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diff --git a/sandbox/lresende/backup/company-das/src/main/java/das/DASService.java b/sandbox/lresende/backup/company-das/src/main/java/das/DASService.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 das;
+
+import java.io.InputStream;
+import java.util.Vector;
+
+import commonj.sdo.DataObject;
+
+public interface DASService {
+
+    /**
+     * Set DAS configuration file to be used
+     * @param configStream
+     * @throws DASServiceException
+     */
+    public void configureService(InputStream configStream) throws DASServiceException;
+
+    /**
+     * Execute an existing command. The commands are defined in the DAS Configuration file being used by the service
+     * @param commandName Command name as it appears on the DAS Configuration file
+     * @param commandArguments Vector with arguments to be used by the command
+     * @throws DASServiceException
+     * @return
+     */
+    public DataObject executeCommand(String commandName, Vector commandArguments) throws DASServiceException;
+
+    /**
+     * Execute a new command, this can be any arbitrary valid query based on the backend implementation (e.g. SQL Query for DAS RDB)
+     * @param adHocQuery A new command to be executed (e.g SQL Query)
+     * @param commandArguments Vector with arguments to be used by the command
+     * @throws DASServiceException
+     * @return
+     */
+    public DataObject execute(String adHocQuery, Vector commandArguments) throws DASServiceException;
+
+    /**
+     * Apply all changes on the graph back to the persistent repository.
+     * This would save the changes on the SDO ChangeSummary back to the database
+     * Note: Your SDO ojects should have been created with ChangeSummary support
+     * @param graphRoot SDO Object with changes to be commited to persistent repository
+     * @throws DASServiceException
+     */
+    public void applyChanges(DataObject graphRoot) throws DASServiceException;
+}