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diff --git a/src/xmlpatterns/expr/qunaryexpression.cpp b/src/xmlpatterns/expr/qunaryexpression.cpp
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+++ b/src/xmlpatterns/expr/qunaryexpression.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2011 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qarithmeticexpression_p.h"
+#include "qcommonvalues_p.h"
+#include "qliteral_p.h"
+#include "qschemanumeric_p.h"
+
+#include "qunaryexpression_p.h"
+
+QT_BEGIN_NAMESPACE
+
+using namespace QPatternist;
+
+UnaryExpression::UnaryExpression(const AtomicMathematician::Operator op,
+                                 const Expression::Ptr &operand,
+                                 const StaticContext::Ptr &context) : ArithmeticExpression(wrapLiteral(CommonValues::IntegerZero, context, operand.data()),
+                                                                                           op,
+                                                                                           operand)
+{
+    Q_ASSERT(op == AtomicMathematician::Substract ||
+             op == AtomicMathematician::Add);
+    Q_ASSERT(context);
+}
+
+Item UnaryExpression::evaluateSingleton(const DynamicContext::Ptr &context) const
+{
+    if(operatorID() == AtomicMathematician::Substract)
+    {
+        const Item item(m_operand2->evaluateSingleton(context));
+
+        if(item)
+            return item.as<Numeric>()->toNegated();
+        else
+            return Item();
+    }
+    else
+        return m_operand2->evaluateSingleton(context);
+}
+
+QT_END_NAMESPACE