Describe how UML package dependencies are handled

[rob-metalinkage]

XMI is package centric, so XMI reuse must mirror UML package dependencies.

In an ecosystem with many UML packages (e.g. INSPIRE) dependency management is a real problem, since UML has internal UUIDs but no way is provided for resolving these (or often even exposing them) to locate dependencies.

There may be a relationship between this and the merge-xmi but its not clear.

Also, if the tool doesnt require dependencies, because it assumes that it will owl:import each depdendent ontology and this is sufficient (?) this should also be explicit.