I think WebDAV would be a much more natural fit for this problem. When people think WebDAV they usually think Microsoft, but it's actually a very mature, open HTTP extension standard.

RDF has a high barrier to entry, and it's going to take a lot of work to get this REST API to even come close to what WebDAV already does-

  * Locking
  * Versioning
  * Expressive ACLs
  * Expressive search
  * Quotas
  * Simple distributed data structures

Granted, some of those features use an equally arcane XML syntax, but at least there's already tooling.