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diff --git a/Source/WebCore/xml/XPathExpressionNode.h b/Source/WebCore/xml/XPathExpressionNode.h
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+++ b/Source/WebCore/xml/XPathExpressionNode.h
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+/*
+ * Copyright (C) 2005 Frerich Raabe <raabe@kde.org>
+ * Copyright (C) 2006, 2009 Apple Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef XPathExpressionNode_h
+#define XPathExpressionNode_h
+
+#if ENABLE(XPATH)
+
+#include "Node.h"
+#include "XPathValue.h"
+#include <wtf/HashMap.h>
+#include <wtf/Vector.h>
+#include <wtf/text/StringHash.h>
+
+namespace WebCore {
+
+    namespace XPath {
+        
+        struct EvaluationContext : FastAllocBase {
+            RefPtr<Node> node;
+            unsigned long size;
+            unsigned long position;
+            HashMap<String, String> variableBindings;
+
+            bool hadTypeConversionError;
+        };
+
+        class ParseNode {
+        public:
+            virtual ~ParseNode() { }
+        };
+
+        class Expression : public ParseNode, public Noncopyable {
+        public:
+            static EvaluationContext& evaluationContext();
+
+            Expression();
+            virtual ~Expression();
+
+            virtual Value evaluate() const = 0;
+
+            void addSubExpression(Expression* expr)
+            {
+                m_subExpressions.append(expr);
+                m_isContextNodeSensitive |= expr->m_isContextNodeSensitive;
+                m_isContextPositionSensitive |= expr->m_isContextPositionSensitive;
+                m_isContextSizeSensitive |= expr->m_isContextSizeSensitive;
+            }
+
+            bool isContextNodeSensitive() const { return m_isContextNodeSensitive; }
+            bool isContextPositionSensitive() const { return m_isContextPositionSensitive; }
+            bool isContextSizeSensitive() const { return m_isContextSizeSensitive; }
+            void setIsContextNodeSensitive(bool value) { m_isContextNodeSensitive = value; }
+            void setIsContextPositionSensitive(bool value) { m_isContextPositionSensitive = value; }
+            void setIsContextSizeSensitive(bool value) { m_isContextSizeSensitive = value; }
+
+            virtual Value::Type resultType() const = 0;
+
+        protected:
+            unsigned subExprCount() const { return m_subExpressions.size(); }
+            Expression* subExpr(unsigned i) { return m_subExpressions[i]; }
+            const Expression* subExpr(unsigned i) const { return m_subExpressions[i]; }
+
+        private:
+            Vector<Expression*> m_subExpressions;
+
+            // Evaluation details that can be used for optimization.
+            bool m_isContextNodeSensitive;
+            bool m_isContextPositionSensitive;
+            bool m_isContextSizeSensitive;
+        };
+
+    }
+
+}
+
+#endif // ENABLE(XPATH)
+
+#endif // EXPRESSION_H
+