メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.302422531513 42.2872874774281, 143.299764820616 42.2880367184114, 143.294738638578 42.287672083536, 143.293745127095 42.2857897336196, 143.296603951848 42.28713895333, 143.301598336109 42.2855070431753, 143.302422531513 42.2872874774281)) ^^http://www.opengis.net/ont/geosparql#wktLiteral