Based on the spec from 2009-10-31 15:00Z
Notes: All the stuff to do with URIs is not actually implemented yet.
Extract from: URL Text
Output type: HTML Summary JSON RDF: N3 RDF:RDF/ XML RDF:N Triples
URL
Document URL (leave blank to use about:blank or something. This doesn't actually do anything yet so it's not that important)
Source: