{ "items" : [
    { "id" : "http://www.openlinksw.com/schemas/googleplus#url_value"
      "properties" : {
        "http://www.w3.org/2000/01/rdf-schema#subPropertyOf" : [ "http://rdfs.org/sioc/ns#link",
          "http://purl.org/dc/elements/1.1/source",
          "http://purl.org/dc/terms/source"] } } }
