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diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/modification/Modification.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/modification/Modification.java
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+/*
+ * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+
+package org.opendaylight.controller.cluster.datastore.modification;
+
+import org.opendaylight.controller.sal.core.spi.data.DOMStoreWriteTransaction;
+
+/**
+ * Represents a modification to the data store.
+ * <p>
+ * Simple modifications can be of type,
+ * <li> {@link org.opendaylight.controller.cluster.datastore.modification.WriteModification}
+ * <li> {@link org.opendaylight.controller.cluster.datastore.modification.MergeModification}
+ * <li> {@link org.opendaylight.controller.cluster.datastore.modification.DeleteModification}
+ * </p>
+ *
+ * <p>
+ * Modifications can in turn be lumped into a single {@link org.opendaylight.controller.cluster.datastore.modification.CompositeModification}
+ * which can then be applied to a write transaction
+ * </p>
+ */
+public interface Modification {
+  /**
+   * Apply the modification to the specified transaction
+   * @param transaction
+   */
+  void apply(DOMStoreWriteTransaction transaction);
+}