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Concerning your KDM Ecore model: For example, Namespace.groupedElement() should return the children of all list attributes of Namespace and super types. Here, Namespace and super types have only one list attribute: Namespace.groupedCode. Thus, Namespace.groupedElement() should return the elements from Namespace.groupedCode() as well. If there are more list attributes in one class including its super types, then, as the union annotation says, the children of the list attributes must be merged and returned by groupedElement().