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diff --git a/Source/WebCore/css/CSSNamespace.h b/Source/WebCore/css/CSSNamespace.h
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+++ b/Source/WebCore/css/CSSNamespace.h
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+/*
+ * Copyright (C) 1999-2003 Lars Knoll (knoll@kde.org)
+ *               1999 Waldo Bastian (bastian@kde.org)
+ * Copyright (C) 2004, 2006, 2010 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 CSSNamespace_h
+#define CSSNamespace_h
+
+#include <wtf/text/AtomicString.h>
+
+namespace WebCore {
+
+    struct CSSNamespace : Noncopyable {
+        AtomicString prefix;
+        AtomicString uri;
+        OwnPtr<CSSNamespace> parent;
+
+        CSSNamespace(const AtomicString& prefix, const AtomicString& uri, PassOwnPtr<CSSNamespace> parent)
+            : prefix(prefix)
+            , uri(uri)
+            , parent(parent)
+        {
+        }
+
+        CSSNamespace* namespaceForPrefix(const AtomicString& prefix)
+        {
+            for (CSSNamespace* candidate = this; candidate; candidate = candidate->parent.get()) {
+                if (candidate->prefix == prefix)
+                    return candidate;
+            }
+            return 0;
+        }
+    };
+
+} // namespace WebCore
+
+#endif // CSSNamespace_h