メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.355019152889 43.0552057759434, 141.354866678394 43.0558839694575, 141.35475726055 43.0563381473131, 141.353190553516 43.056132045649, 141.353303588164 43.0556805705079, 141.35349650881 43.0549328588323, 141.355026749629 43.0551384600762, 141.355019152889 43.0552057759434)) ^^http://www.opengis.net/ont/geosparql#wktLiteral