{
  "head": {
    "vars": [ "x" , "v" , "z" , "x2" ]
  } ,
  "results": {
    "bindings": [
      {
        "x": { "type": "uri" , "value": "http://example.org/x1" } ,
        "v": { "datatype": "http://www.w3.org/2001/XMLSchema#integer" , "type": "typed-literal" , "value": "2" } ,
        "z": { "type": "uri" , "value": "http://example.org/x1" } ,
        "x2": { "type": "uri" , "value": "http://example.org/x2" }
      }
    ]
  }
}