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diff --git a/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/variable/VariableInterface.java b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/variable/VariableInterface.java
new file mode 100644
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+++ b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/variable/VariableInterface.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.db.layer0.variable;
+
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.exception.DatabaseException;
+
+public interface VariableInterface {
+	/*
+	 * @param uri A full variable URI
+	 */
+	Variable getVariable(ReadGraph graph, String uri);
+	/*
+	 * @param base a resource with URI
+	 * @param uri A relative variable URI
+	 */
+	Variable getVariable(ReadGraph graph, Resource base, String suffix);
+	Variable getVariable(ReadGraph graph, Resource variable);
+	/*
+	 * A context-dependent object which encodes a variable
+	 */
+	<T> Variable getVariable(ReadGraph graph, T context) throws DatabaseException;
+	<T> Variable getVariable(ReadGraph graph, Variable basedOn, T context) throws DatabaseException;
+	
+}