According to the rdflib homepage, the SPARQL language support has been moved to a separate project: "SPARQL is no longer shipped with Core rdflib - instead it is now a part of rdfextras" http://code.google.com/p/rdflib/wiki/IntroSparql This is an ebuild for this rdfextras package, which (among other things) adds support for SPARQL to the rdflib module.
Created attachment 245683 [details] rdfextras-20100728.ebuild rdfextras-20100728.ebuild
It seems that this package is no longer in Sunrise.