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diff --git a/src/libs/modelinglib/qmt/diagram/delement.h b/src/libs/modelinglib/qmt/diagram/delement.h
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+/***************************************************************************
+**
+** Copyright (C) 2015 Jochen Becher
+** Contact: http://www.qt.io/licensing
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company.  For licensing terms and
+** conditions see http://www.qt.io/terms-conditions.  For further information
+** use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file.  Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, The Qt Company gives you certain additional
+** rights.  These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#ifndef QMT_DELEMENT_H
+#define QMT_DELEMENT_H
+
+#include "qmt/infrastructure/uid.h"
+
+#include <QString>
+
+namespace qmt {
+
+class DVisitor;
+class DConstVisitor;
+
+class QMT_EXPORT DElement
+{
+public:
+    DElement();
+    virtual ~DElement();
+
+    Uid uid() const { return m_uid; }
+    void setUid(const Uid &uid);
+    void renewUid();
+    virtual Uid modelUid() const = 0;
+
+    virtual void accept(DVisitor *visitor);
+    virtual void accept(DConstVisitor *visitor) const;
+
+private:
+    Uid m_uid;
+};
+
+} // namespace qmt
+
+#endif // QMT_DELEMENT_H