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diff --git a/org.simantics.objmap2/src/org/simantics/objmap/graph/schema/IMappingSchema.java b/org.simantics.objmap2/src/org/simantics/objmap/graph/schema/IMappingSchema.java
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+++ b/org.simantics.objmap2/src/org/simantics/objmap/graph/schema/IMappingSchema.java
@@ -0,0 +1,31 @@
+/*******************************************************************************
+ * 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.schema;
+
+import org.simantics.db.ReadGraph;
+import org.simantics.objmap.exceptions.MappingException;
+
+/**
+ * Specifies the link types of new elements added to a mapping.
+ * @author Hannu Niemistö
+ */
+public interface IMappingSchema<Domain,Range> {
+    /**
+     * @return Link type that should be used for the element.
+     */
+	ILinkType<Domain,Range> linkTypeOfDomainElement(ReadGraph g, Domain element) throws MappingException;
+	
+	/**
+     * @return Link type that should be used for the element.
+     */
+	ILinkType<Domain,Range> linkTypeOfRangeElement(Range element) throws MappingException;
+}