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diff --git a/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/domain/RelatedOrderedSetElementsAccessor.java b/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/domain/RelatedOrderedSetElementsAccessor.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.objmap.graph.rules.domain;
+
+import java.util.Collection;
+
+import org.apache.log4j.Logger;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.WriteGraph;
+import org.simantics.db.common.utils.OrderedSetUtils;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.objmap.exceptions.MappingException;
+
+/**
+ * Accesses the set of objects attached to the element by the given relation.
+ * @author Hannu Niemistö
+ */
+public class RelatedOrderedSetElementsAccessor implements IDomainAccessor<Resource, Collection<Resource>> {
+
+    static Logger LOGGER = Logger.getLogger("org.simantics.objmap");
+    
+	boolean deleteExtraObjects;
+
+	public RelatedOrderedSetElementsAccessor(boolean deleteExtraObjects) {
+        super();
+        this.deleteExtraObjects = deleteExtraObjects;
+    }
+
+    @Override
+	public Collection<Resource> get(ReadGraph g, Resource element) throws MappingException {
+		try {
+		    LOGGER.info("        RelatedOrderedSetElementsAccessor.get");
+			return OrderedSetUtils.toList(g, element);
+		} catch (DatabaseException e) {
+			throw new MappingException(e);
+		}
+	}
+	
+	@Override
+	public boolean set(WriteGraph g, Resource element, Collection<Resource> value)
+			throws MappingException {
+		try {
+		    LOGGER.info("        RelatedOrderedSetElementsAccessor.set");
+		    return OrderedSetUtils.set(g, element, value);
+		    // FIXME Implement deleteExtraObjects
+		} catch (DatabaseException e) {
+			throw new MappingException(e);
+		}
+		
+	}
+
+}