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+/****************************************************************************
+**
+** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtXmlPatterns module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt 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.
+
+#ifndef Patternist_XsdAttributeReference_H
+#define Patternist_XsdAttributeReference_H
+
+#include "qxsdattributeuse_p.h"
+
+#include <QtXmlPatterns/QSourceLocation>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+namespace QPatternist
+{
+    /**
+     * @short A helper class for attribute reference resolving.
+     *
+     * For easy resolving of attribute references, we have this class
+     * that can be used as a place holder for the real attribute use
+     * object it is referring to.
+     * So whenever the parser detects an attribute reference, it creates
+     * a XsdAttributeReference and returns it instead of the XsdAttributeUse.
+     * During a later phase, the resolver will look for all XsdAttributeReferences
+     * in the schema and will replace them with their referring XsdAttributeUse
+     * objects.
+     *
+     * @ingroup Patternist_schema
+     * @author Tobias Koenig <tobias.koenig@nokia.com>
+     */
+    class XsdAttributeReference : public XsdAttributeUse
+    {
+        public:
+            typedef QExplicitlySharedDataPointer<XsdAttributeReference> Ptr;
+
+            /**
+             * Describes the type of the attribute reference.
+             */
+            enum Type
+            {
+                AttributeUse,   ///< The reference points to an attribute use.
+                AttributeGroup  ///< The reference points to an attribute group.
+            };
+
+            /**
+             * Always returns false, used to avoid dynamic casts.
+             */
+            virtual bool isAttributeUse() const;
+
+            /**
+             * Always returns true, used to avoid dynamic casts.
+             */
+            virtual bool isReference() const;
+
+            /**
+             * Sets the @p type of the attribute reference.
+             */
+            void setType(Type type);
+
+            /**
+             * Returns the type of the attribute reference.
+             */
+            Type type() const;
+
+            /**
+             * Sets the @p name of the attribute or attribute group the
+             * attribute reference refers to.
+             */
+            void setReferenceName(const QXmlName &name);
+
+            /**
+             * Returns the name of the attribute or attribute group the
+             * attribute reference refers to.
+             */
+            QXmlName referenceName() const;
+
+            /**
+             * Sets the source @p location where the reference is located.
+             */
+            void setSourceLocation(const QSourceLocation &location);
+
+            /**
+             * Returns the source location where the reference is located.
+             */
+            QSourceLocation sourceLocation() const;
+
+        private:
+            Type            m_type;
+            QXmlName        m_referenceName;
+            QSourceLocation m_sourceLocation;
+    };
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif