jena-arq/testing/ARQ/Dataset/graph-04.rq

SELECT  *
FROM        <dft.ttl>
FROM NAMED  <dft.ttl> 
FROM NAMED  <a.ttl>
FROM NAMED  <b.ttl>
WHERE
    { GRAPH ?src1
        { ?x ?y ?z } . 
      GRAPH ?src2
        { ?z ?r ?s } .
    }