diff -r 000000000000 -r 1918ee327afb src/xmlpatterns/expr/qexpressionsequence_p.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/xmlpatterns/expr/qexpressionsequence_p.h	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,127 @@
+/****************************************************************************
+**
+** 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_ExpressionSequence_H
+#define Patternist_ExpressionSequence_H
+
+#include "qunlimitedcontainer_p.h"
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+namespace QPatternist
+{
+    /**
+     * @short Implements the comma(",") operator, the sequence constructor.
+     *
+     * For example, the expression <tt>alpha, beta</tt> evaluates to a sequence
+     * containing the items the nodetest @c alpha evaluates to, concatenated
+     * with the items the nodetest @c beta evaluates to.
+     *
+     * @see <a href="http://www.w3.org/TR/xpath20/#construct_seq">XML Path Language
+     * (XPath) 2.0, 3.3.1 Constructing Sequences</a>
+     * @author Frans Englich <frans.englich@nokia.com>
+     * @ingroup Patternist_expressions
+     */
+    class ExpressionSequence : public UnlimitedContainer
+    {
+    public:
+        /**
+         * Creates an ExpressionSequence with the operands @p operands. @p operands
+         * must contain two or more Expression instances.
+         */
+        ExpressionSequence(const Expression::List &operands);
+
+        virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &) const;
+
+        /**
+         * Forwards the call to its children.
+         */
+        virtual void evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const;
+
+        virtual SequenceType::List expectedOperandTypes() const;
+        virtual SequenceType::Ptr staticType() const;
+
+        /**
+         * Removes any empty sequences, typically "()", from its list of children. If
+         * after that rewrite has no children, it rewrites itself to the CommonValues::empty;
+         * if it has only one, it rewrites to the child.
+         *
+         * This optimization is not very usable by itself, but potentially becomes effective after other
+         * optimizations have rewritten themselves into empty sequences. Thus,
+         * saving memory consumption and runtime overhead.
+         */
+        virtual Expression::Ptr compress(const StaticContext::Ptr &context);
+
+        inline Item::Iterator::Ptr mapToSequence(const Expression::Ptr &,
+                                                 const DynamicContext::Ptr &) const;
+
+        virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
+                                          const SequenceType::Ptr &reqType);
+        /**
+         * @returns Expression::DisableElimination, plus the union
+         * of all this ExpressionSequence's children's properties. If any child
+         * does not have IsEvaluated, it is removed from the result.
+         */
+        virtual Expression::Properties properties() const;
+        virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
+        virtual ID id() const;
+    private:
+        typedef QExplicitlySharedDataPointer<const ExpressionSequence> ConstPtr;
+    };
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif