@prefix rs:      <http://www.w3.org/2001/sw/DataAccess/tests/result-set#> .

[]    a       rs:ResultSet ;
      rs:resultVariable "y" , "x" ;
      rs:size "1" ;
      rs:solution
              [ rs:binding
                        [ rs:value <http://rdf.hp.com/p7> ;
                          rs:variable "y"
                        ] ;
                rs:binding
                        [ rs:value <http://rdf.hp.com/r> ;
                          rs:variable "x"
                        ]
              ] .