Integration with other vocabularies
This has come up a couple times: currently with OKH (Open Know-How, where @hoijui is a key person) in the context of open source hardware; and awhile ago with ActivityPub/ActivityStreams for adding VF to AP/AS social networking federation, which is not consolidated yet. It also intersects somewhat with our practice of using other vocabularies as part of what is actually needed for a VF implementation, e.g. foaf:Agent, foaf:Person, org:Organization, geo:SpatialThing.... but is not necessarily the same.
This issue is a place to work through the best practice technical and semantic ways to document integrations in the vocabulary itself. For example, there are bunch of ways to indicate degrees of same-ness, such as owl:sameAs. Also, using rdfs:subClassOf or rdfs:subPropertyOf. And others, need to do some research.