メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.383614448998 43.0760514098606, 141.383175578972 43.0762181441185, 141.383243969869 43.0763213426013, 141.383457553762 43.0766468946404, 141.383172583984 43.0767510755026, 141.383168339667 43.0767526610569, 141.382627616374 43.07695034041, 141.382176950017 43.0763062283666, 141.381943288111 43.075969620877, 141.382468582183 43.0757565666931, 141.383093352588 43.0755031902157, 141.383207051947 43.0754750748795, 141.383458838321 43.0758194830527, 141.383614448998 43.0760514098606)) ^^http://www.opengis.net/ont/geosparql#wktLiteral