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diff --git a/src/datavisualization/data/qitemmodelsurfacedatamapping_p.h b/src/datavisualization/data/qitemmodelsurfacedatamapping_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc
+** All rights reserved.
+** For any questions to Digia, please use contact form at http://qt.digia.com
+**
+** This file is part of the QtDataVisualization module.
+**
+** Licensees holding valid Qt Enterprise licenses may use this file in
+** accordance with the Qt Enterprise License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.
+**
+** If you have questions regarding the use of this file, please use
+** contact form at http://qt.digia.com
+**
+****************************************************************************/
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the QtDataVisualization API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+
+#include "qitemmodelsurfacedatamapping.h"
+#include "qabstractdatamapping_p.h"
+
+#ifndef QITEMMODELSURFACEDATAMAPPING_P_H
+#define QITEMMODELSURFACEDATAMAPPING_P_H
+
+QT_DATAVISUALIZATION_BEGIN_NAMESPACE
+
+class QItemModelSurfaceDataMappingPrivate : public QAbstractDataMappingPrivate
+{
+    Q_OBJECT
+public:
+    QItemModelSurfaceDataMappingPrivate(QItemModelSurfaceDataMapping *q);
+    virtual ~QItemModelSurfaceDataMappingPrivate();
+
+private:
+    QString m_rowRole;
+    QString m_columnRole;
+    QString m_valueRole;
+
+    // For row/column items, sort items into these categories. Other categories are ignored.
+    QStringList m_rowCategories;
+    QStringList m_columnCategories;
+
+    friend class QItemModelSurfaceDataMapping;
+};
+
+QT_DATAVISUALIZATION_END_NAMESPACE
+
+#endif