メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.391771351759 43.7818099477645, 142.390596065074 43.7821461505703, 142.390167191326 43.781365548182, 142.391342453503 43.7810192044125, 142.391771351759 43.7818099477645)) ^^http://www.opengis.net/ont/geosparql#wktLiteral