KERML — validateAssociationStructureIntersection seems vacuous

The documentation for the validateAssociationStructureIntersection constraint is "If an Association is also a kind of Structure, then it must be an AssociationStructure." with the OCL

oclIsKindOf(Structure) = oclIsKindOf(AssociationStructure)

However, this is really a constraint on the abstract syntax, not user models. Since the current abstract syntax does not have any metaclass that is a subclass of both Structure and Association other than AssociationStructure, this constraint will always be true for every user model. (And, if the abstract syntax did include another subclass of both Structure and Association, then constraint would then be violated by every user model that used that construct!)