--- /dev/null
+package org.simantics.graph.representation;\r
+\r
+import org.simantics.databoard.annotations.Union;\r
+\r
+@Union({\r
+ Root.class,\r
+ External.class,\r
+ Optional.class,\r
+ Internal.class\r
+})\r
+public interface IdentityDefinition {\r
+}\r