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diff --git a/bundles/org.simantics.objmap2/src/org/simantics/objmap/structural/annotations/factories/OptionalRelatedElementsRuleFactory.java b/bundles/org.simantics.objmap2/src/org/simantics/objmap/structural/annotations/factories/OptionalRelatedElementsRuleFactory.java
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index 000000000..734b3cd79
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+++ b/bundles/org.simantics.objmap2/src/org/simantics/objmap/structural/annotations/factories/OptionalRelatedElementsRuleFactory.java
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+/*******************************************************************************
+ * 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.annotations.factories;
+
+import java.lang.annotation.Annotation;
+import java.lang.reflect.Field;
+import java.util.Collection;
+import java.util.Collections;
+
+import org.simantics.db.ReadGraph;
+import org.simantics.db.exception.ResourceNotFoundException;
+import org.simantics.db.exception.ServiceException;
+import org.simantics.db.exception.ValidationException;
+import org.simantics.objmap.bidirectional.IBidirectionalMappingRule;
+import org.simantics.objmap.graph.annotations.OptionalRelatedElements;
+import org.simantics.objmap.graph.rules.MappedElementsRule;
+import org.simantics.objmap.structural.rules.domain.RelatedObjectsAccessor;
+import org.simantics.objmap.graph.rules.factory.IFieldRuleFactory;
+import org.simantics.objmap.graph.rules.range.FieldAccessorWithDefault;
+import org.simantics.objmap.structural.StructuralResource;
+
+
+public class OptionalRelatedElementsRuleFactory<Range> implements IFieldRuleFactory<StructuralResource, Range> {
+
+    @Override
+    public IBidirectionalMappingRule<StructuralResource, Range> create(ReadGraph g, Annotation _annotation, Field field) throws ResourceNotFoundException, ValidationException, ServiceException {
+        OptionalRelatedElements annotation = (OptionalRelatedElements)_annotation;
+        return new MappedElementsRule<StructuralResource, Range>(
+                new RelatedObjectsAccessor(g.getResource(annotation.value()),
+                        annotation.composition(),false),
+                new FieldAccessorWithDefault<Range,Collection<Range>>(field, Collections.<Range>emptyList())
+                );
+    }
+
+}