メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.342613019035 43.7690681087952, 142.342780523839 43.7693631276454, 142.342932126618 43.7696260054324, 142.342914521529 43.7696310300216, 142.341530263521 43.7700248938929, 142.341219013357 43.7694628202067, 142.340941722229 43.7689274245794, 142.342302725803 43.7685301261938, 142.342613019035 43.7690681087952)) ^^http://www.opengis.net/ont/geosparql#wktLiteral