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diff --git a/sca-java-1.x/tags/java-stable-20060304/sca/core/src/main/java/org/apache/tuscany/core/context/InstanceContext.java b/sca-java-1.x/tags/java-stable-20060304/sca/core/src/main/java/org/apache/tuscany/core/context/InstanceContext.java
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+++ b/sca-java-1.x/tags/java-stable-20060304/sca/core/src/main/java/org/apache/tuscany/core/context/InstanceContext.java
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+/**
+ *
+ *  Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
+ *
+ *  Licensed 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.core.context;
+
+/**
+ * Manages instances of a runtime artifact. An <code>InstanceContext</code> may contain child contexts which
+ * themselves manage implementation instances or it may be a leaf context.
+ * 
+ * @see org.apache.tuscany.core.context.SimpleComponentContext
+ * @see org.apache.tuscany.core.context.AggregateContext
+ * @see org.apache.tuscany.core.context.EntryPointContext
+ * @see org.apache.tuscany.core.context.ExternalServiceContext
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface InstanceContext extends Context {
+
+    /**
+     * Returns the instance associated with the requested name, which may be in a simple or compound form. Simple (i.e.
+     * leaf) contexts will return an instance associated with the service name part of the compound name, which may be
+     * null.
+     * <p>
+     * Aggregate contexts will return an instance (likely a proxy) of a contained entry point context. In this case, the
+     * port name on the qualified name will correspond to the aggregate context name and the part name will be used to
+     * retrieve the contained entry point context. The latter may be null. If the contained context is not an entry
+     * point context, an exception will be thrown.
+     * 
+     * @param qName a qualified name of the requested instance
+     * @return the implementation instance or a proxy to it
+     * @throws TargetException if an error occurs retrieving the instance or the requested component is not an entry
+     *         point.
+     * 
+     * @see AggregateContext
+     * @see org.apache.tuscany.model.assembly.EntryPoint
+     */
+    public Object getInstance(QualifiedName qName) throws TargetException;
+
+    /**
+     * Returns an instance associated with the requested name without notifying <code>ContextEventListener</code>s
+     * that may be registered with this context on instance creation. Note that {@link #getInstance(QualifiedName)}
+     * should generally be called and this method is only provided as an optimization for particular circumstances.
+     * 
+     * @param qName a qualified name of the requested instance
+     * @param notify whether to notify <code>ContextEventListener</code>s
+     * @return the instance or a proxy to it
+     * @throws TargetException if an error occurs retrieving the instance or proxy
+     * @see LifecycleEventListener
+     */
+    public Object getInstance(QualifiedName qName, boolean notify) throws TargetException;
+
+    /**
+     * Returns the implementation instance associated witht he component. An implementation instance does not
+     * have a proxy invocation chainXXX
+     * @return
+     * @throws TargetException
+     */
+    public Object getImplementationInstance() throws TargetException;
+
+    public Object getImplementationInstance(boolean notify) throws TargetException;
+
+}