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diff --git a/Source/WebCore/css/CSSRule.h b/Source/WebCore/css/CSSRule.h
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+/*
+ * (C) 1999-2003 Lars Knoll (knoll@kde.org)
+ * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
+ * Copyright (C) 2002, 2006, 2007 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 CSSRule_h
+#define CSSRule_h
+
+#include "CSSStyleSheet.h"
+#include "KURLHash.h"
+#include <wtf/ListHashSet.h>
+
+namespace WebCore {
+
+typedef int ExceptionCode;
+
+enum CSSRuleFilter {
+    AllCSSRules,
+    SameOriginCSSRulesOnly
+}; 
+
+class CSSRule : public StyleBase {
+public:
+    // FIXME: Change name to Type.
+    enum CSSRuleType {
+        UNKNOWN_RULE,
+        STYLE_RULE,
+        CHARSET_RULE,
+        IMPORT_RULE,
+        MEDIA_RULE,
+        FONT_FACE_RULE,
+        PAGE_RULE,
+        // 7 used to be VARIABLES_RULE
+        WEBKIT_KEYFRAMES_RULE = 8,
+        WEBKIT_KEYFRAME_RULE
+    };
+
+    // FIXME: Change to return CSSRuleType.
+    virtual unsigned short type() const = 0;
+
+    CSSStyleSheet* parentStyleSheet() const;
+    CSSRule* parentRule() const;
+
+    virtual String cssText() const = 0;
+    void setCssText(const String&, ExceptionCode&);
+
+    virtual void addSubresourceStyleURLs(ListHashSet<KURL>&) { }
+
+protected:
+    CSSRule(CSSStyleSheet* parent)
+        : StyleBase(parent)
+    {
+    }
+
+private:
+    virtual bool isRule() { return true; }
+};
+
+} // namespace WebCore
+
+#endif // CSSRule_h