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diff --git a/lib/kformula/kformulacompatibility.h b/lib/kformula/kformulacompatibility.h
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+++ b/lib/kformula/kformulacompatibility.h
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+/* This file is part of the KDE project
+   Copyright (C) 2001 Ulrich Kuettler <ulrich.kuettler@mailbox.tu-dresden.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 KFORMULACOMPATIBILITY_H
+#define KFORMULACOMPATIBILITY_H
+
+#include <qdom.h>
+#include <qstring.h>
+
+KFORMULA_NAMESPACE_BEGIN
+
+/**
+ * Converter from the other kformula lib string
+ * to a loadable dom.
+ */
+class Compatibility {
+public:
+
+    Compatibility();
+
+    /**
+     * Builds a kformula DOM from a old formula string.
+     */
+    QDomDocument buildDOM(QString text);
+
+private:
+
+    QDomElement readSequence(const QDomDocument& doc);
+    QDomElement readMatrix(const QDomDocument& doc);
+
+    void appendToSequence(QDomElement sequence, QDomElement element, int leftIndexSeen);
+
+    void appendNextSequence(const QDomDocument& doc, QDomElement element);
+    QDomElement getLastSequence(const QDomDocument& doc, QDomElement sequence);
+
+    QDomElement findIndexNode(const QDomDocument& doc, QDomElement sequence);
+
+    ushort nextToken() { return formulaString[pos++].unicode(); }
+    ushort lookAhead(uint i) const { return formulaString[pos+i].unicode(); }
+    void pushback() { pos--; }
+
+    bool hasNext() const { return pos < formulaString.length(); }
+    uint tokenLeft() const { return formulaString.length()-pos; }
+
+    /**
+     * the string we read
+     */
+    QString formulaString;
+
+    /**
+     * current pos
+     */
+    uint pos;
+};
+
+KFORMULA_NAMESPACE_END
+
+#endif // KFORMULACOMPATIBILITY_H