diff -r ec5d7af033d8 -r 2b18a72dcaf0 plcopen/structures.py
--- a/plcopen/structures.py	Wed Sep 19 15:20:59 2007 +0200
+++ b/plcopen/structures.py	Wed Sep 19 17:23:15 2007 +0200
@@ -270,6 +270,12 @@
         test = TypeHierarchy[test]
     return False
 
+def IsEndType(reference):
+    if reference is not None:
+        return len([typename for typename, parenttype in TypeHierarchy_list if parenttype == reference]) == 0
+    else:
+        return True
+
 """
 returns list of all types that correspont to the ANY* meta type
 """