good point, I think we should consider how similar we are going to follow in the prov group's footsteps. Are we just going to have a terms list and call it a "data model" or will this evolve into an ontology at some point, where terms are proper subclasses of the prov (ontology and others)?

Following the info at  http://www.w3.org/ns/prov#, this is a namespace page with links to all their specifications (i.e., data model, ontology, and serializations). I can imagine that someone landing on the nidash namespace would get something similar, so maybe referring to everything as "nidm" doesn't quite capture all our longterm uses?

Why not something more generic like: http://nidash.org/ns#