メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.765066010542 43.1898675270563, 141.765581872898 43.1901338637413, 141.765392240288 43.1904499562389, 141.765126196908 43.1907536304403, 141.764873933522 43.1910036298403, 141.764269513659 43.1906986557506, 141.763847539805 43.1904710398912, 141.76399004943 43.1903108768293, 141.764644087479 43.1896399142554, 141.765066010542 43.1898675270563)) ^^http://www.opengis.net/ont/geosparql#wktLiteral