server-side author annotation

[michielbdejong]

An idea that @RubenVerborgh mentioned yesterday, which I think sounds brilliant:

When a client writes to a server, for instance a PATCH that adds triples to a doc or a POST to an inbox, we could have a specific predicate (e.g. http://xmlns.com/foaf/spec/#term_maker) that triggers a server-side check: If you add the triple

<> foaf:maker <https://michielbdejong.inrupt.net/profile/card#me>.

in an unauthenticated request, or when authenticated as anyone other than https://michielbdejong.inrupt.net/profile/card#me, the request would fail with a meaningful error message.

When then doing a GET for such a document, there should probably be a response header that allows the server to state that "this RDF source contains foaf:maker triples that have all been checked by this server at write time"

[csarven]

I think the underlying issue is covered in #66 . If this is intended as a proposed solution, I suggest to move it there.

[michielbdejong]

Continued in #66