BACM — Import SMM and specialize some SMM classes for integration

The specification displays classes with SMM:: namespace designations, but the model does not explicitly import SMM and it does not explicitly specialize the corresponding SMM metaclasses. By formally importing SMM, the BACM metamodel would be coupled with a particular version of SMM and would have to be revised to accommodate integration with other versions of SMM. On the other hand, the current normative text may not be sufficiently precise to allow an implementer to create a conforming implementation of this integration.