return the resolved model object
+            if (resolved instanceof Base) {
+                if (!((Base)resolved).isUnresolved()) {
+                    return modelClass.cast(resolved);
+                }
+            }
+        }
+
+        // Model object was not resolved
+        return unresolved;
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/DefaultImportAllModelResolver.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/DefaultImportAllModelResolver.java
new file mode 100644
index 0000000000..7745253bba
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/DefaultImportAllModelResolver.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.contribution.resolver;
+
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.Base;
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.Export;
+import org.apache.tuscany.sca.contribution.Import;
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+
+/**
+ * A model resolver implementation that considers Exports in a list of contributions.
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefaultImportAllModelResolver implements ModelResolver {
+    
+    private Import import_;
+    private List<Contribution> contributions;
+    
+    public DefaultImportAllModelResolver(Import import_, List<Contribution> contributions) {
+        this.import_ = import_;
+        this.contributions = contributions;
+    }
+
+    public void addModel(Object resolved, ProcessorContext context) {
+        throw new IllegalStateException();
+    }
+
+    public Object removeModel(Object resolved, ProcessorContext context) {
+        throw new IllegalStateException();
+    }
+
+    public <T> T resolveModel(Class<T> modelClass, T unresolved, ProcessorContext context) {
+        
+        //TODO optimize and cache results of the resolution later
+        
+        // Go over all available contributions
+        for (Contribution contribution : contributions) {
+            
+            // Go over all exports in the contribution
+            for (Export export : contribution.getExports()) {
+                
+                    // If the export matches the export, try to resolve the model object
+                    if (import_.match(export)) {
+                        Object resolved = export.getModelResolver().resolveModel(modelClass, unresolved, context);
+                        
+                        // Return the resolved model object
+                        if (resolved instanceof Base) {
+                            if (!((Base)resolved).isUnresolved()) {
+                                return modelClass.cast(resolved);
+                            }
+                        }
+                    }
+            }
+        }
+
+        // Model object was not resolved
+        return unresolved;
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/DefaultImportModelResolver.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/DefaultImportModelResolver.java
new file mode 100644
index 0000000000..8a11cb42f8
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/DefaultImportModelResolver.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.contribution.resolver;
+
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.Base;
+import org.apache.tuscany.sca.contribution.Export;
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+
+/**
+ * A model resolver implementation that delegates to a list of exports.
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefaultImportModelResolver implements ModelResolver {
+    
+    private List<Export> exports;
+    
+    public DefaultImportModelResolver(List<Export> exports) {
+        this.exports = exports;
+    }
+
+    public void addModel(Object resolved, ProcessorContext context) {
+        throw new IllegalStateException();
+    }
+
+    public Object removeModel(Object resolved, ProcessorContext context) {
+        throw new IllegalStateException();
+    }
+
+    public <T> T resolveModel(Class<T> modelClass, T unresolved, ProcessorContext context) {
+        
+        //TODO optimize and cache results of the resolution later
+        
+        // Go over all exports
+        for (Export export: exports) {
+            
+            Object resolved = export.getModelResolver().resolveModel(modelClass, unresolved, context);
+            
+            // Return the resolved model object
+            if (resolved instanceof Base) {
+                if (!((Base)resolved).isUnresolved()) {
+                    return modelClass.cast(resolved);
+                }
+            }
+        }
+
+        // Model object was not resolved
+        return unresolved;
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/DefaultModelResolver.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/DefaultModelResolver.java
new file mode 100644
index 0000000000..94b2fb0058
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/DefaultModelResolver.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.contribution.resolver;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.DefaultImport;
+import org.apache.tuscany.sca.contribution.Import;
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+
+/**
+ * A default implementation of a model resolver based on a map.
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefaultModelResolver implements ModelResolver {
+    
+    private Contribution contribution;
+    private Map<Object, Object> map = new HashMap<Object, Object>();
+    
+    public DefaultModelResolver() {
+    }
+    
+    public DefaultModelResolver(Contribution contribution, FactoryExtensionPoint modelFactories) {
+        this.contribution = contribution;
+    }    
+    
+    public <T> T resolveModel(Class<T> modelClass, T unresolved, ProcessorContext context) {
+        Object resolved = map.get(unresolved);
+        if (resolved != null) {
+            
+            // Return the resolved object
+            return modelClass.cast(resolved);
+            
+        } else {
+            
+            // by default try and resolve through a default import
+            // if there is one. 
+            if (contribution != null){
+                for (Import _import : contribution.getImports()){
+                    if (_import instanceof DefaultImport){
+                        resolved = _import.getModelResolver().resolveModel(modelClass, unresolved, context);
+                        if (resolved != unresolved){
+                            return modelClass.cast(resolved);
+                        }
+                    }
+                }
+            }
+            
+            // Return the unresolved object
+            return unresolved;
+        }
+    }
+    
+    public void addModel(Object resolved, ProcessorContext context) {
+        map.put(resolved, resolved);
+    }
+    
+    public Object removeModel(Object resolved, ProcessorContext context) {
+        return map.remove(resolved);
+    }
+    
+    // FIXME: TUSCANY-2499: temporarily  give access to the models to get the jms binding
+    //  use of definitions.xml working while the definitions.xml processing is being refactored
+    public Map<Object, Object> getModels() {
+        return map;
+    }
+    
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/DefaultModelResolverExtensionPoint.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/DefaultModelResolverExtensionPoint.java
new file mode 100644
index 0000000000..a1eb85edca
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/DefaultModelResolverExtensionPoint.java
@@ -0,0 +1,131 @@
+/*
+ * 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.contribution.resolver;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.StringTokenizer;
+
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
+
+
+/**
+ * The default implementation of a model resolver extension point.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class DefaultModelResolverExtensionPoint implements ModelResolverExtensionPoint {
+    
+    private final Map<Class<?>, Class<? extends ModelResolver>> resolvers = new HashMap<Class<?>, Class<? extends ModelResolver>>();
+    private Map<String, ServiceDeclaration> loadedResolvers;
+    private ExtensionPointRegistry registry;
+
+    /**
+     * Constructs a new DefaultModelResolverExtensionPoint.
