{
  "prefix": {
    "ex": "http://example.org/"
  },
  "used": {
    "ex:use4": {
      "prov:activity": "ex:a1",
      "prov:time": "2014-06-23T12:28:54.503+01:00",
      "prov:role": {
        "$": "somerole",
        "type": "xsd:string"
      },
      "prov:entity": "ex:e1"
    }
  }
}