メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.864298282063 43.3454735422822, 141.862208476197 43.3457841436533, 141.861772788941 43.3443193876583, 141.863849494293 43.3439899011195, 141.864298282063 43.3454735422822)) ^^http://www.opengis.net/ont/geosparql#wktLiteral