{ "head": {
    "vars": [ "x" , "left" , "right" ]
  } ,
  "results": {
    "bindings": [
      { 
        "x": { "type": "uri" , "value": "http://example/x7" } ,
        "left": {
          "type": "triple" , 
          "value": {
            "subject":  { "type": "uri" , "value": "http://example/a" } ,
            "predicate": { "type": "uri" , "value": "http://example/b" } ,
            "object":   { "type": "literal" , "datatype": "http://www.w3.org/2001/XMLSchema#integer" , "value": "9" }
          }
        } ,
        "right": {
          "type": "triple" , 
          "value": {
            "subject":  { "type": "uri" , "value": "http://example/a" } ,
            "predicate": { "type": "uri" , "value": "http://example/b" } ,
            "object":   { "type": "literal" , "datatype": "http://www.w3.org/2001/XMLSchema#integer" , "value": "123" }
          }
        }
      }
    ]
  }
}