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diff --git a/sdext/source/pdfimport/tree/treevisiting.hxx b/sdext/source/pdfimport/tree/treevisiting.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * 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_PDFI_TREEVISITING_HXX
+#define INCLUDED_PDFI_TREEVISITING_HXX
+
+#include <sal/config.h>
+#include <list>
+
+
+namespace pdfi
+{
+    class  PDFIProcessor;
+    class  StyleContainer;
+    struct HyperlinkElement;
+    struct TextElement;
+    struct ParagraphElement;
+    struct FrameElement;
+    struct PolyPolyElement;
+    struct ImageElement;
+    struct PageElement;
+    struct DocumentElement;
+    struct EmitContext;
+    struct Element;
+
+    /** To be visited by all tree element types
+
+        Visitor interface from the "visitor pattern". Implementor gets
+        called with actual tree node instances.
+     */
+    struct ElementTreeVisitor
+    {
+        virtual void visit( HyperlinkElement&, const std::list< Element* >::const_iterator& ) = 0;
+        virtual void visit( TextElement&, const std::list< Element* >::const_iterator&  ) = 0;
+        virtual void visit( ParagraphElement&, const std::list< Element* >::const_iterator&  ) = 0;
+        virtual void visit( FrameElement&, const std::list< Element* >::const_iterator&  ) = 0;
+        virtual void visit( PolyPolyElement&, const std::list< Element* >::const_iterator&  ) = 0;
+        virtual void visit( ImageElement&, const std::list< Element* >::const_iterator&  ) = 0;
+        virtual void visit( PageElement&, const std::list< Element* >::const_iterator&  ) = 0;
+        virtual void visit( DocumentElement&, const std::list< Element* >::const_iterator&  ) = 0;
+    };
+    typedef boost::shared_ptr<ElementTreeVisitor> ElementTreeVisitorSharedPtr;
+
+    /** Visitee interface
+
+        To be implemented by every tree node that needs to be
+        visitable.
+     */
+    struct ElementTreeVisitable
+    {
+        virtual void visitedBy( ElementTreeVisitor&, const std::list< Element* >::const_iterator& rParentIt ) = 0;
+    };
+    typedef boost::shared_ptr<ElementTreeVisitable> ElementTreeVisitableSharedPtr;
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */