+import java.util.ArrayList;
+import java.util.regex.Pattern;
+
+import org.simantics.graph.query.Path;
+import org.simantics.graph.query.PathChild;
+import org.simantics.graph.query.PathRoot;
+import org.simantics.graph.representation.External;
+import org.simantics.graph.representation.Identity;
+import org.simantics.graph.representation.Internal;
+import org.simantics.graph.representation.Optional;
+import org.simantics.graph.representation.Root;
+