Querying Named Graph using SPARQL

Hi all,

I have been looking at the SPARQL 1.1 specification [1] and I can't find a
way to retrieve the list of graphs found into a repository. I have managed
to extract quads from the repository (?g ?s ?p ?o) using
        SELECT ?g ?s ?p ?o
        WHERE {
 GRAPH ?g {?s ?o ?p}
        }

Is there a better way to extract the list of graphs? If not, I think that
SPARQL should offer a mechanism to extract a list of graphs in a similar
way that SQL allows people to.

I look forward to hearing from you.

Cheers,

Quentin

[1] http://www.w3.org/TR/sparql11-query/