{
  "head": {
    "vars": [ "x" , "v" ]
  } ,
  "results": {
    "bindings": [
      {
        "x": { "type": "uri" , "value": "http://example/x1" }
      } ,
      {
        "x": { "type": "uri" , "value": "http://example/x2" }
      } ,
      {
        "x": { "type": "uri" , "value": "http://example/x3" }
      } ,
      {
        "x": { "type": "uri" , "value": "http://example/x3a" }
      } ,
      {
        "x": { "type": "uri" , "value": "http://example/x4" }
      }
    ]
  }
}