RE: SPARQL vnext new feature? cascadedQueries

There are several places where nesting of queries might be useful - in
the CONSTRUCT clause is one place which is convenient syntax

Another is in the pattern itself: by popular demand I added a limited
form:

SELECT ?a
FROM <mybooks.rdf>
{
  ?b dc:title ?title .
  SERVICE <http://sparql.org/books>
     { ?s dc:title ?title . ?s dc:creator ?a }

http://jena.sourceforge.net/ARQ/service.html


With aggregation and GROUP BY, nested SELECT queries in-pattern make a
lot of sense.

Also EXISTS in FILTERs.

	Andy