Default Graph URI in Sparql Client

Hi everyone!

May be i’m not clearly understand Sparql Client
(http://github.com/bendiken/sparql-client), but i didn’t find way how to
define graph repository (or i’m blind)

For example, i follow to http://dbpedia.org/sparql and define Default
Graph URI http://tema.livejournal.com/data/foaf.rdf and Query text
Select select ?name WHERE { ?x foaf:knows ?name} (all this i done in web
browser)

BUT!!! where i should define Default Graph URI in Sparql Client library?

Thanks in advance!