+     */
+    public DefaultModelResolverExtensionPoint(ExtensionPointRegistry registry) {
+        this.registry = registry;
+    }
+
+    public void addResolver(Class<?> modelType, Class<? extends ModelResolver> resolver) {
+        resolvers.put(modelType, resolver);
+    }
+
+    public void removeResolver(Class<?> modelType) {
+        resolvers.remove(modelType);
+    }
+
+    @SuppressWarnings("unchecked")
+    public Class<? extends ModelResolver> getResolver(Class<?> modelType) {
+        loadModelResolvers();
+        
+        Class<?>[] classes = modelType.getInterfaces();
+        for (Class<?> c : classes) {
+            Class<? extends ModelResolver> resolver = resolvers.get(c);
+            if (resolver == null) {
+                ServiceDeclaration resolverClass = loadedResolvers.get(c.getName());
+                if (resolverClass != null) {
+                    try {
+                        return (Class<? extends ModelResolver>)resolverClass.loadClass();
+                    } catch (ClassNotFoundException e) {
+                        throw new IllegalArgumentException(e);
+                    }
+                }
+            } else {
+                return resolver;
+            }
+        }
+
+        Class<? extends ModelResolver > resolver = resolvers.get(modelType);
+        if (resolver == null) {
+            ServiceDeclaration resolverClass = loadedResolvers.get(modelType.getName());
+            if (resolverClass != null) {
+                try {
+                    return (Class<? extends ModelResolver>)resolverClass.loadClass();
+                } catch (ClassNotFoundException e) {
+                    throw new IllegalArgumentException(e);
+                }
+            }
+        }
+        return resolver;
+    }
+
+    /**
+     * Dynamically load model resolvers declared under META-INF/services
+     */
+    private synchronized void loadModelResolvers() {
+        if (loadedResolvers != null)
+            return;
+        loadedResolvers = new HashMap<String, ServiceDeclaration>();
+
+        // Get the model resolver service declarations
+        Collection<ServiceDeclaration> modelResolverDeclarations; 
+        try {
+            modelResolverDeclarations = registry.getServiceDiscovery().getServiceDeclarations(ModelResolver.class, true);
+        } catch (IOException e) {
+            throw new IllegalStateException(e);
+        }
+        
+        List<ServiceDeclaration> list = new ArrayList<ServiceDeclaration>(modelResolverDeclarations);
+        
+        // Load model resolvers, add entries from lower ranking to higher ranking so that higher ranking ones override
+        // the map
+        for (int i = list.size() - 1; i >= 0; i--) {
+            ServiceDeclaration modelResolverDeclaration = list.get(i);
+            Map<String, String> attributes = modelResolverDeclaration.getAttributes();
+            String model = attributes.get("model");
+            // The model can be a list of interfaces so that one model resolver can be used
+            // to resolve different types of models
+            if (model != null) {
+                StringTokenizer tokenizer = new StringTokenizer(model);
+                while (tokenizer.hasMoreTokens()) {
+                    String key = tokenizer.nextToken();
+                    loadedResolvers.put(key, modelResolverDeclaration);
+                }
+
+            }
+        }
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/ExtensibleModelResolver.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/ExtensibleModelResolver.java
new file mode 100644
index 0000000000..72e4b03c7f
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/ExtensibleModelResolver.java
@@ -0,0 +1,179 @@
+/*
+ * 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.contribution.resolver;
+
+import java.lang.reflect.Constructor;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+
+/**
+ * An implementation of an extensible model resolver which delegates to the
+ * proper resolver extension based on the class of the model to resolve.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class ExtensibleModelResolver implements ModelResolver {
+    private final ModelResolverExtensionPoint resolverExtensions;
+    private final FactoryExtensionPoint modelFactories;
+    private final Contribution contribution;
+    private ModelResolver defaultResolver;
+    private final Map<Class<?>, ModelResolver> resolversByModelType = new HashMap<Class<?>, ModelResolver>();
+    private final Map<Class<?>, ModelResolver> resolversByImplementationClass = new HashMap<Class<?>, ModelResolver>();
+    private Map<Object, Object> map = new HashMap<Object, Object>();
+    private Object lastUnresolved;
+
+    /**
+     * Constructs an extensible model resolver
+     * 
+     * @param resolverExtensions
+     * @param contribution
+     * @param modelFactories
+     */
+    public ExtensibleModelResolver(Contribution contribution,
+                                   ModelResolverExtensionPoint resolverExtensions,
+                                   FactoryExtensionPoint modelFactories) {
+        this.contribution = contribution;
+        this.resolverExtensions = resolverExtensions;
+        this.modelFactories = modelFactories;
+    }
+
+    /**
+     * Returns the proper resolver instance based on the interfaces of the model
+     * If one is not available on the registry, instantiate on demand
+     * 
+     * @param modelType
+     * @return
+     */
+    private ModelResolver getModelResolverInstance(Class<?> modelType) {
+        // Look up a model resolver instance for the model class or
+        // each implemented interface
+        Class<?>[] interfaces = modelType.getInterfaces();
+        Class<?>[] classes = new Class<?>[interfaces.length + 1];
+        classes[0] = modelType;
+        if (interfaces.length != 0) {
+            System.arraycopy(interfaces, 0, classes, 1, interfaces.length);
+        }
+        for (Class<?> c : classes) {
+
+            // Look up an existing model resolver instance
+            ModelResolver resolverInstance = resolversByModelType.get(c);
+            if (resolverInstance != null) {
+                return resolverInstance;
+            }
+
+            // We don't have an instance, lookup a model resolver class
+            // and instantiate it
+            Class<? extends ModelResolver> resolverClass = resolverExtensions.getResolver(c);
+            if (resolverClass != null) {
+
+                // Construct the model resolver instance and cache it
+                resolverInstance = resolversByImplementationClass.get(resolverClass);
+                if (resolverInstance != null) {
+                    resolversByModelType.put(c, resolverInstance);
+                    return resolverInstance;
+                }
+                try {
+                    Constructor<? extends ModelResolver> constructor =
+                        resolverClass
+                            .getConstructor(new Class[] {Contribution.class, FactoryExtensionPoint.class});
+                    if (constructor != null) {
+
+                        resolverInstance = constructor.newInstance(contribution, modelFactories);
+                        resolversByImplementationClass.put(resolverClass, resolverInstance);
+                        resolversByModelType.put(c, resolverInstance);
+                        return resolverInstance;
+                    }
+                } catch (Exception e) {
+                    throw new IllegalStateException(e);
+                }
+            }
+        }
+
+        return null;
+    }
+
+    public void addModel(Object resolved, ProcessorContext context) {
+        ModelResolver resolver = getModelResolverInstance(resolved.getClass());
+        if (resolver != null) {
+            resolver.addModel(resolved, context);
+        } else {
+            map.put(resolved, resolved);
+        }
+    }
+
+    public Object removeModel(Object resolved, ProcessorContext context) {
+        ModelResolver resolver = getModelResolverInstance(resolved.getClass());
+        if (resolver != null) {
+            return resolver.removeModel(resolved, context);
+        } else {
+            return map.remove(resolved);
+        }
+    }
+
+    public <T> T resolveModel(Class<T> modelClass, T unresolved, ProcessorContext context) {
+        // Protect against dependency cycles causing infinite recursion
+        // Save the current unresolved object and check later if we are trying
+        // to resolve the same object again
+        if (unresolved == lastUnresolved) {
+            return unresolved;
+        }
+        lastUnresolved = unresolved;
+        
+        ModelResolver resolver = getModelResolverInstance(unresolved.getClass());
+        if (resolver != null) {
+            Object resolved = resolver.resolveModel(modelClass, unresolved, context);
+            if (resolved != null && resolved != unresolved) {
+                lastUnresolved = null;
+                return modelClass.cast(resolved);
+            }
+        } else {
+            //FIXME Remove this default resolver, this is currently used to resolve policy declarations
+            // but they should be handled by the contribution import/export mechanism instead of this
+            // defaultResolver hack.
