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diff --git a/src/org/jivesoftware/smackx/ChatStateListener.java b/src/org/jivesoftware/smackx/ChatStateListener.java
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+/**
+ * $RCSfile$
+ * $Revision: 2407 $
+ * $Date: 2004-11-02 15:37:00 -0800 (Tue, 02 Nov 2004) $
+ *
+ * Copyright 2003-2007 Jive Software.
+ *
+ * All rights reserved. Licensed 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.jivesoftware.smackx;
+
+import org.jivesoftware.smack.Chat;
+import org.jivesoftware.smack.MessageListener;
+
+/**
+ * Events for when the state of a user in a chat changes.
+ *
+ * @author Alexander Wenckus
+ */
+public interface ChatStateListener extends MessageListener {
+
+    /**
+     * Fired when the state of a chat with another user changes.
+     *
+     * @param chat the chat in which the state has changed.
+     * @param state the new state of the participant.
+     */
+    void stateChanged(Chat chat, ChatState state);
+}