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diff --git a/Source/WebCore/css/CSSValue.h b/Source/WebCore/css/CSSValue.h
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+/*
+ * (C) 1999-2003 Lars Knoll (knoll@kde.org)
+ * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef CSSValue_h
+#define CSSValue_h
+
+#include "KURLHash.h"
+#include <wtf/ListHashSet.h>
+#include <wtf/RefPtr.h>
+
+namespace WebCore {
+
+class CSSStyleSheet;
+
+typedef int ExceptionCode;
+
+class CSSValue : public RefCounted<CSSValue> {
+public:
+    // FIXME: Change name to Type.
+    enum UnitTypes {
+        CSS_INHERIT = 0,
+        CSS_PRIMITIVE_VALUE = 1,
+        CSS_VALUE_LIST = 2,
+        CSS_CUSTOM = 3,
+        CSS_INITIAL = 4
+    };
+
+    virtual ~CSSValue() { }
+
+    // FIXME: Change this to return UnitTypes.
+    virtual unsigned short cssValueType() const { return CSS_CUSTOM; }
+
+    virtual String cssText() const = 0;
+    void setCssText(const String&, ExceptionCode&) { } // FIXME: Not implemented.
+
+    virtual bool isBorderImageValue() const { return false; }
+    virtual bool isCursorImageValue() const { return false; }
+    virtual bool isFontFamilyValue() const { return false; }
+    virtual bool isFontValue() const { return false; }
+    virtual bool isImageGeneratorValue() const { return false; }
+    virtual bool isImageValue() const { return false; }
+    virtual bool isImplicitInitialValue() const { return false; }
+    virtual bool isPrimitiveValue() const { return false; }
+    virtual bool isReflectValue() const { return false; }
+    virtual bool isShadowValue() const { return false; }
+    virtual bool isTimingFunctionValue() const { return false; }
+    virtual bool isValueList() const { return false; }
+    virtual bool isWebKitCSSTransformValue() const { return false; }
+
+#if ENABLE(SVG)
+    virtual bool isSVGColor() const { return false; }
+    virtual bool isSVGPaint() const { return false; }
+#endif
+
+    virtual void addSubresourceStyleURLs(ListHashSet<KURL>&, const CSSStyleSheet*) { }
+};
+
+} // namespace WebCore
+
+#endif // CSSValue_h