メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.246681686618 43.0585919442051, 141.246355310489 43.0585621478261, 141.245674123216 43.0584939336544, 141.245218637236 43.058435925254, 141.245260289158 43.0576711215856, 141.245568853989 43.0576987956649, 141.24677095506 43.0577997762806, 141.246681686618 43.0585919442051)) ^^http://www.opengis.net/ont/geosparql#wktLiteral