jena-sdb/testing/Algebra/opt-filter.rq - jena - Git at Google

 PREFIX :    <http://example/>

 SELECT *
 {
   ?x :p ?v .
   OPTIONAL
   {
     ?y :q ?w .
     FILTER(?v=2)
   }
 }
	PREFIX : <http://example/>

	SELECT *
	{
	?x :p ?v .
	OPTIONAL
	{
	?y :q ?w .
	FILTER(?v=2)
	}
	}