メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.360082111226 43.7672184318974, 142.358594456506 43.7676410524994, 142.358324156104 43.7671173703639, 142.35801133028 43.7665834768848, 142.359513114463 43.7661505726855, 142.360082111226 43.7672184318974)) ^^http://www.opengis.net/ont/geosparql#wktLiteral