UMLR — UML: Cross model dependencies

There seems to be some confusion in the UML spec and by users about the applicability of run-time UML visibility/navigability rules to model time, some of the typical assumptions do not work with distributed models. This needs to be cleared up. For example, can a tool transverse a dependency that crosses models. Can a tool transverse the reverse direction?

These need to be solved in a way that is internally consistent and consistent with distributed/federated models