メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.345404645535 43.0267497189273, 141.344388392318 43.0266743731391, 141.343962507437 43.0266469481723, 141.343841810322 43.0266411400894, 141.343925903355 43.0259551674871, 141.344016039258 43.0252362581734, 141.344410193322 43.0252565400421, 141.345565820584 43.0253433971214, 141.345404645535 43.0267497189273)) ^^http://www.opengis.net/ont/geosparql#wktLiteral