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diff --git a/org.simantics.g3d/src/org/simantics/g3d/scenegraph/NodeMap.java b/org.simantics.g3d/src/org/simantics/g3d/scenegraph/NodeMap.java
new file mode 100644
index 00000000..d4f12da3
--- /dev/null
+++ b/org.simantics.g3d/src/org/simantics/g3d/scenegraph/NodeMap.java
@@ -0,0 +1,48 @@
+package org.simantics.g3d.scenegraph;
+
+import java.util.Collection;
+
+import org.simantics.g3d.scenegraph.base.INode;
+import org.simantics.g3d.scenegraph.base.NodeListener;
+import org.simantics.g3d.scenegraph.base.ParentNode;
+
+public interface NodeMap<T> {
+
+	public Collection<T> getRenderObjects(INode node);
+	
+	public void updateRenderObjectsFor(INode node);
+	
+	public INode getNode(T t);
+	
+	public ParentNode<IG3DNode> getRootNode();
+	
+	/**
+	 * Commit changes to the database.
+	 */
+	public void commit();
+	
+	
+	/**
+	 * Deletes (Disposes) the map. 
+	 */
+	public void delete();
+	
+	
+	/**
+	 * Track changes that are going to be committed into the database.
+	 * 
+	 * Disabling change tracking causes commit() to do nothing. 
+	 * @param enabled
+	 */
+	public void setChangeTracking(boolean enabled);
+	public boolean  isChangeTracking();
+	
+	
+	/**
+	 * Add listener for all scene-graph events.
+	 * @param listener
+	 */
+	public void addListener(NodeListener listener);
+	
+	public void removeListener(NodeListener listener);
+}