Requirement: queries written as RDF

I'd like some clarification of just what we're trying to get at from
this requirement.

Are we saying that we want queries to fit into the RDF/XML syntax? I'd
like clarification on just what users and use cases benefit from such a
syntax. My experience is that forcing RDF/XML syntax just makes it damn
near impossible for humans to compose a document without lots of help
from tools. If queries are being generated automatically, most software
systems are pretty agnostic just what their output syntax is, so I don't
see RDF representations as helping them much, either.

Are we saying that we want queries to fit the RDF data model? If so, I
don't think it's met trivially, since just about anything can be
translated into RDF--that's the whole point of RDF.

Or are we saying that given some chunk of RDF, there should be some
sensible query connotation that it invokes? Is this a roundabout way of
getting back to entailment as an independent query--i.e. here's some
RDF; does it necessarily follow from the source I'm querying?