メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.353389771385 43.0683796260145, 141.353009668364 43.0683957748044, 141.351715662125 43.0682224527507, 141.352068674633 43.0669538774284, 141.352956920258 43.0670729535562, 141.353220639602 43.0671107497992, 141.353698310528 43.067198467971, 141.353389771385 43.0683796260145)) ^^http://www.opengis.net/ont/geosparql#wktLiteral