Query By Reference in SPARQL Protocol

Hi,

Currently the SPARQL protocol for RDF requires that a query
must be directly included in the incoming message; in HTTP
binding, as the value of the "query" parameter. As a side effect
of this, the protocol must also support a POST option
for "...cases where the URL-encoded query exceeds practicable limits"

I'd like to suggest that the ability to indicate the query "by
reference", i.e. via URI just like the data sets would be a valuable
addition:

* allowing queries to be more easily published and shared

* faciliate "URL pipelining", e.g. scenarios where the query itself
is the output of another service

* reduce the need to resort to a POST operation, as queries need not be 
directly included in the request.

Cheers,

L.