@prefix xsd:     <http://www.w3.org/2001/XMLSchema#> .
@prefix rs:      <http://www.w3.org/2001/sw/DataAccess/tests/result-set#> .
@prefix rdf:     <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix :        <http://example.org/ns#> .

[]    rdf:type    rs:ResultSet ;
      rs:resultVariable  "a" ;
      rs:solution
                  [ rs:binding  [ rs:value    :x1 ;
                                  rs:variable  "a"
                                ]
                  ] ;
      rs:solution
                  [ rs:binding  [ rs:value    :x2 ;
                                  rs:variable  "a"
                                ]
                  ] ;
      rs:solution
                  [ rs:binding  [ rs:value    :x4 ;
                                  rs:variable  "a"
                                ]
                  ] ;
      rs:solution
                  [ rs:binding  [ rs:value    :x3 ;
                                  rs:variable  "a"
                                ]
                  ] .