メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.524165929927 43.8513434972247, 141.523905146231 43.851902174513, 141.520025589586 43.8509375865644, 141.520334283214 43.850405153018, 141.524165929927 43.8513434972247)) ^^http://www.opengis.net/ont/geosparql#wktLiteral