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diff --git a/bundles/org.simantics.objmap2/src/org/simantics/objmap/structural/rules/domain/RelatedObjectsAccessor.java b/bundles/org.simantics.objmap2/src/org/simantics/objmap/structural/rules/domain/RelatedObjectsAccessor.java
new file mode 100644
index 000000000..c56ffb6d1
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+++ b/bundles/org.simantics.objmap2/src/org/simantics/objmap/structural/rules/domain/RelatedObjectsAccessor.java
@@ -0,0 +1,113 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2013 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.structural.rules.domain;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
+import org.apache.log4j.Logger;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.WriteGraph;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.objmap.exceptions.MappingException;
+import org.simantics.objmap.graph.rules.domain.IDomainAccessor;
+import org.simantics.objmap.graph.rules.domain.MappingUtils;
+import org.simantics.objmap.structural.StructuralResource;
+
+
+public class RelatedObjectsAccessor implements IDomainAccessor<StructuralResource,Collection<StructuralResource>> {
+
+    static Logger LOGGER = Logger.getLogger("org.simantics.objmap");
+    
+	Resource relation;
+	boolean deleteExtraObjects;
+	boolean useTypeResource;
+	
+	private boolean preventStructuralChanges = true;
+	private boolean preventStructuralRootChanges = true;
+
+	public RelatedObjectsAccessor(Resource relation, boolean deleteExtraObjects, boolean useTypeResource) {
+        super();
+        this.relation = relation;
+        this.deleteExtraObjects = deleteExtraObjects;
+        this.useTypeResource = useTypeResource;
+    }
+	
+	public RelatedObjectsAccessor(Resource relation, boolean deleteExtraObjects, boolean useTypeResource, boolean preventStructuralChanges, boolean preventStructuralRootChanges) {
+        super();
+        this.relation = relation;
+        this.deleteExtraObjects = deleteExtraObjects;
+        this.useTypeResource = useTypeResource;
+		this.preventStructuralChanges = preventStructuralChanges;
+		this.preventStructuralRootChanges = preventStructuralRootChanges;
+    }
+
+    @Override
+	public Collection<StructuralResource> get(ReadGraph g, StructuralResource element) throws MappingException {
+		try {
+		    LOGGER.info("        RelatedObjectsAccessor.get");
+			
+		   
+		    Resource res = getServiceResource(g, element);
+		    if (res == null)
+		    	return Collections.emptyList();
+		    Collection<Resource> coll = g.getObjects(res, relation);
+			List<StructuralResource> result = new ArrayList<StructuralResource>(coll.size());
+			for (Resource r : coll) {
+				if (StructuralUtils.isStructuralInstance(g, r)) {
+					result.add(new StructuralResource(g, r, element.getContext(),r));
+				} else {
+					result.add(new StructuralResource(g, r, element.getContext()));
+				}
+			}
+			return result;
+		} catch (DatabaseException e) {
+			throw new MappingException(e);
+		}
+	}
+    
+    private boolean preventChange(StructuralResource element) {
+    	return preventStructuralChanges && element.isStructural() && (!element.isStructuralRoot()||preventStructuralRootChanges);	
+    }
+	
+	@Override
+	public boolean set(WriteGraph g, StructuralResource element, Collection<StructuralResource> value)
+			throws MappingException {
+		try {
+		    LOGGER.info("        RelatedObjectsAccessor.set");
+		    Resource res = getServiceResource(g, element);
+		    if (res == null)
+		    	return false;
+		    if (preventChange(element))
+				return false;
+		    Resource[] arr = new Resource[value.size()];
+		    int i = 0; 
+		    for (StructuralResource sr : value) {
+		    	arr[i++] = sr.getResource();
+		    }
+			return MappingUtils.synchronizeStatements(g, res, relation, 
+			        arr, deleteExtraObjects);
+		} catch (DatabaseException e) {
+			throw new MappingException(e);
+		}
+		
+	}
+
+	private Resource getServiceResource(ReadGraph g, StructuralResource element) {
+		if (!useTypeResource)
+			return element.getResource();
+		return element.getTypeResource();
+	}
+}