+            if (defaultResolver != null) {
+                Object resolved = defaultResolver.resolveModel(modelClass, unresolved, context);
+                if (resolved != null && resolved != unresolved) {
+                    lastUnresolved = null;
+                    return modelClass.cast(resolved);
+                }
+            }
+            
+            Object resolved = map.get(unresolved);
+            if (resolved != null) {
+                // Return the resolved object
+                lastUnresolved = null;
+                return modelClass.cast(resolved);
+            }
+        }
+
+        return unresolved;
+    }
+    
+    // FIXME: TUSCANY-2499: temporarily  give access to the defaultResolver to get the jms binding
+    //  use of definitions.xml working while the definitions.xml processing is being refactored
+    public ModelResolver getDefaultModelResolver() {
+        return defaultResolver;
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/ModelResolver.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/ModelResolver.java
new file mode 100644
index 0000000000..c0267261f4
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/ModelResolver.java
@@ -0,0 +1,75 @@
+/*
+ * 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.contribution.resolver;
+
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+
+/**
+ * A model resolver, responsible for resolving models in the scope of an
+ * SCA contribution. 
+ * 
+ * SCA Assemblies reference artifacts of a wide variety of types. These
+ * include:
+ * <ul>
+ * <li> Reference from one SCA composite to another SCA composite
+ * <li> Reference to PolicySet files
+ * <li> Reference to interface definition files, either WSDL or Java interfaces
+ * <li> Reference to XSD files
+ * <li> Reference to any of a wide variety of implementation artifact files,
+ * including Java classes, BPEL scripts, C++ DLLs and classes, PHP scripts
+ * </ul>
+ * 
+ * In the SCA assemblies, these various artifacts are referenced using either
+ * QNames or logical URIs. Model resolvers are used to resolve these references
+ * and get the in-memory models representing the referenced artifacts.
+ * 
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.inheritfrom
+ */
+public interface ModelResolver {
+
+    /**
+     * Resolve the model representing an artifact.
+     * 
+     * @param modelClass the type of artifact
+     * @param unresolved the unresolved model
+     * @param context The context
+     * @return the resolved model
+     */
+    <T> T resolveModel(Class<T> modelClass, T unresolved, ProcessorContext context);
+    
+    /**
+     * Add a resolved model.
+     * 
+     * @param resolved The model
+     * @param context 
+     */
+    void addModel(Object resolved, ProcessorContext context);
+    
+    /**
+     * Remove a resolved model.
+     * 
+     * @param resolved
+     * @param context 
+     * @return The removed model, or null if the model was not removed
+     */
+    Object removeModel(Object resolved, ProcessorContext context);
+    
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/ModelResolverExtensionPoint.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/ModelResolverExtensionPoint.java
new file mode 100644
index 0000000000..4a25059792
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/ModelResolverExtensionPoint.java
@@ -0,0 +1,52 @@
+/*
+ * 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.contribution.resolver;
+
+
+/**
+ * An extension point for model resolvers
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface ModelResolverExtensionPoint {
+
+    /**
+     * Register a model resolver class using the model type as the key
+     * 
+     * @param modelType The model type
+     * @param resolver The model resolver Class
+     */
+    void addResolver(Class<?> modelType, Class <? extends ModelResolver> resolver);
+    
+    /**
+     * Remove the model resolver class for a specific model type
+     * 
+     * @param modelType The model type
+     */
+    void removeResolver(Class<?> modelType);
+    
+    /**
+     * Retrieve a model resolver class for a specific model type
+     * 
+     * @param modelType The model artifact type
+     * @return The model resolver Class
+     */
+    Class <? extends ModelResolver> getResolver(Class<?> modelType);
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/ResolverExtension.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/ResolverExtension.java
new file mode 100644
index 0000000000..bcf146cbfe
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/ResolverExtension.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.contribution.resolver;
+
+/**
+ * Extension to assembly model implementations to provide a model resolver.
+ *
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.asclient
+ */
+public interface ResolverExtension {
+
+    /**
+     * Returns the model resolver for the models representing the artifacts
+     * visible in the scope of this contribution.
+     * 
+     * @return The model resolver
+     */
+    ModelResolver getModelResolver();
+    
+    /**
+     * Sets the model resolver for the models representing the artifacts
+     * visible in the scope of this contribution.
+     * 
+     * @param modelResolver The model resolver
+     */
+    void setModelResolver(ModelResolver modelResolver);
+    
+}
\ No newline at end of file
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/ResourceReference.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/ResourceReference.java
new file mode 100644
index 0000000000..dfe8f08719
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/resolver/ResourceReference.java
@@ -0,0 +1,103 @@
+/*
+ * 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.contribution.resolver;
+
+import java.net.URL;
+
+/**
+ * A resource URL, which should be used to register resources
+ * with an ArtifactResolver and resolve these resources later.
+ * 
+ * FIXME Don't use as its deprecated, use Artifact instead.
+ *
+ * @version $Rev$ $Date$
+ */
+@Deprecated
+public class ResourceReference {
+    
+    private URL resourceURL;
+    private String resourceName;
+
+    /**
+     * Constructs a new ResourceReference.
