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diff --git a/sdext/source/pdfimport/inc/treevisiting.hxx b/sdext/source/pdfimport/inc/treevisiting.hxx
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+++ b/sdext/source/pdfimport/inc/treevisiting.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you 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 .
+ */
+
+#ifndef INCLUDED_SDEXT_SOURCE_PDFIMPORT_INC_TREEVISITING_HXX
+#define INCLUDED_SDEXT_SOURCE_PDFIMPORT_INC_TREEVISITING_HXX
+
+#include <sal/config.h>
+#include <list>
+#include <memory>
+
+namespace pdfi
+{
+    struct HyperlinkElement;
+    struct TextElement;
+    struct ParagraphElement;
+    struct FrameElement;
+    struct PolyPolyElement;
+    struct ImageElement;
+    struct PageElement;
+    struct DocumentElement;
+    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< std::unique_ptr<Element> >::const_iterator& ) = 0;
+        virtual void visit( TextElement&, const std::list< std::unique_ptr<Element> >::const_iterator&  ) = 0;
+        virtual void visit( ParagraphElement&, const std::list< std::unique_ptr<Element> >::const_iterator&  ) = 0;
+        virtual void visit( FrameElement&, const std::list< std::unique_ptr<Element> >::const_iterator&  ) = 0;
+        virtual void visit( PolyPolyElement&, const std::list< std::unique_ptr<Element> >::const_iterator&  ) = 0;
+        virtual void visit( ImageElement&, const std::list< std::unique_ptr<Element> >::const_iterator&  ) = 0;
+        virtual void visit( PageElement&, const std::list< std::unique_ptr<Element> >::const_iterator&  ) = 0;
+        virtual void visit( DocumentElement&, const std::list< std::unique_ptr<Element> >::const_iterator&  ) = 0;
+        virtual ~ElementTreeVisitor() {}
+    };
+    typedef std::shared_ptr<ElementTreeVisitor> ElementTreeVisitorSharedPtr;
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */