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diff --git a/sdo-java/branches/sdo-1.1-incubating/lib/src/main/java/org/apache/tuscany/sdo/api/Event.java b/sdo-java/branches/sdo-1.1-incubating/lib/src/main/java/org/apache/tuscany/sdo/api/Event.java
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+++ b/sdo-java/branches/sdo-1.1-incubating/lib/src/main/java/org/apache/tuscany/sdo/api/Event.java
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+/**
+ *
+ *  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.sdo.api;
+
+import commonj.sdo.Property;
+
+/**
+ * An experimental Tuscany API interface, subject to possible change,
+ * to permit notification of change events on a DataObject instance
+ */
+public interface Event {
+
+    Object getNotifier();
+
+    /**
+     * constants returned from getEventType()
+     */
+    int SET = 1;
+    int UNSET = 2;
+    int ADD = 3;
+    int REMOVE = 4;
+    int ADD_MANY = 5;
+    int REMOVE_MANY = 6;
+    int MOVE = 7; 
+    int REMOVE_LISTENER = 8;
+
+    int getEventType();
+
+    /**
+     * get the Property for which the value changed
+     */
+    Property getProperty();
+    Object getOldValue();
+    Object getNewValue();
+    
+    /*
+     * returns true if the Property value was in state "set" before this change occurred.
+     */
+    boolean wasSet();
+    boolean isTouch();
+
+    int NO_INDEX = -1;
+    int getPosition();
+
+  }
+