+     * 
+     * @param resourceName Name of resource
+     * @param resourceURL  The resource URL
+     */
+    public ResourceReference(String resourceName, URL resourceURL) {
+        this.resourceURL = resourceURL;
+        this.resourceName = resourceName;
+    }
+    
+    /**
+     * Constructs a new ResourceReference.
+     * 
+     * @param resourceName Name of resource
+     */
+    public ResourceReference(String resourceName) {
+        this.resourceName = resourceName;
+    }
+    
+    /**
+     * Get the resource URL.
+     * 
+     * @return The resource URL
+     */
+    public URL getResource() {
+        return resourceURL;
+    }
+    
+    /**
+     * Get the resource name.
+     * 
+     * @return The resource name
+     */
+    public String getResourceName() {
+        return resourceName;
+    }
+    
+    /**
+     * Returns true if the resource reference is unresolved.
+     * 
+     * @return Whether or not the resource has been resolved
+     */
+    public boolean isUnresolved() {
+        return resourceURL == null;
+    }
+
+    @Override
+    public int hashCode() {
+        return resourceName.hashCode();
+    }
+    
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        } else {
+            if (obj instanceof ResourceReference) {
+                return resourceName.equals(((ResourceReference)obj).resourceName);
+            } else {
+                return false;
+            }
+        }
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/scanner/ContributionScanner.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/scanner/ContributionScanner.java
new file mode 100644
index 0000000000..91697111af
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/scanner/ContributionScanner.java
@@ -0,0 +1,55 @@
+/*
+ * 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.contribution.scanner;
+
+import java.io.IOException;
+import java.util.List;
+
+import org.apache.tuscany.sca.contribution.Artifact;
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.processor.ContributionReadException;
+
+/**
+ * Interface for contribution package scanners
+ *
+ * Contribution scanners understand the format of the contribution and how to get the
+ * artifacts in the contribution.
+ *
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.inheritfrom
+ */
+public interface ContributionScanner {
+
+    /**
+     * Returns the type of package supported by this package scanner.
+     *
+     * @return the package type
+     */
+    String getContributionType();
+
+    /**
+     * Returns a list of artifacts in the contribution.
+     *
+     * @param contribution Contribution URL
+     * @return List of artifact populated with URIs and location URL
+     * @throws ContributionReadException
+     * @throws IOException
+     */
+    List<Artifact> scan(Contribution contribution) throws ContributionReadException;
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/scanner/ContributionScannerExtensionPoint.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/scanner/ContributionScannerExtensionPoint.java
new file mode 100644
index 0000000000..1ca9def4ea
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/scanner/ContributionScannerExtensionPoint.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.contribution.scanner;
+
+/**
+ * An extension point for contribution scanners
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface ContributionScannerExtensionPoint {
+    
+    /**
+     * Add a ContributionScanner using the contribution type as the key.
+     * 
+     * @param scanner The contribution scanner
+     */
+    void addContributionScanner(ContributionScanner scanner);
+    
+    /**
+     * Remove a ContributionScanner.
+     * 
+     * @param scanner The contribution scanner
+     */
+    void removeContributionScanner(ContributionScanner scanner);
+    
+    /**
+     * Returns the ContributionScanner for the given contribution type.
+     * 
+     * @param contributionType The contribution type
+     * @return The contribution scanner
+     */
+    ContributionScanner getContributionScanner(String contributionType);
+    
+}
\ No newline at end of file
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/scanner/DefaultContributionScannerExtensionPoint.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/scanner/DefaultContributionScannerExtensionPoint.java
new file mode 100644
index 0000000000..c5aed5ccd3
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/scanner/DefaultContributionScannerExtensionPoint.java
@@ -0,0 +1,131 @@
+/*
+ * 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.contribution.scanner;
+
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.tuscany.sca.contribution.Artifact;
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.ContributionFactory;
+import org.apache.tuscany.sca.contribution.processor.ContributionReadException;
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
+
+/**
+ * Default implementation of a contribution scanner extension point.
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefaultContributionScannerExtensionPoint implements ContributionScannerExtensionPoint {
+
+    private Map<String, ContributionScanner> scanners = new HashMap<String, ContributionScanner>();
+    private boolean loaded;
+    private ExtensionPointRegistry registry;
+
+    public DefaultContributionScannerExtensionPoint(ExtensionPointRegistry registry) {
+        this.registry = registry;
+    }
+
+    public void addContributionScanner(ContributionScanner scanner) {
+        scanners.put(scanner.getContributionType(), scanner);
+    }
+
+    public void removeContributionScanner(ContributionScanner scanner) {
+        scanners.remove(scanner.getContributionType());
+    }
+
+    public ContributionScanner getContributionScanner(String contentType) {
+        loadScanners();
+        return scanners.get(contentType);
+    }
+
+    private synchronized void loadScanners() {
+        if (loaded)
+            return;
+
+        // Get the scanner service declarations
+        Collection<ServiceDeclaration> scannerDeclarations;
+        try {
+            scannerDeclarations = registry.getServiceDiscovery().getServiceDeclarations(ContributionScanner.class.getName());
+        } catch (IOException e) {
+            throw new IllegalStateException(e);
+        }
+
+        for (ServiceDeclaration scannerDeclaration: scannerDeclarations) {
+            Map<String, String> attributes = scannerDeclaration.getAttributes();
+
+            // Load a URL artifact scanner
+            String contributionType = attributes.get("type");
+
+            // Create a scanner wrapper and register it
+            ContributionScanner scanner = new LazyContributionScanner(registry, contributionType, scannerDeclaration);
+            addContributionScanner(scanner);
+        }
+
+        loaded = true;
+    }
+
+    /**
+     * A facade for contribution scanners.
