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diff --git a/sd/source/ui/slidesorter/inc/model/SlsEnumeration.hxx b/sd/source/ui/slidesorter/inc/model/SlsEnumeration.hxx
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+++ b/sd/source/ui/slidesorter/inc/model/SlsEnumeration.hxx
@@ -0,0 +1,56 @@
+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2008 by Sun Microsystems, Inc.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * $RCSfile: SlsEnumeration.hxx,v $
+ * $Revision: 1.5 $
+ *
+ * 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 SD_SLIDESORTER_ENUMERATION_HXX
+#define SD_SLIDESORTER_ENUMERATION_HXX
+
+#include <memory>
+
+namespace sd { namespace slidesorter { namespace model {
+
+
+/** Interface to generic enumerations.  Designed to operate on shared
+    pointers.  Therefore GetNextElement() returns T and not T&.
+*/
+template <class T>
+class Enumeration
+{
+public:
+    virtual bool HasMoreElements (void) const = 0;
+    /** Returns T instead of T& so that it can handle shared pointers.
+    */
+    virtual T GetNextElement (void) = 0;
+    virtual void Rewind (void) = 0;
+    virtual ::std::auto_ptr<Enumeration<T> > Clone (void) = 0;
+};
+
+} } } // end of namespace ::sd::slidesorter::model
+
+#endif