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diff --git a/slideshow/source/inc/state.hxx b/slideshow/source/inc/state.hxx
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+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org 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 version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#ifndef INCLUDED_SLIDESHOW_STATE_HXX
+#define INCLUDED_SLIDESHOW_STATE_HXX
+
+#include <sal/types.h>
+#include <boost/shared_ptr.hpp>
+
+
+/* Definition of State interface */
+
+namespace slideshow
+{
+    namespace internal
+    {
+
+        /** This interface represents a stateful object.
+
+            The state ID returned by the getStateId() method
+            abstractly encodes the object's state. When this ID
+            changes, clients can assume that the object's state has
+            changed.
+         */
+        class State
+        {
+        public:
+            virtual ~State() {}
+
+            /// Abstract, numerically encoded state ID
+            typedef ::std::size_t StateId;
+
+            /** This method returns a numerical state identifier.
+
+                The state ID returned by this method abstractly
+                encodes the object's state. When this ID changes,
+                clients can assume that the object's state has
+                changed.
+
+                @return an abstract, numerical state ID.
+             */
+            virtual StateId getStateId() const = 0;
+        };
+
+        typedef ::boost::shared_ptr< State > StateSharedPtr;
+    }
+}
+
+#endif /* INCLUDED_SLIDESHOW_STATE_HXX */