SPARQL 1.1 Graphstore Protocol

[Will]

Hi,
I am writing some Groovy extensions for Jena, but am struggling to find 
anything about support for:
http://www.w3.org/TR/2013/REC-sparql11-http-rdf-update-20130321/
Could someone point me in the right direction. I guess I could use the 
equivalent SPARQL Update operations, but any advice would be appreciated.
Many Thanks,
Will