request.sparql

select DISTINCT ?t where {?s a ?t }

response.json

{
  "head" : {
    "vars" : [ "t" ]
  },
  "results" : {
    "bindings" : [ {
      "t" : {
        "type" : "uri",
        "value" : "http://xmlns.com/foaf/0.1/Agent"
      }
    }, {
      "t" : {
        "type" : "uri",
        "value" : "http://xmlns.com/foaf/0.1/Person"
      }
    }, {
      "t" : {
        "type" : "uri",
        "value" : "http://www.w3.org/2006/vcard/ns#Name"
      }
    }, {
      "t" : {
        "type" : "uri",
        "value" : "http://vivoweb.org/ontology/core#AdviseeRole"
      }
    }, {
      "t" : {
        "type" : "uri",
        "value" : "http://vivoweb.org/ontology/core#AdvisorRole"
      }
    }, {
      "t" : {
        "type" : "uri",
        "value" : "http://vivoweb.org/ontology/core#Position"
      }
    }, {
      "t" : {
        "type" : "uri",
        "value" : "http://vivoweb.org/ontology/core#AdvisingRelationship"
      }
    }, {
      "t" : {
        "type" : "uri",
        "value" : "http://vivoweb.org/ontology/core#FacultyMember"
      }
    }, {
      "t" : {
        "type" : "uri",
        "value" : "http://vivoweb.org/ontology/core#NonAcademic"
      }
    }, {
      "t" : {
        "type" : "uri",
        "value" : "http://xmlns.com/foaf/0.1/Organization"
      }
    }, {
      "t" : {
        "type" : "uri",
        "value" : "http://vivoweb.org/ontology/core#School"
      }
    }, {
      "t" : {
        "type" : "uri",
        "value" : "http://vivoweb.org/ontology/core#Department"
      }
    }, {
      "t" : {
        "type" : "uri",
        "value" : "http://vivoweb.org/ontology/core#NonFacultyAcademic"
      }
    }, {
      "t" : {
        "type" : "uri",
        "value" : "http://vivoweb.org/ontology/core#Student"
      }
    }, {
      "t" : {
        "type" : "uri",
        "value" : "http://vivoweb.org/ontology/core#Division"
      }
    }, {
      "t" : {
        "type" : "uri",
        "value" : "http://vivoweb.org/ontology/core#University"
      }
    }, {
      "t" : {
        "type" : "uri",
        "value" : "http://www.w3.org/2006/vcard/ns#Address"
      }
    } ]
  }
}