{ "head": {
    "vars": [ "s" , "p" , "o" , "g1" , "q" , "z" , "g2" ]
  } ,
  "results": {
    "bindings": [
      { 
        "s": { "type": "bnode" , "value": "b0" } ,
        "p": { "type": "uri" , "value": "http://example/r" } ,
        "o": { "type": "uri" , "value": "http://example/o3" } ,
        "g1": { "type": "uri" , "value": "http://example/g1" } ,
        "q": { "type": "uri" , "value": "http://example/pb" } ,
        "z": { "type": "literal" , "value": "abc" } ,
        "g2": { "type": "uri" , "value": "http://example/g2" }
      }
    ]
  }
}