+     */
+    private static class LazyContributionScanner implements ContributionScanner {
+        private ExtensionPointRegistry registry;
+        private ServiceDeclaration scannerDeclaration;
+        private String contributionType;
+        private ContributionScanner scanner;
+        private ContributionFactory contributionFactory;
+
+        private LazyContributionScanner(ExtensionPointRegistry registry, String contributionType, ServiceDeclaration scannerDeclaration) {
+            this.registry = registry;
+            this.scannerDeclaration = scannerDeclaration;
+            this.contributionType = contributionType;
+            
+            FactoryExtensionPoint factories = registry.getExtensionPoint(FactoryExtensionPoint.class);
+            this.contributionFactory = factories.getFactory(ContributionFactory.class);
+        }
+
+        public List<Artifact> scan(Contribution contributionSourceURL) throws ContributionReadException {
+            return getScanner().scan(contributionSourceURL);
+        }
+
+        public String getContributionType() {
+            return contributionType;
+        }
+
+        private ContributionScanner getScanner() {
+            if (scanner == null) {
+                try {
+                    Class<ContributionScanner> scannerClass = (Class<ContributionScanner>)scannerDeclaration.loadClass();
+                    Constructor<ContributionScanner> constructor = scannerClass.getConstructor(ContributionFactory.class);
+                    scanner = constructor.newInstance(contributionFactory);
+                } catch (Exception e) {
+                    throw new IllegalStateException(e);
+                }
+            }
+            return scanner;
+        }
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/scanner/impl/DirectoryContributionScanner.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/scanner/impl/DirectoryContributionScanner.java
new file mode 100644
index 0000000000..4a064c8fa9
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/scanner/impl/DirectoryContributionScanner.java
@@ -0,0 +1,173 @@
+/*
+ * 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.contribution.scanner.impl;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.security.AccessControlException;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import org.apache.tuscany.sca.contribution.Artifact;
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.ContributionFactory;
+import org.apache.tuscany.sca.contribution.PackageType;
+import org.apache.tuscany.sca.contribution.processor.ContributionReadException;
+import org.apache.tuscany.sca.contribution.scanner.ContributionScanner;
+
+/**
+ * Folder contribution processor.
+ *
+ * @version $Rev$ $Date$
+ */
+public class DirectoryContributionScanner implements ContributionScanner {
+	private static final Logger logger = Logger.getLogger(DirectoryContributionScanner.class.getName());
+
+    private ContributionFactory contributionFactory;
+
+    public DirectoryContributionScanner(ContributionFactory contributionFactory) {
+        this.contributionFactory = contributionFactory;
+    }
+
+    public String getContributionType() {
+        return PackageType.FOLDER;
+    }
+
+    public List<Artifact> scan(Contribution contribution) throws ContributionReadException {
+        File directory = directory(contribution);
+        List<Artifact> artifacts = new ArrayList<Artifact>();
+        List<String> artifactURIs = scanContributionArtifacts(contribution);
+        for(String uri : artifactURIs) {
+            try {
+                File file = new File(directory, uri);
+
+                Artifact artifact = contributionFactory.createArtifact();
+                artifact.setURI(uri);
+                artifact.setLocation(file.toURI().toURL().toString());
+
+                artifacts.add(artifact);
+            } catch (MalformedURLException e) {
+                throw new ContributionReadException(e);
+            }
+        }
+
+        contribution.getTypes().add(getContributionType());
+        return artifacts;
+    }
+
+
+    /**
+     * Scan the contribution to retrieve all artifact uris
+     *
+     * @param contribution
+     * @return
+     * @throws ContributionReadException
+     */
+    private List<String> scanContributionArtifacts(Contribution contribution) throws ContributionReadException {
+        File directory = directory(contribution);
+        List<String> artifacts = new ArrayList<String>();
+        // [rfeng] There are cases that the folder contains symbolic links that point to the same physical directory
+        Set<File> visited = new HashSet<File>();
+        try {
+            traverse(artifacts, directory, directory, visited);
+        } catch (IOException e) {
+            throw new ContributionReadException(e);
+        }
+
+        return artifacts;
+    }
+
+    /**
+     * Recursively traverse a root directory
+     *
+     * @param fileList
+     * @param file
+     * @param root
+     * @param visited The visited directories
+     * @throws IOException
+     */
+    private static void traverse(List<String> fileList, File file, File root, Set<File> visited) throws IOException {
+
+    	//TUSCANY-3667 - Google add some private directories when you deploy your application
+    	//to GAE and trying to execute file IO operations on it's contents fails with AccessControlException
+    	try {
+            if (file.isFile()) {
+                fileList.add(root.toURI().relativize(file.toURI()).toString());
+            } else if (file.isDirectory()) {
+                File dir = file.getCanonicalFile();
+                if (!visited.contains(dir)) {
+                    // [rfeng] Add the canonical file into the visited set to avoid duplicate navigation of directories
+                    // following the symbolic links
+                    visited.add(dir);
+                    String uri = root.toURI().relativize(file.toURI()).toString();
+                    if (uri.endsWith("/")) {
+                        uri = uri.substring(0, uri.length() - 1);
+                    }
+                    fileList.add(uri);
+
+                    File[] files = file.listFiles();
+                    for (File f : files) {
+                        if (!f.getName().startsWith(".")) {
+                            traverse(fileList, f, root, visited);
+                        }
+                    }
+                }
+            }
+    	} catch (AccessControlException e) {
+    		//TUSCANY-3667 - Log the AccessControlException error and continue without processing the file/directory
+    		logger.log(Level.WARNING, "Error traversing file:" + file.getPath());
+    	}
+
+    }
+
+    /**
+     * Get the contribution location as a file
+     *
+     * @param contribution
+     * @return
+     * @throws ContributionReadException
+     */
+    private File directory(Contribution contribution) throws ContributionReadException {
+        File file;
+        URI uri = null;
+        try {
+            uri = new URI(contribution.getLocation());
+            file = new File(uri);
+        } catch (URISyntaxException e) {
+            throw new ContributionReadException(e);
+        } catch(IllegalArgumentException e) {
+            // Hack for file:./a.txt or file:../a/c.wsdl
+            return new File(uri.getPath());
+        }
+        if (!file.exists() || !file.isDirectory()) {
+            throw new ContributionReadException(contribution.getLocation());
+        }
+        return file;
+    }
+
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/scanner/impl/JarContributionScanner.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/scanner/impl/JarContributionScanner.java
new file mode 100644
index 0000000000..25be92c310
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/scanner/impl/JarContributionScanner.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.contribution.scanner.impl;
+
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.jar.JarEntry;
+import java.util.jar.JarInputStream;
+
+import org.apache.tuscany.sca.common.java.io.IOHelper;
+import org.apache.tuscany.sca.contribution.Artifact;
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.ContributionFactory;
+import org.apache.tuscany.sca.contribution.PackageType;
+import org.apache.tuscany.sca.contribution.processor.ContributionReadException;
+import org.apache.tuscany.sca.contribution.scanner.ContributionScanner;
+
+/**
+ * JAR Contribution processor.
