diff -r 000000000000 -r 1918ee327afb src/xmlpatterns/expr/qtreatas_p.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/xmlpatterns/expr/qtreatas_p.h	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,122 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 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_TreatAs_H
+#define Patternist_TreatAs_H
+
+#include "qsinglecontainer_p.h"
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+namespace QPatternist
+{
+    /**
+     * @short Implements XPath 2.0's <tt>treat as</tt> expression.
+     *
+     * TreatAs is always a compile-time class only, and is always deallocated
+     * by re-writing to CardinalityVerifier or ItemVerifier or both, by calling
+     * TypeChecker::applyFunctionConversion().
+     *
+     *
+     * One approach could be to skip instantiating TreatAs and simply let the
+     * return value of TypeChecker::applyFunctionConversion() be inserted into
+     * the AST, but that wouldn't handle type checking the context item
+     * properly, which depends on that the StaticContext have been set by the
+     * parent Expression.
+     *
+     * @see <a href="http://www.w3.org/TR/xpath20/#id-treat">XML Path Language
+     * (XPath) 2.0, 3.10.5 Treat</a>
+     * @author Frans Englich <frans.englich@nokia.com>
+     * @ingroup Patternist_expressions
+     */
+    class TreatAs : public SingleContainer
+    {
+    public:
+        /**
+         * Creats a TreatAs where it is checked that the expression @p operand conforms
+         * to the type @p reqType.
+         */
+        TreatAs(const Expression::Ptr &operand,
+                const SequenceType::Ptr &reqType);
+
+        /**
+         * This function rewrites always. First the type that this TreatAs expression tests for
+         * is verified. Then, the type the <tt>treat as</tt> expression itself must match, @p reqType,
+         * is verified.
+         */
+        virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
+                                          const SequenceType::Ptr &reqType);
+
+        /**
+         * @returns always the SequenceType passed in the constructor to this class. That is, the
+         * SequenceType that the operand must conform to.
+         */
+        virtual SequenceType::Ptr staticType() const;
+
+        /**
+         * @returns a list containing one CommonSequenceTypes::ZeroOrMoreItems
+         */
+        virtual SequenceType::List expectedOperandTypes() const;
+
+        virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
+
+    private:
+        const SequenceType::Ptr m_reqType;
+    };
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif