メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.87490909338 38.1425837185377, 140.873452093874 38.1434198954953, 140.872624773789 38.1422205555858, 140.8735192185 38.1418267747278, 140.874243948116 38.1415194852887, 140.874280955365 38.1415981706693, 140.874611664271 38.1421709040163, 140.87490909338 38.1425837185377)) ^^http://www.opengis.net/ont/geosparql#wktLiteral