+ *
+ * @version $Rev$ $Date$
+ */
+public class JarContributionScanner implements ContributionScanner {
+    private ContributionFactory contributionFactory;
+
+    public JarContributionScanner(ContributionFactory contributionFactory) {
+        this.contributionFactory = contributionFactory;
+    }
+
+    public String getContributionType() {
+        return PackageType.JAR;
+    }
+
+    public List<Artifact> scan(Contribution contribution) throws ContributionReadException {
+
+        // Assume the URL references a JAR file
+        try {
+            URL url = new URL(contribution.getLocation());
+            JarInputStream jar = new JarInputStream(IOHelper.openStream(url));
+            try {
+                Set<String> names = new HashSet<String>();
+                while (true) {
+                    JarEntry entry = jar.getNextJarEntry();
+                    if (entry == null) {
+                        // EOF
+                        break;
+                    }
+
+                    String name = entry.getName();
+                    if (name.length() != 0 && !name.startsWith(".")) {
+
+                        // Trim trailing /
+                        if (name.endsWith("/")) {
+                            name = name.substring(0, name.length() - 1);
+                        }
+
+                        // Add the entry name
+                        if (!names.contains(name)) {
+                            names.add(name);
+
+                            // Add parent folder names to the list too
+                            for (;;) {
+                                int s = name.lastIndexOf('/');
+                                if (s == -1) {
+                                    name = "";
+                                } else {
+                                    name = name.substring(0, s);
+                                }
+                                if (name.length() != 0 && !names.contains(name)) {
+                                    names.add(name);
+                                } else {
+                                    break;
+                                }
+                            }
+                        }
+                    }
+                }
+
+                // Return list of artifacts
+                List<Artifact> artifacts = new ArrayList<Artifact>();
+                for(String uri : names) {
+                    Artifact artifact = contributionFactory.createArtifact();
+                    artifact.setURI(uri);
+                    artifact.setLocation(getArtifactURL(contribution, uri).toString());
+                    
+                    artifacts.add(artifact);
+                }
+                
+                contribution.getTypes().add(getContributionType());
+                return artifacts;
+
+            } finally {
+                jar.close();
+            }
+        } catch (IOException e) {
+            throw new ContributionReadException(e);
+        }
+    }
+    
+    /**
+     * Produces a location URL for a given artifact in the contribution
+     * 
+     * @param contribution
+     * @param artifact
+     * @return
+     * @throws ContributionReadException
+     */
+    private static URL getArtifactURL(Contribution contribution, String artifact) throws ContributionReadException {
+        try {
+            URL url;
+            if (contribution.toString().startsWith("jar:")) {
+                url = new URL(new URL(contribution.getLocation()), artifact.toString());
+            } else {
+                url = new URL("jar:" + contribution.getLocation() + "!/" + artifact);
+            }
+            return url;
+        } catch (MalformedURLException e) {
+            throw new ContributionReadException(e);
+        }
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/xml/ContributionGeneratedMetadataDocumentProcessor.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/xml/ContributionGeneratedMetadataDocumentProcessor.java
new file mode 100644
index 0000000000..0ad3ecbd4d
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/xml/ContributionGeneratedMetadataDocumentProcessor.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.contribution.xml;
+
+import javax.xml.stream.XMLInputFactory;
+
+import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+import org.apache.tuscany.sca.monitor.Monitor;
+
+/**
+ * URLArtifactProcessor that handles sca-contribution-generated.xml files.
+ *
+ * @version $Rev$ $Date$
+ */
+public class ContributionGeneratedMetadataDocumentProcessor extends ContributionMetadataDocumentProcessor {
+
+    public ContributionGeneratedMetadataDocumentProcessor(XMLInputFactory inputFactory,
+                                                          StAXArtifactProcessor staxProcessor) {
+        super(inputFactory, staxProcessor);
+    }
+
+    public ContributionGeneratedMetadataDocumentProcessor(FactoryExtensionPoint modelFactories,
+                                                          StAXArtifactProcessor staxProcessor) {
+        super(modelFactories, staxProcessor);
+    }
+
+    @Override
+    public String getArtifactType() {
+        return "/META-INF/sca-contribution-generated.xml";
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/xml/ContributionMetadataDocumentProcessor.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/xml/ContributionMetadataDocumentProcessor.java
new file mode 100644
index 0000000000..30220901a0
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/xml/ContributionMetadataDocumentProcessor.java
@@ -0,0 +1,127 @@
+/*
+ * 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.contribution.xml;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URI;
+import java.net.URL;
+
+import javax.xml.stream.XMLInputFactory;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+
+import org.apache.tuscany.sca.common.java.io.IOHelper;
+import org.apache.tuscany.sca.contribution.ContributionMetadata;
+import org.apache.tuscany.sca.contribution.processor.ContributionReadException;
+import org.apache.tuscany.sca.contribution.processor.ContributionResolveException;
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.URLArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.ValidatingXMLInputFactory;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.monitor.Problem;
+import org.apache.tuscany.sca.monitor.Problem.Severity;
+
+/**
+ * URLArtifactProcessor that handles sca-contribution.xml files.
