メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.0812500 40.0083333, 140.0875000 40.0083333, 140.0875000 40.0125000, 140.0812500 40.0125000, 140.0812500 40.0083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral