--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.core.databinding/src/org/eclipse/core/internal/databinding/observable/tree/IObservableTree.d	Tue Apr 14 11:35:29 2009 +0200
@@ -0,0 +1,147 @@
+/*******************************************************************************
+ * 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.IObservableTree;
+
+import java.lang.all;
+
+import org.eclipse.core.databinding.observable.IObservable;
+
+/**
+ * 
+ * A tree whose changes can be tracked by tree change listeners. If the tree is
+ * ordered ({@link #isOrdered()}), the order of children for a given tree path
+ * matters, and tree change notifications will always specify indices. If the
+ * tree is unordered, the children of a tree path are an unordered set and
+ * indices in change notifications are not specified.
+ * 
+ * <p>
+ * This interface is not intended to be implemented by clients. Clients should
+ * instead subclass one of the framework classes that implement this interface.
+ * Note that direct implementers of this interface outside of the framework will
+ * be broken in future releases when methods are added to this interface.
+ * </p>
+ * 
+ * @since 1.1
+ */
+public interface IObservableTree : IObservable {
+    
+    /**
+     * Element that can be returned from synchronous getters if this observable
+     * tree is lazy.
+     */
+    public final static Object UNKNOWN_ELEMENT = new Object();
+    
+    /**
+     * @param listener
+     */
+    public void addTreeChangeListener(ITreeChangeListener listener);
+
+    /**
+     * @param listener
+     */
+    public void removeTreeChangeListener(ITreeChangeListener listener);
+
+    /**
+     * Returns whether the order of children for a given parent is important. If
+     * this tree is ordered, tree change notifications will always specify
+     * indices.
+     * 
+     * @return true if the order of children for a given parent is important
+     */
+    public bool isOrdered();
+    
+    /**
+     * Returns whether this tree is optimized to fetch subsets of children
+     * lazily and possibly asynchronously. Implies {@link #isOrdered()}.
+     * 
+     * @return true if this tree 
+     */
+    public bool isLazy();
+
+    /**
+     * @param parentPath
+     * @return the children at the given parent path
+     */
+    public Object[] getChildren(TreePath parentPath);
+    
+    /**
+     * @param parentPath
+     * @param children
+     */
+    public void setChildren(TreePath parentPath, Object[] children);
+    
+    /**
+     * @param parentPath
+     * @param childElement
+     */
+    public void addChild(TreePath parentPath, Object childElement);
+    
+    /**
+     * @param parentPath
+     * @param childElement 
+     */
+    public void removeChild(TreePath parentPath, Object childElement);
+    
+    /**
+     * @param parentPath
+     * @param index
+     * @param childElement
+     */
+    public void insertChild(TreePath parentPath, int index, Object childElement);
+    
+    /**
+     * @param parentPath
+     * @param index
+     */
+    public void removeChild(TreePath parentPath, int index);
+    
+    /**
+     * @param parentPath
+     * @return <code>true</code> if the element at the given path has children
+     */
+    public bool hasChildren(TreePath parentPath);
+    
+    /**
+     * @param parentPath
+     * @return the number of children of the element at the given path 
+     */
+    public int getChildCount(TreePath parentPath);
+    
+    /**
+     * @param parentPath
+     * @param count
+     */
+    public void setChildCount(TreePath parentPath, int count);
+    
+    /**
+     * Updates the number of children for the given parent elements in the
+     * specified request.
+     * 
+     * @param update specifies counts to update and stores result
+     */
+    public void updateChildrenCount(IChildrenCountUpdate update);
+    
+    /**
+     * Updates children as requested by the update.
+     * 
+     * @param update specifies children to update and stores result
+     */ 
+    public void updateChildren(IChildrenUpdate update);
+    
+    /**
+     * Updates whether elements have children.
+     * 
+     * @param update specifies elements to update and stores result
+     */
+    public void updateHasChildren(IHasChildrenUpdate update);
+
+}