+ *
+ * @version $Rev$ $Date$
+ */
+public class ContributionMetadataDocumentProcessor implements URLArtifactProcessor<ContributionMetadata>{
+    private final StAXArtifactProcessor staxProcessor;
+    private final XMLInputFactory inputFactory;
+
+    public ContributionMetadataDocumentProcessor(XMLInputFactory inputFactory,
+                                                 StAXArtifactProcessor staxProcessor) {
+        this.inputFactory = inputFactory;
+        this.staxProcessor = staxProcessor;
+    }
+
+    public ContributionMetadataDocumentProcessor(FactoryExtensionPoint modelFactories,
+                                                 StAXArtifactProcessor staxProcessor) {
+        this.inputFactory = modelFactories.getFactory(ValidatingXMLInputFactory.class);
+        this.staxProcessor = staxProcessor;
+    }
+
+    public String getArtifactType() {
+        return "/META-INF/sca-contribution.xml";
+    }
+
+    public Class<ContributionMetadata> getModelType() {
+        return ContributionMetadata.class;
+    }
+
+    public ContributionMetadata read(URL contributionURL, URI uri, URL url, ProcessorContext context) throws ContributionReadException {
+        InputStream urlStream = null;
+        try {
+
+            // Create a stream reader
+            urlStream = IOHelper.openStream(url);
+            XMLStreamReader reader = inputFactory.createXMLStreamReader(url.toString(), urlStream);
+            ValidatingXMLInputFactory.setMonitor(reader, context.getMonitor());
+
+            reader.nextTag();
+
+            // Read the contribution model
+            ContributionMetadata contribution = (ContributionMetadata)staxProcessor.read(reader, context);
+
+            return contribution;
+
+        } catch (XMLStreamException e) {
+        	ContributionReadException ex = new ContributionReadException(e);
+        	error(context.getMonitor(), "XMLStreamException", inputFactory, ex);
+        	throw ex;
+        } catch (IOException e) {
+        	ContributionReadException ex = new ContributionReadException(e);
+        	error(context.getMonitor(), "IOException", inputFactory, ex);
+            throw ex;
+        } finally {
+            try {
+                if (urlStream != null) {
+                    urlStream.close();
+                    urlStream = null;
+                }
+            } catch (IOException ioe) {
+                //ignore
+            }
+        }
+    }
+
+    public void resolve(ContributionMetadata contribution, ModelResolver resolver, ProcessorContext context) throws ContributionResolveException {
+        staxProcessor.resolve(contribution, resolver, context);
+    }
+
+    /**
+     * Report a exception.
+     *
+     * @param problems
+     * @param message
+     * @param model
+     */
+    private void error(Monitor monitor, String message, Object model, Exception ex) {
+        if (monitor != null) {
+            Problem problem = monitor.createProblem(this.getClass().getName(), "contribution-xml-validation-messages", Severity.ERROR, model, message, ex);
+            monitor.problem(problem);
+        }
+    }
+
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/xml/ContributionMetadataProcessor.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/xml/ContributionMetadataProcessor.java
new file mode 100644
index 0000000000..823684f422
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/xml/ContributionMetadataProcessor.java
@@ -0,0 +1,270 @@
+/*
+ * 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.contribution.xml;
+
+import static javax.xml.stream.XMLStreamConstants.START_ELEMENT;
+
+import java.util.List;
+
+import javax.xml.namespace.QName;
+import javax.xml.stream.XMLStreamConstants;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+import javax.xml.stream.XMLStreamWriter;
+
+import org.apache.tuscany.sca.assembly.AssemblyFactory;
+import org.apache.tuscany.sca.assembly.Composite;
+import org.apache.tuscany.sca.contribution.ContributionFactory;
+import org.apache.tuscany.sca.contribution.ContributionMetadata;
+import org.apache.tuscany.sca.contribution.Export;
+import org.apache.tuscany.sca.contribution.Import;
+import org.apache.tuscany.sca.contribution.java.JavaImport;
+import org.apache.tuscany.sca.contribution.java.JavaExport;
+import org.apache.tuscany.sca.contribution.processor.BaseStAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.ContributionReadException;
+import org.apache.tuscany.sca.contribution.processor.ContributionResolveException;
+import org.apache.tuscany.sca.contribution.processor.ContributionWriteException;
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.StAXAttributeProcessor;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.monitor.Problem;
+import org.apache.tuscany.sca.monitor.Problem.Severity;
+
+/**
+ * Processor for contribution metadata
+ *
+ * @version $Rev$ $Date$
+ */
+public class ContributionMetadataProcessor extends BaseStAXArtifactProcessor implements
+    StAXArtifactProcessor<ContributionMetadata> {
+    private static final String SCA11_NS = "http://docs.oasis-open.org/ns/opencsa/sca/200912";
+
+    private static final QName CONTRIBUTION_QNAME = new QName(SCA11_NS, "contribution");
+    private static final QName DEPLOYABLE_QNAME = new QName(SCA11_NS, "deployable");
+
+    private final AssemblyFactory assemblyFactory;
+    private final ContributionFactory contributionFactory;
+    private final StAXArtifactProcessor<Object> extensionProcessor;
+    private final StAXAttributeProcessor<Object> attributeProcessor;
+    
+
+    public ContributionMetadataProcessor(FactoryExtensionPoint modelFactories,
+                                         StAXArtifactProcessor<Object> extensionProcessor,
+                                         StAXAttributeProcessor<Object> attributeProcessor) {
+        this.assemblyFactory = modelFactories.getFactory(AssemblyFactory.class);
+        this.contributionFactory = modelFactories.getFactory(ContributionFactory.class);
+        this.extensionProcessor = extensionProcessor;
+        this.attributeProcessor = attributeProcessor;
+    }
+
+    /**
+     * Report a error.
+     *
+     * @param problems
+     * @param message
+     * @param model
+     */
+    private void error(Monitor monitor, String message, Object model, Object... messageParameters) {
+        if (monitor != null) {
+            Problem problem =
+                monitor.createProblem(this.getClass().getName(),
+                                      "contribution-xml-validation-messages",
+                                      Severity.ERROR,
+                                      model,
+                                      message,
+                                      (Object[])messageParameters);
+            monitor.problem(problem);
+        }
+    }
+
+    /**
+     * Report a exception.
+     *
+     * @param problems
+     * @param message
+     * @param model
+     */
+    private void error(Monitor monitor, String message, Object model, Exception ex) {
+        if (monitor != null) {
+            Problem problem =
+                monitor.createProblem(this.getClass().getName(), "contribution-xml-validation-messages", Severity.ERROR,
+                                model, message, ex);
+            monitor.problem(problem);
+        }
+    }
+
+    public QName getArtifactType() {
+        return CONTRIBUTION_QNAME;
+    }
+
+    public Class<ContributionMetadata> getModelType() {
+        return ContributionMetadata.class;
+    }
+
+    public ContributionMetadata read(XMLStreamReader reader, ProcessorContext context) throws ContributionReadException {
+        ContributionMetadata contribution = null;
+        QName name = null;
+
+        try {
+            while (reader.hasNext()) {
+                int event = reader.getEventType();
+                switch (event) {
+                    case START_ELEMENT:
+                        name = reader.getName();
+
+                        if (CONTRIBUTION_QNAME.equals(name)) {
+
+                            // Read <contribution>
+                            contribution = this.contributionFactory.createContributionMetadata();
+                            contribution.setSpecVersion(SCA11_NS);
+                            contribution.setUnresolved(true);
+                            readExtendedAttributes(reader, contribution, attributeProcessor, assemblyFactory, context);
+
+                        } else if (DEPLOYABLE_QNAME.equals(name)) {
+
+                            // Read <deployable>
+                            QName compositeName = getQName(reader, "composite");
+                            if (compositeName == null) {
+                                error(context.getMonitor(), "AttributeCompositeMissing", reader);
+                                //throw new ContributionReadException("Attribute 'composite' is missing");
+                            } else {
+                                if (contribution != null) {
+                                    Composite composite = assemblyFactory.createComposite();
+                                    composite.setName(compositeName);
+                                    composite.setUnresolved(true);
+                                    contribution.getDeployables().add(composite);
+                                }
+                            }
+                        } else {
+
+                            // Read an extension element
+                            Object extension = extensionProcessor.read(reader, context);
+                            if (extension != null && contribution != null) {
+                                if (extension instanceof Import) {
+                                    // The value of the @package attribute on the <import.java/> element MUST be
+                                	// unique across all other <import.java/> elements within the contribution.
