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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.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//
+//  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_DocumentFN_H
+#define Patternist_DocumentFN_H
+
+#include "qfunctioncall_p.h"
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+namespace QPatternist
+{
+
+    /**
+     * @short Implements XSL-T's function <tt>fn:document()</tt>.
+     *
+     * @c fn:document() has no evaluation functions, because it rewrites
+     * itself to a set of expressions that is the implementation.
+     *
+     * The two-argument version:
+     *
+     * <tt>document($uris as item()*, $baseURINode as node()) as node()*</tt>
+     *
+     * is rewritten into:
+     *
+     * <tt>for $uri in distinct-values($uris)
+     * return doc(resolve-uri($uri, base-uri($baseURINode)))</tt>
+     *
+     * and the single version argument:
+     *
+     * <tt>document($uris as item()*) as node()*</tt>
+     *
+     * is rewritten into:
+     *
+     * <tt>for $uri in distinct-values($uris)
+     * return doc($uri)</tt>
+     *
+     * The distinct-values() call ensures the node deduplication and sorting,
+     * although it fails in the case that URIs resolve/directs in some way to
+     * the same document. Some of those cases can be solved by wrapping the
+     * whole expression with a node deduplication(conceptually the-for-loop/.).
+     * One advantage with distinct-values() over generating traditional node
+     * sorting/deduplication code is that the latter contains node sorting
+     * which is uecessary and can be hard to analyze away. distinct-values()
+     * doesn't have this problem due to its narrower task..
+     *
+     * This works without problems, assuming XTRE1160 is not raised and that
+     * the recover action instead is ignore. In the case XTRE1160 is raised,
+     * one must cater for this.
+     *
+     * In addition to this, both signatures has its first argument changed to
+     * type <tt>xs:string*</tt>, in order to generate atomization code.
+     *
+     * One notable thing is that the expression for $baseURINode, is moved
+     * inside a loop, and will be evaluated repeatedly, unless moved out as
+     * part of optimization.
+     *
+     * @ingroup Patternist_functions
+     * @author Frans Englich <fenglich@trolltech.com>
+     * @since 4.5
+     */
+    class DocumentFN : public FunctionCall
+    {
+    public:
+        virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
+                                          const SequenceType::Ptr &reqType);
+    };
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif