Use named graphs by source for triplestore deployment?

[matentzn]

It would be great, for metadata reasons (source version etc) to use named graphs properly. Right now when you query for named graphs:

SELECT DISTINCT ?g 
WHERE {
  GRAPH ?g { ?s ?p ?o }
}

You get only a single one. What would be cool: One named graph per source, and then adding version information etc to that named graph. What do you think? This way you can also (if you want!) Restrict certain queries to incorporate only particular named graphs, which seems interesting to me.