メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.383462152131 43.7825627122048, 142.382773041232 43.7827597558785, 142.382015318544 43.7829851770602, 142.381485629064 43.7820347577785, 142.38223640576 43.7818223224027, 142.382953140119 43.7816167242759, 142.38348299533 43.7825567635856, 142.383462152131 43.7825627122048)) ^^http://www.opengis.net/ont/geosparql#wktLiteral