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diff --git a/bundles/org.simantics.db.common/src/org/simantics/db/common/request/MappedParts.java b/bundles/org.simantics.db.common/src/org/simantics/db/common/request/MappedParts.java
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+++ b/bundles/org.simantics.db.common/src/org/simantics/db/common/request/MappedParts.java
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+/*******************************************************************************
+ * 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.common.request;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.layer0.Layer0;
+import org.simantics.operation.Layer0X;
+
+/**
+ * Given an input resource that consists of resources representing other
+ * resources, return a map: represented resource -> representing resource.
+ * 
+ * @author Antti Villberg
+ */
+public class MappedParts extends ResourceRead<Map<Resource, Resource>> {
+
+    public MappedParts(Resource flat) {
+        super(flat);
+    }
+
+    @Override
+    public Map<Resource, Resource> perform(ReadGraph graph) throws DatabaseException {
+
+        Layer0 l0 = Layer0.getInstance(graph);
+        Layer0X L0X = Layer0X.getInstance(graph);
+        Map<Resource, Resource> result = new HashMap<Resource, Resource>();
+
+        for (Resource part : graph.getObjects(resource, l0.ConsistsOf)) {
+            Resource represents = graph.getPossibleObject(part, L0X.Represents);
+            if (represents != null)
+                result.put(represents, part);
+        }
+
+        return result;
+
+    }
+
+}