A couple of other nit-picks: - I'd like to see the `file` node have a mime type field. - Why limit links to URLs, as opposed to URIs? - You might want to put

A couple of other nit-picks: - I'd like to see the `file` node have a mime type field. - Why limit links to URLs, as opposed to URIs? - You might want to put a version field in the top level!