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diff --git a/src/xmlpatterns/schema/qxsdidcache_p.h b/src/xmlpatterns/schema/qxsdidcache_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtXmlPatterns 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@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_XsdIdCache_H
+#define Patternist_XsdIdCache_H
+
+#include "qschemacomponent_p.h"
+
+#include <QtCore/QExplicitlySharedDataPointer>
+#include <QtCore/QReadWriteLock>
+#include <QtCore/QSet>
+#include <QtCore/QString>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+namespace QPatternist
+{
+    /**
+     * @short Helper class for keeping track of all existing IDs in a schema.
+     *
+     * @ingroup Patternist_schema
+     * @author Tobias Koenig <tobias.koenig@trolltech.com>
+     */
+    class XsdIdCache : public QSharedData
+    {
+        public:
+            typedef QExplicitlySharedDataPointer<XsdIdCache> Ptr;
+
+            /**
+             * Adds an @p id to the id cache.
+             */
+            void addId(const QString &id);
+
+            /**
+             * Returns whether the id cache contains the given @p id already.
+             */
+            bool hasId(const QString &id) const;
+
+        private:
+            QSet<QString>          m_ids;
+            mutable QReadWriteLock m_lock;
+    };
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif