diff -r 779a519f78f2 -r acef952101a5 plcopen/plcopen.py
--- a/plcopen/plcopen.py	Thu Dec 10 16:37:11 2009 +0100
+++ b/plcopen/plcopen.py	Sat Dec 12 20:37:35 2009 +0100
@@ -649,10 +649,12 @@
     setattr(cls, "GetCustomBlockResource", GetCustomBlockResource)
 
     # Return Data Types checking for recursion
-    def GetCustomDataTypes(self, exclude = ""):
+    def GetCustomDataTypes(self, exclude = "", complextypes = True):
         customdatatypes = []
         for customdatatype in self.getdataTypes():
             customdatatype_name = customdatatype.getname()
+            if not complextypes and customdatatype.baseType.getcontent()["name"] in ["array", "struct"]:
+                continue
             if customdatatype_name != exclude and not self.ElementIsUsedBy(exclude, customdatatype_name):
                 customdatatypes.append(customdatatype_name)
         return customdatatypes