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diff --git a/indra/llplugin/llpluginmessageclasses.h b/indra/llplugin/llpluginmessageclasses.h
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+/** 
+ * @file llpluginmessageclasses.h
+ * @brief This file defines the versions of existing message classes for LLPluginMessage.
+ *
+ * @cond
+ * $LicenseInfo:firstyear=2008&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ * @endcond
+ */
+
+#ifndef LL_LLPLUGINMESSAGECLASSES_H
+#define LL_LLPLUGINMESSAGECLASSES_H
+
+// Version strings for each plugin message class.  
+// Backwards-compatible changes (i.e. changes which only add new messges) should increment the minor version (i.e. "1.0" -> "1.1").
+// Non-backwards-compatible changes (which delete messages or change their semantics) should increment the major version (i.e. "1.1" -> "2.0").
+// Plugins will supply the set of message classes they understand, with version numbers, as part of their init_response message.
+// The contents and semantics of the base:init message must NEVER change in a non-backwards-compatible way, as a special case.
+
+#define LLPLUGIN_MESSAGE_CLASS_INTERNAL "internal"
+#define LLPLUGIN_MESSAGE_CLASS_INTERNAL_VERSION "1.0"
+
+#define LLPLUGIN_MESSAGE_CLASS_BASE "base"
+#define LLPLUGIN_MESSAGE_CLASS_BASE_VERSION "1.0"
+
+#define LLPLUGIN_MESSAGE_CLASS_MEDIA "media"
+#define LLPLUGIN_MESSAGE_CLASS_MEDIA_VERSION "1.0"
+
+#define LLPLUGIN_MESSAGE_CLASS_MEDIA_BROWSER "media_browser"
+#define LLPLUGIN_MESSAGE_CLASS_MEDIA_BROWSER_VERSION "1.0"
+
+#define LLPLUGIN_MESSAGE_CLASS_MEDIA_TIME "media_time"
+#define LLPLUGIN_MESSAGE_CLASS_MEDIA_TIME_VERSION "1.0"
+
+#endif // LL_LLPLUGINMESSAGECLASSES_H