--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.core.databinding/src/org/eclipse/core/internal/databinding/observable/tree/TreeDiff.d	Tue Apr 14 11:35:29 2009 +0200
@@ -0,0 +1,41 @@
+/*******************************************************************************
+ * Copyright (c) 2006, 2007 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+
+module org.eclipse.core.internal.databinding.observable.tree.TreeDiff;
+
+import java.lang.all;
+
+/**
+ * Describes the difference between two trees as a tree of tree diff nodes.
+ * 
+ * @since 1.1
+ * 
+ */
+public abstract class TreeDiff : TreeDiffNode {
+
+    /**
+     * Returns the tree path (possibly empty) of the parent, or
+     * <code>null</code> if the underlying tree is not lazy and never contains
+     * duplicate elements.
+     * 
+     * @return the tree path (possibly empty) of the unchanged parent, or
+     *         <code>null</code>
+     */
+    public abstract TreePath getParentPath();
+
+    /**
+     * @param visitor
+     */
+    public void accept(TreeDiffVisitor visitor) {
+        doAccept(visitor, getParentPath());
+    }
+
+}