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diff --git a/src/api/studio3d/q3dsdatainput_p.h b/src/api/studio3d/q3dsdatainput_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt 3D Studio.
+**
+** $QT_BEGIN_LICENSE:GPL$
+** 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 https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 or (at your option) any later version
+** approved by the KDE Free Qt Foundation. The licenses are as published by
+** the Free Software Foundation and appearing in the file LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef Q3DSDATAINPUT_P_P_H
+#define Q3DSDATAINPUT_P_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the QtStudio3D 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 "q3dsdatainput.h"
+#include "q3dscommandqueue_p.h"
+#include "Qt3DSViewerApp.h"
+
+QT_BEGIN_NAMESPACE
+
+class Q3DSPresentationPrivate;
+
+class Q_STUDIO3D_EXPORT Q3DSDataInputPrivate
+{
+    Q_DECLARE_PUBLIC(Q3DSDataInput)
+public:
+    explicit Q3DSDataInputPrivate(Q3DSDataInput *parent);
+    virtual ~Q3DSDataInputPrivate();
+
+    void setValue(const QVariant &value,
+                  Q3DSDataInput::ValueRole valueRole = Q3DSDataInput::ValueRole::Value);
+    void setViewerApp(Q3DSViewer::Q3DSViewerApp *app);
+    void setCommandQueue(CommandQueue *queue);
+    void setPresentation(Q3DSPresentation *presentation);
+
+protected:
+    Q3DSDataInput *q_ptr;
+    Q3DSViewer::Q3DSViewerApp *m_viewerApp = nullptr; // Not owned
+    CommandQueue *m_commandQueue = nullptr; // Not owned
+    Q3DSPresentation *m_presentation = nullptr; // Not owned
+    QString m_name;
+    // Local cached values, used only when synchronous getter from runtime engine
+    // is not available (for QML -side that is behind command queue).
+    QVariant m_value;
+    float m_max = 0;
+    float m_min = 0;
+
+    // Note: Qt3d Runtime allows metadata to be both read and set, therefore requiring
+    // internal representation of both keys and values to be QVariant as per API convention.
+    // OpenGL Runtime, in contrast, only allows metadata to be read. As metadata now can only
+    // come from UIA file where it is stored as string, we use QStrings in API as well.
+    QHash<QString, QString> m_metadata;
+
+    friend class Q3DSPresentationPrivate;
+    friend class Q3DSRenderer;
+};
+
+QT_END_NAMESPACE
+
+#endif // Q3DSDATAINPUT_P_P_H