+                                	if (extension instanceof JavaImport) {
+                                		for (Import imports : contribution.getImports()) {
+                                			if (imports instanceof JavaImport) {
+                                				if (((JavaImport)extension).getPackage().equals(((JavaImport) imports).getPackage())) {
+                                					error(context.getMonitor(), "DuplicateJavaImports", reader);
+                                				}
+                                			}
+                                		}
+                                	}
+                                	contribution.getImports().add((Import)extension);
+                                } else if (extension instanceof Export) {
+                                	// The value of the @package attribute on the <export.java/> element MUST be
+                                	// unique across all other <export.java/> elements within the contribution.
+                                	if (extension instanceof JavaExport) {
+                                		for (Export exports : contribution.getExports()) {
+                                			if (exports instanceof JavaExport) {
+                                				if (((JavaExport)extension).getPackage().equals(((JavaExport) exports).getPackage())) {
+                                					error(context.getMonitor(), "DuplicateJavaExports", reader);
+                                				}
+                                			}
+                                		}
+                                	}
+                                    contribution.getExports().add((Export)extension);
+                                } else {
+                                    contribution.getExtensions().add(extension);
+                                }
+                            }
+                        }
+                        break;
+
+                    case XMLStreamConstants.END_ELEMENT:
+                        if (CONTRIBUTION_QNAME.equals(reader.getName())) {
+                            return contribution;
+                        }
+                        break;
+                }
+
+                //Read the next element
+                if (reader.hasNext()) {
+                    reader.next();
+                }
+            }
+        } catch (XMLStreamException e) {
+            ContributionReadException ex = new ContributionReadException(e);
+            error(context.getMonitor(), "XMLStreamException", reader, ex);
+        }
+
+        return contribution;
+    }
+
+    public void write(ContributionMetadata contribution, XMLStreamWriter writer, ProcessorContext context) throws ContributionWriteException,
+        XMLStreamException {
+
+        // Write <contribution>
+        writeStartDocument(writer, CONTRIBUTION_QNAME.getNamespaceURI(), CONTRIBUTION_QNAME.getLocalPart());
+        writeExtendedAttributes(writer, contribution, attributeProcessor, context);
+
+        // Write <import>
+        for (Import imp : contribution.getImports()) {
+            extensionProcessor.write(imp, writer, context);
+        }
+
+        // Write <export>
+        for (Export export : contribution.getExports()) {
+            extensionProcessor.write(export, writer, context);
+        }
+
+        // Write <deployable>
+        for (Composite deployable : contribution.getDeployables()) {
+            writeStart(writer,
+                       DEPLOYABLE_QNAME.getNamespaceURI(),
+                       DEPLOYABLE_QNAME.getLocalPart(),
+                       new XAttr("composite", deployable.getName()));
+            writeEnd(writer);
+        }
+
+        writeEndDocument(writer);
+    }
+
+    public void resolve(ContributionMetadata contribution, ModelResolver resolver, ProcessorContext context) throws ContributionResolveException {
+
+        // Resolve imports and exports
+        for (Export export : contribution.getExports()) {
+            extensionProcessor.resolve(export, resolver, context);
+        }
+        for (Import import_ : contribution.getImports()) {
+            extensionProcessor.resolve(import_, resolver, context);
+        }
+
+        // Resolve deployable composites
+        List<Composite> deployables = contribution.getDeployables();
+        for (int i = 0, n = deployables.size(); i < n; i++) {
+            Composite deployable = deployables.get(i);
+            Composite resolved = (Composite)resolver.resolveModel(Composite.class, deployable, context);
+            if (resolved != deployable) {
+                deployables.set(i, resolved);
+            }
+        }
+
+        for (Object ext : contribution.getExtensions()) {
+            extensionProcessor.resolve(ext, resolver, context);
+        }
+
+        contribution.setUnresolved(false);
+    }
+}
diff --git a/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/xml/ContributionModelResolver.java b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/xml/ContributionModelResolver.java
new file mode 100644
index 0000000000..916630939e
--- /dev/null
+++ b/sca-java-2.x/branches/2.0-Beta2/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/xml/ContributionModelResolver.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.contribution.xml;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+
+/**
+ * A Model Resolver for Contribution models.
+ *
+ * @version $Rev$ $Date$
+ */
+public class ContributionModelResolver implements ModelResolver {
+
+    private Map<String, Contribution> map = new HashMap<String, Contribution>();
+    
+    public ContributionModelResolver(Contribution contribution, FactoryExtensionPoint modelFactories) {
+    }
+
+    public void addModel(Object resolved, ProcessorContext context) {
+        Contribution contribution = (Contribution)resolved;
+        map.put(contribution.getURI(), contribution);
+    }
+    
+    public Object removeModel(Object resolved, ProcessorContext context) {
+        return map.remove(((Contribution)resolved).getURI());
+    }
+    
+    public <T> T resolveModel(Class<T> modelClass, T unresolved, ProcessorContext context) {
+        
+        // Lookup a contribution for the given URI
+        String uri = ((Contribution)unresolved).getURI();
+        if (uri != null) {
+            Contribution resolved = (Contribution) map.get(uri);
+            if (resolved != null) {
+                return modelClass.cast(resolved);
+            }
+            return unresolved;
+        } else {
+            
+            // If no URI was specified, just return the first contribution
+            if (!map.isEmpty()) {
+                Contribution resolved = map.values().iterator().next();
+                return modelClass.cast(resolved);
+            } else {
+                return unresolved;
+            }
+        }
+    }
+    
+}