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diff --git a/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/ChildrenByIdentifier.java b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/ChildrenByIdentifier.java
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+++ b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/ChildrenByIdentifier.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.layer0.request;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.simantics.datatypes.literal.GUID;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.common.request.ResourceRead;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.layer0.Layer0;
+
+/**
+ * Get a map from GUIDs to the children of the given resource.
+ */
+public final class ChildrenByIdentifier extends ResourceRead<Map<GUID, Resource>> {
+	public ChildrenByIdentifier(Resource resource) {
+		super(resource);
+	}
+
+	@Override
+	public Map<GUID, Resource> perform(ReadGraph graph) throws DatabaseException {
+		Map<GUID, Resource> result = new HashMap<>();
+		Layer0 L0 = Layer0.getInstance(graph);
+		Collection<Resource> children = graph.getObjects(resource, L0.ConsistsOf);
+		for (Resource child : children) {
+			GUID guid = graph.getPossibleRelatedValue(child, L0.identifier, GUID.BINDING);
+			if (guid != null)
+				result.put(guid, child);
+		}
+		
+		return result;
+	}
+}