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diff --git a/lib/kformula/elementvisitor.h b/lib/kformula/elementvisitor.h
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+/* This file is part of the KDE project
+   Copyright (C) 2003 Ulrich Kuettler <ulrich.kuettler@gmx.de>
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+
+   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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public License
+   along with this library; see the file COPYING.LIB.  If not, write to
+   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+*/
+
+#ifndef ELEMENTVISITOR_H
+#define ELEMENTVISITOR_H
+
+#include "kformuladefs.h"
+
+KFORMULA_NAMESPACE_BEGIN
+
+class BasicElement;
+class BracketElement;
+class EmptyElement;
+class FractionElement;
+class IndexElement;
+class MatrixElement;
+class MultilineElement;
+class NameSequence;
+class OverlineElement;
+class RootElement;
+class SequenceElement;
+class SpaceElement;
+class SymbolElement;
+class TextElement;
+class UnderlineElement;
+
+
+/**
+ * Visitor. Provides a way to add new functionality to the element tree.
+ */
+class ElementVisitor {
+public:
+
+    virtual ~ElementVisitor() {}
+
+    virtual bool visit( BracketElement* ) { return true; }
+    virtual bool visit( EmptyElement* ) { return true; }
+    virtual bool visit( FractionElement* ) { return true; }
+    virtual bool visit( IndexElement* ) { return true; }
+    virtual bool visit( MatrixElement* ) { return true; }
+    virtual bool visit( MultilineElement* ) { return true; }
+    virtual bool visit( NameSequence* ) { return true; }
+    virtual bool visit( OverlineElement* ) { return true; }
+    virtual bool visit( RootElement* ) { return true; }
+    virtual bool visit( SequenceElement* ) { return true; }
+    virtual bool visit( SpaceElement* ) { return true; }
+    virtual bool visit( SymbolElement* ) { return true; }
+    virtual bool visit( TextElement* ) { return true; }
+    virtual bool visit( UnderlineElement* ) { return true; }
+};
+
+KFORMULA_NAMESPACE_END
+
+#endif // ELEMENTVISITOR_H