メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.751874542565 42.8927768273869, 140.751140492831 42.8928127955045, 140.751137963323 42.8928303458235, 140.750382682083 42.8928423998099, 140.749634131691 42.8929043306915, 140.749633302283 42.8928556513863, 140.749518616508 42.8917624037862, 140.749517063028 42.8917475439813, 140.750253253716 42.8917253267224, 140.751056208452 42.8916793633007, 140.75105585274 42.8916940577159, 140.751756289734 42.8916551169448, 140.751874542565 42.8927768273869)) ^^http://www.opengis.net/ont/geosparql#wktLiteral