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diff --git a/Source/WebCore/xml/XMLTreeViewer.h b/Source/WebCore/xml/XMLTreeViewer.h
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+++ b/Source/WebCore/xml/XMLTreeViewer.h
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+/*
+ * Copyright (C) 2011 Google Inc. All rights reserved.
+ *
+ * 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 GOOGLE INC. AND ITS CONTRIBUTORS
+ * “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 GOOGLE INC.
+ * OR ITS CONTRIBUTORS 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 XMLTreeViewer_h
+#define XMLTreeViewer_h
+
+#include <wtf/Vector.h>
+#include <wtf/text/WTFString.h>
+
+#if ENABLE(XSLT)
+
+namespace WebCore {
+
+class Document;
+class ProcessingInstruction;
+
+class XMLTreeViewer {
+public:
+    explicit XMLTreeViewer(Document*);
+    virtual ~XMLTreeViewer() {};
+
+    bool hasNoStyleInformation() const;
+    void transformDocumentToTreeView();
+
+private:
+    Document* m_document;
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(XSLT)
+#endif // XMLTreeViewer_h