SMOF_ — Multiple ownership not in UML semantic subset

Section 10.1.1 (InstanceSpecification) has an operation getContainers with a postcondition returning potentially multiple instances linked at the owning end of composite associations. This is disallowed under UML semantics, making SMOF not a subset of UML semantically. Since SMOF is mainly concerned with multiple and dynamic classification, which does not affect issues of conflicting ownership (any more than multiple composite properties on a classifier do under the current MOF), it is not necessary for SMOF to address issues of ownership.