Ontology issue: vra:Agent and associated properties may need a little more work?

[gerontakos]

The ontology appears to assert that any agent associated with a work or image must be either an author or a creator. The difference between these two is not clear. In addition, there are 26 different types of creators. There are some dubious classifications here. A collector is a creator. A person who commissions a work is a creator. This seems worth reconsidering. Many schemas make a distinction between creator and contributor.