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   [C-8-1] The sourceType and targetType references may not refer to the same Classifier instance. 
   5-70 Common Warehouse Metamodel, v1.1 March 2003 
   context TypeMapping inv:self.sourceType <> self.targetType
   [C-8-2] A TypeSystem may own only Classifiers and TypeMappings. context TypeSystem inv:self.ownedElement->forAll( e | e.oclIsKindOf(Classifier) or
   e.oclIsKindOf(TypeMapping))