SPARQL vnext new feature?

Was playing around with SPARQL's grammar courtesy of Eric Prud'Hommeaux and
we checked what needed to be done to facilitate more concise queries against
remote endpoints.

Eric changed:

[9]     DatasetClause     ::=       'FROM' ( DefaultGraphClause |
NamedGraphClause |   'CONSTRUCT' ConstructTemplate DatasetClause*
WhereClause )

to allow

SELECT ?a ?b
  FROM ( CONSTRUCT { ?d <b> ?b }
                          FROM <http://example.com/sparql?>
                        WHERE { ?b <b> ?d } )
 WHERE { ?a <b> ?b }

The idea is that currently one has to do something like

SELECT ?a ?b
WHERE
   {
        GRAPH <http://example.com/sparql?query=CONSTRUCT%20%7B%20%3Fd
%20%3Cb%3E%20%3Fb%20%7D%20FROM%20%3Casdf%3E%20WHERE%20%7B%20%3Fb%20%
3Cb%3E%20%3Fd%20%7D%20&format=text%2Frdf%2Bn3>
        { ?b <b> ?d.}
{ ?a <b> ?b }
   }

Which is somewhat less likely to be written.

-Alan