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diff --git a/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/MappedElementRule.java b/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/MappedElementRule.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;
+
+import org.apache.log4j.Logger;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.WriteGraph;
+import org.simantics.objmap.backward.IBackwardMapping;
+import org.simantics.objmap.bidirectional.IBidirectionalMappingRule;
+import org.simantics.objmap.exceptions.MappingException;
+import org.simantics.objmap.forward.IForwardMapping;
+import org.simantics.objmap.graph.rules.domain.IDomainAccessor;
+import org.simantics.objmap.graph.rules.range.IRangeAccessor;
+
+
+
+
+/**
+ * A rule that synchronizes collection of elements between
+ * domain and range accessors. Elements are mapped from
+ * between domain and range during the synchronization.
+ * @author Hannu Niemistö
+ */
+public class MappedElementRule<Domain, Range> implements IBidirectionalMappingRule<Domain, Range> {
+    
+    static Logger LOGGER = Logger.getLogger("org.simantics.objmap");
+    
+	IDomainAccessor<Domain,Domain> domainAccessor;
+	IRangeAccessor<Range,Range> rangeAccessor;
+	
+	public MappedElementRule(IDomainAccessor<Domain,Domain> domainAccessor,
+            IRangeAccessor<Range,Range> rangeAccessor) {
+        this.domainAccessor = domainAccessor;
+        this.rangeAccessor = rangeAccessor;
+    }
+
+    @Override
+	public boolean updateDomain(WriteGraph g, IBackwardMapping<Domain, Range> map,
+			Domain domainElement, Range rangeElement)
+			throws MappingException {
+        LOGGER.info("    MappedElementRule.updateDomain");
+	    Range value = rangeAccessor.get(rangeElement);
+	    Domain mappedValue = value == null ? null : map.inverseMap(g, value);//map.inverseGet(value);
+		return domainAccessor.set(g, domainElement, mappedValue);
+	}
+
+	@Override
+	public boolean updateRange(ReadGraph g, IForwardMapping<Domain, Range> map,
+			Domain domainElement, Range rangeElement)
+			throws MappingException {
+        LOGGER.info("    MappedElementRule.updateRange");   
+	    Domain value = domainAccessor.get(g, domainElement);
+        Range mappedValue = value == null ? null : map.map(g, value);////map.get(value);
+        return rangeAccessor.set(rangeElement, mappedValue);
+	}	
+	
+	public void createDomain(WriteGraph g, IBackwardMapping<Domain,Range> map, Domain domainElement, Range rangeElement) throws MappingException {
+		updateDomain(g, map, domainElement, rangeElement);
+	};
+	
+	public void createRange(ReadGraph g, IForwardMapping<Domain,Range> map, Domain domainElement, Range rangeElement) throws MappingException {
+		updateRange(g, map, domainElement, rangeElement);
+	};
+}