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diff --git a/sdo-cpp/branches/sdo-cpp-pre2.1/runtime/core/src/commonj/sdo/DataGraph.h b/sdo-cpp/branches/sdo-cpp-pre2.1/runtime/core/src/commonj/sdo/DataGraph.h
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+++ b/sdo-cpp/branches/sdo-cpp-pre2.1/runtime/core/src/commonj/sdo/DataGraph.h
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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.
+ */
+
+/* $Rev$ $Date$ */
+
+#ifndef _DATAGRAPH_H_
+#define _DATAGRAPH_H_
+
+#include "commonj/sdo/RefCountingObject.h"
+#include "commonj/sdo/Type.h"
+#include "commonj/sdo/export.h"
+#include "commonj/sdo/DataObject.h"
+
+
+namespace commonj{
+namespace sdo{
+    
+/** 
+ * DataGraph holds a whole graph of data objects, starting from
+ * a single root. This class is not currently used in the C++
+ * implementation, but will be required by DAS implementations.
+ */
+
+class DataGraph : public RefCountingObject
+{
+     public:
+        virtual ~DataGraph();
+    
+    /**
+     *
+     * Gets the root data object of this graph.
+     */
+
+ 
+    virtual SDO_API DataObjectPtr getRootObject() = 0;
+    
+   /**
+     *
+     * gets the name of the element from which the root
+     * object was loaded (The XML definition).
+     */
+    virtual SDO_API const char*  getRootElementName() = 0;
+
+   /**
+     * Sets the Root data object.
+     *
+     */
+    virtual SDO_API void setRootObject(DataObjectPtr dob) = 0;
+
+   /**
+     * Creates a root data object - used by DAS implementations.
+     *
+     */
+
+    virtual SDO_API DataObjectPtr createRootObject(const char* uri,
+                        const char* name) = 0;
+    virtual SDO_API DataObjectPtr createRootObject(const SDOString& uri,
+                        const SDOString& name) = 0;
+
+   /**
+     * Creates a root data object - used by DAS implementations.
+     *
+     */
+
+    virtual SDO_API DataObjectPtr createRootObject(const Type& t) = 0;
+
+   /**
+     * Gets the change summary if there is one.
+     *
+     */
+
+    virtual SDO_API ChangeSummaryPtr getChangeSummary() = 0;
+
+   /**
+     * Gets a type from the data factory.
+     *
+     */
+
+    virtual SDO_API const Type& getType(const char* uri,
+                            const char* name) = 0;
+    virtual SDO_API const Type& getType(const SDOString& uri,
+                            const SDOString& name) = 0;
+
+
+};
+};
+};
+ 
+#endif //_DATAGRAPH_H_