diff -r b486794d160d -r 33abf479f202 src/share/classes/com/sun/source/doctree/DocTreeVisitor.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/classes/com/sun/source/doctree/DocTreeVisitor.java	Wed Nov 14 17:23:10 2012 -0800
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code 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 General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package com.sun.source.doctree;
+
+
+/**
+ * A visitor of trees, in the style of the visitor design pattern.
+ * Classes implementing this interface are used to operate
+ * on a tree when the kind of tree is unknown at compile time.
+ * When a visitor is passed to an tree's {@link DocTree#accept
+ * accept} method, the <tt>visit<i>XYZ</i></tt> method most applicable
+ * to that tree is invoked.
+ *
+ * <p> Classes implementing this interface may or may not throw a
+ * {@code NullPointerException} if the additional parameter {@code p}
+ * is {@code null}; see documentation of the implementing class for
+ * details.
+ *
+ * <p> <b>WARNING:</b> It is possible that methods will be added to
+ * this interface to accommodate new, currently unknown, doc comment
+ * structures added to future versions of the Java&trade; programming
+ * language.  Therefore, visitor classes directly implementing this
+ * interface may be source incompatible with future versions of the
+ * platform.
+ *
+ * @param <R> the return type of this visitor's methods.  Use {@link
+ *            Void} for visitors that do not need to return results.
+ * @param <P> the type of the additional parameter to this visitor's
+ *            methods.  Use {@code Void} for visitors that do not need an
+ *            additional parameter.
+ *
+ * @since 1.8
+ */
+public interface DocTreeVisitor<R,P> {
+    R visitAttribute(AttributeTree node, P p);
+    R visitAuthor(AuthorTree node, P p);
+    R visitComment(CommentTree node, P p);
+    R visitDeprecated(DeprecatedTree node, P p);
+    R visitDocComment(DocCommentTree node, P p);
+    R visitDocRoot(DocRootTree node, P p);
+    R visitEndElement(EndElementTree node, P p);
+    R visitEntity(EntityTree node, P p);
+    R visitErroneous(ErroneousTree node, P p);
+    R visitIdentifier(IdentifierTree node, P p);
+    R visitInheritDoc(InheritDocTree node, P p);
+    R visitLink(LinkTree node, P p);
+    R visitLiteral(LiteralTree node, P p);
+    R visitParam(ParamTree node, P p);
+    R visitReference(ReferenceTree node, P p);
+    R visitReturn(ReturnTree node, P p);
+    R visitSee(SeeTree node, P p);
+    R visitSerial(SerialTree node, P p);
+    R visitSerialData(SerialDataTree node, P p);
+    R visitSerialField(SerialFieldTree node, P p);
+    R visitSince(SinceTree node, P p);
+    R visitStartElement(StartElementTree node, P p);
+    R visitText(TextTree node, P p);
+    R visitThrows(ThrowsTree node, P p);
+    R visitUnknownBlockTag(UnknownBlockTagTree node, P p);
+    R visitUnknownInlineTag(UnknownInlineTagTree node, P p);
+    R visitValue(ValueTree node, P p);
+    R visitVersion(VersionTree node, P p);
+    R visitOther(DocTree node, P p);
+}