jena-arq/testing/ARQ/Extra/sub-select-project-01.srj

{
  "head": {
    "vars": [ "s" , "o" ]
  } ,
  "results": {
    "bindings": [
      {
        "s": { "type": "uri" , "value": "http://example/s" } ,
        "o": { "datatype": "http://www.w3.org/2001/XMLSchema#integer" , "type": "typed-literal" , "value": "1" }
      }
    ]
  }
}