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Modified Files:
 	XMLSchema.py -- checking for wrong class in two methods.

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XMLSchema.py

@@ -488,10 +488,10 @@ class MarkerInterface:
         return isinstance(what, ModelGroupMarker)
 
     def isExtension(self, what):
-        return isinstance(what, ModelGroupMarker)
+        return isinstance(what, ExtensionMarker)
 
     def isRestriction(self, what):
-        return isinstance(what, ModelGroupMarker)
+        return isinstance(what, RestrictionMarker)
 
     def isSimple(self, what):
         return isinstance(what, SimpleMarker)