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diff --git a/src/xmlpatterns/functions/qbooleanfns.cpp b/src/xmlpatterns/functions/qbooleanfns.cpp
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+++ b/src/xmlpatterns/functions/qbooleanfns.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 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.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qoptimizationpasses_p.h"
+
+#include "qbooleanfns_p.h"
+
+QT_BEGIN_NAMESPACE
+
+using namespace QPatternist;
+
+bool TrueFN::evaluateEBV(const DynamicContext::Ptr &) const
+{
+    return true;
+}
+
+bool FalseFN::evaluateEBV(const DynamicContext::Ptr &) const
+{
+    return false;
+}
+
+bool NotFN::evaluateEBV(const DynamicContext::Ptr &context) const
+{
+    /* That little '!' is quite important in this function -- I forgot it ;-) */
+    return !m_operands.first()->evaluateEBV(context);
+}
+
+OptimizationPass::List NotFN::optimizationPasses() const
+{
+    return OptimizationPasses::notFN;
+}
+
+QT_END_NAMESPACE