メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.351563172199 43.7677946823991, 142.351873342585 43.7683546492775, 142.35037695944 43.7687903127222, 142.350052579858 43.7682361905791, 142.350080318886 43.768228149572, 142.349746103881 43.7676623625532, 142.351252971166 43.7672218106182, 142.351563172199 43.7677946823991)) ^^http://www.opengis.net/ont/geosparql#wktLiteral