As a convenience for UML modelers or modelers using other profiles, a profile for MVF would allow UML tool users to apply MVF without requiring other changes to tools.

This would require both the profile itself as a machine readable file and documentation for it in the MVF specification. An optional compliance point should be added to cover the new profile.

The terms may be confusing, and implementers may 'misplace' important pieces of information

'uri' is meant to be an 'individual/instance' URI, that identifies the entity represented by the MVF element
(e.g. an individual Community - mapped by a mvf:Community, or an individual Concept - mapped by a mvf:MVFEntry)

'externalReference', which only applies to MVFEntry, may be better called 'semanticReference', and be exepcted to resolve to a definitional resource such as an ontology (class/expression)

'reference' seems to hold more descriptive/informative links such as web pages or other web resources.
Maybe it could be called 'descriptiveReference' - in contrast with 'semanticReference'?