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diff --git a/das-java/branches/das-java-beta2/rdb/src/main/java/org/apache/tuscany/das/rdb/Converter.java b/das-java/branches/das-java-beta2/rdb/src/main/java/org/apache/tuscany/das/rdb/Converter.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.das.rdb;
+
+/**
+ * A lightweight Table-column <--> DataObject-property converter framework. Converters 
+ * allow a user to insert a transformation between a column value
+ * and is destination DataObject property value. For example, by default, a VARCHAR 
+ * column will be represented as a String in its corresponding
+ * DataObject property. A user could insert a converter that transforms the the VARCHAR 
+ * value to an Integer. If this is done then although the column
+ * returns character data, the DataObject property will be an Integer
+ * 
+ * 
+ */
+public interface Converter {
+
+    /**
+     * Transform the columnData object to a new value and possibly 
+     * new type. This should be the invers operation of #getColumnValue
+     * 
+     * @param columnData
+     *            The column value to transorm
+     * @return Returns the transformed value
+     */
+    Object getPropertyValue(Object columnData);
+
+    /**
+     * Transform the columnData object to a new value and possibly new 
+     * type. This should be the invers operation of #getPropertyValue
+     * 
+     * @param propertyData
+     *            The property value to transform
+     * @return Returns the transformed value
+     */
+    Object getColumnValue(Object propertyData);
+
+}