メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.0812500 39.8333333, 140.0875000 39.8333333, 140.0875000 39.8375000, 140.0812500 39.8375000, 140.0812500 39.8333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral