--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.core.databinding.observable/src/org/eclipse/core/internal/databinding/observable/tree/IHasChildrenUpdate.d	Tue Apr 21 10:55:51 2009 +0200
@@ -0,0 +1,37 @@
+/*******************************************************************************
+ * 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
+ *******************************************************************************/
+package org.eclipse.core.internal.databinding.observable.tree;
+
+/**
+ * Context sensitive update request for whether elements have children.
+ * 
+ * @since 3.3
+ */
+public interface IHasChildrenUpdate : IViewerUpdate {
+
+    /**
+     * The elements this request is for specified as tree paths. An empty path
+     * identifies the root element.
+     * 
+     * @return elements as tree paths
+     */
+    public TreePath[] getElements();
+
+    /**
+     * Sets whether the given element has children.
+     * 
+     * @param element
+     *            tree path to element, or empty for root element
+     * @param hasChildren
+     *            whether it has children
+     */
+    public void setHasChilren(TreePath element, bool hasChildren);
+}