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diff --git a/org.simantics.objmap2/src/org/simantics/objmap/graph/impl/Link.java b/org.simantics.objmap2/src/org/simantics/objmap/graph/impl/Link.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.impl;
+
+import org.simantics.objmap.graph.schema.ILinkType;
+
+
+/**
+ * An indication that the domain element corresponds to the range element
+ * in the mapping. The link type describes how source and target objects
+ * are updated. There are additionally flags for dirtiness of the link.
+ * @author Hannu Niemistö
+ */
+public class Link<Domain,Range> {
+	public ILinkType<Domain,Range> type;
+	public Domain domainElement;
+	public Range rangeElement;
+	
+	public boolean domainModified = false;
+	public boolean rangeModified = false;
+	public boolean removed = false;
+	
+	public Link(ILinkType<Domain,Range> type, Domain domainElement, Range rangeElement) {
+		this.type = type;
+		this.domainElement = domainElement;
+		this.rangeElement = rangeElement;		
+	}		
+}
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