--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.core.databinding.observable/src/org/eclipse/core/internal/databinding/observable/tree/IChildrenUpdate.d	Tue Apr 21 10:55:51 2009 +0200
@@ -0,0 +1,53 @@
+/*******************************************************************************
+ * 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 children update request for a parent and subrange of its
+ * children.
+ *  
+ * @since 3.3
+ */
+public interface IChildrenUpdate : IViewerUpdate {
+
+    /**
+     * Returns the parent element that children are being requested for
+     * as a tree path. An empty path identifies the root element.
+     * 
+     * @return parent element as a tree path
+     */
+    public TreePath getParent();
+    
+    /**
+     * Returns the offset at which children have been requested for. This is
+     * the index of the first child being requested.
+     * 
+     * @return offset at which children have been requested for
+     */
+    public int getOffset();
+    
+    /**
+     * Returns the number of children requested.
+     * 
+     * @return number of children requested
+     */
+    public int getLength();
+    
+    /**
+     * Sets the child for this request's parent at the given offset.
+     * 
+     * @param child child
+     * @param index child offset
+     * 
+     * TODO: what to do with <code>null</code>
+     */
+    public void setChild(Object child, int index);  
+}