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diff --git a/WebCore/editing/visible_units.h b/WebCore/editing/visible_units.h
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+/*
+ * Copyright (C) 2004 Apple Computer, 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 APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. OR
+ * 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 visible_units_h
+#define visible_units_h
+
+#include "Document.h"
+#include "TextAffinity.h"
+
+namespace WebCore {
+
+class VisiblePosition;
+
+enum EWordSide { RightWordIfOnBoundary = false, LeftWordIfOnBoundary = true };
+
+// words
+VisiblePosition startOfWord(const VisiblePosition &, EWordSide = RightWordIfOnBoundary);
+VisiblePosition endOfWord(const VisiblePosition &, EWordSide = RightWordIfOnBoundary);
+VisiblePosition previousWordPosition(const VisiblePosition &);
+VisiblePosition nextWordPosition(const VisiblePosition &);
+
+// sentences
+VisiblePosition startOfSentence(const VisiblePosition &);
+VisiblePosition endOfSentence(const VisiblePosition &);
+VisiblePosition previousSentencePosition(const VisiblePosition &);
+VisiblePosition nextSentencePosition(const VisiblePosition &);
+
+// lines
+VisiblePosition startOfLine(const VisiblePosition &);
+VisiblePosition endOfLine(const VisiblePosition &);
+VisiblePosition previousLinePosition(const VisiblePosition &, int x);
+VisiblePosition nextLinePosition(const VisiblePosition &, int x);
+bool inSameLine(const VisiblePosition &, const VisiblePosition &);
+bool isStartOfLine(const VisiblePosition &);
+bool isEndOfLine(const VisiblePosition &);
+
+// paragraphs (perhaps a misnomer, can be divided by line break elements)
+VisiblePosition startOfParagraph(const VisiblePosition&);
+VisiblePosition endOfParagraph(const VisiblePosition&);
+VisiblePosition startOfNextParagraph(const VisiblePosition&);
+VisiblePosition previousParagraphPosition(const VisiblePosition &, int x);
+VisiblePosition nextParagraphPosition(const VisiblePosition &, int x);
+bool inSameParagraph(const VisiblePosition &, const VisiblePosition &);
+bool isStartOfParagraph(const VisiblePosition &);
+bool isEndOfParagraph(const VisiblePosition &);
+
+// blocks (true paragraphs; line break elements don't break blocks)
+VisiblePosition startOfBlock(const VisiblePosition &);
+VisiblePosition endOfBlock(const VisiblePosition &);
+bool inSameBlock(const VisiblePosition &, const VisiblePosition &);
+bool isStartOfBlock(const VisiblePosition &);
+bool isEndOfBlock(const VisiblePosition &);
+
+// document
+VisiblePosition startOfDocument(const Node*);
+VisiblePosition endOfDocument(const Node*);
+VisiblePosition startOfDocument(const VisiblePosition &);
+VisiblePosition endOfDocument(const VisiblePosition &);
+bool inSameDocument(const VisiblePosition &, const VisiblePosition &);
+bool isStartOfDocument(const VisiblePosition &);
+bool isEndOfDocument(const VisiblePosition &);
+
+// editable content
+VisiblePosition startOfEditableContent(const VisiblePosition&);
+VisiblePosition endOfEditableContent(const VisiblePosition&);
+
+} // namespace WebCore
+
+#endif // VisiblePosition_h