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diff --git a/src/xmlpatterns/schema/qxsdparticlechecker_p.h b/src/xmlpatterns/schema/qxsdparticlechecker_p.h
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+++ b/src/xmlpatterns/schema/qxsdparticlechecker_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 $MODULE$ of the Qt Toolkit.
+**
+** $TROLLTECH_DUAL_LICENSE$
+**
+****************************************************************************/
+
+//
+//  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_XsdParticleChecker_H
+#define Patternist_XsdParticleChecker_H
+
+#include "qxsdelement_p.h"
+#include "qxsdparticle_p.h"
+#include "qxsdschemacontext_p.h"
+#include "qxsdwildcard_p.h"
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+namespace QPatternist
+{
+    /**
+     * @short A helper class to check validity of particles.
+     *
+     * @ingroup Patternist_schema
+     * @author Tobias Koenig <tobias.koenig@trolltech.com>
+     */
+    class XsdParticleChecker
+    {
+        public:
+            /**
+             * Checks whether the given @p particle has two or more element
+             * declarations with the same name but different type definitions.
+             */
+            static bool hasDuplicatedElements(const XsdParticle::Ptr &particle, const NamePool::Ptr &namePool, XsdElement::Ptr &conflictingElement);
+
+            /**
+             * Checks whether the given @p particle is valid according the
+             * UPA (http://www.w3.org/TR/xmlschema-1/#cos-nonambig) constraint.
+             */
+            static bool isUPAConform(const XsdParticle::Ptr &particle, const NamePool::Ptr &namePool);
+
+            /**
+             * Checks whether the given @p particle subsumes the given @p derivedParticle.
+             * (http://www.w3.org/TR/xmlschema-1/#cos-particle-restrict)
+             */
+            static bool subsumes(const XsdParticle::Ptr &particle, const XsdParticle::Ptr &derivedParticle, const XsdSchemaContext::Ptr &context, QString &errorMsg);
+    };
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif