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diff --git a/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/adapter/impl/RootParentSubgraphExtent.java b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/adapter/impl/RootParentSubgraphExtent.java
new file mode 100644
index 000000000..f611fbcd7
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+++ b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/adapter/impl/RootParentSubgraphExtent.java
@@ -0,0 +1,45 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * 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:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.db.layer0.adapter.impl;
+
+import org.simantics.db.AsyncReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.Statement;
+import org.simantics.db.procedure.AsyncProcedure;
+import org.simantics.layer0.Layer0;
+
+public class RootParentSubgraphExtent extends TypeSubgraphExtent {
+
+	public static boolean DEBUG = false;
+	
+	final private Classifier classifier;
+	
+	public RootParentSubgraphExtent(final Resource root) {
+		this.classifier = new Classifier() {
+
+			@Override
+			public void classify(AsyncReadGraph graph, Statement statement, ExtentStatus objectExtent, Callback callback) {
+				if(!root.equals(statement.getSubject())) return;
+				if(!graph.getService(Layer0.class).PartOf.equals(statement.getPredicate())) return;
+				if(!ExtentStatus.EXTERNAL.equals(objectExtent)) return;
+				callback.statement(statement, true); 
+			}
+			
+		};
+	}
+
+	@Override
+	public void accept(AsyncReadGraph graph, final Resource resource, final AsyncProcedure<Classifier> procedure, final Callback callback) {
+		procedure.execute(graph, classifier);
+	}
+
+}