メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.7750000 40.2083333, 141.7812500 40.2083333, 141.7812500 40.2125000, 141.7750000 40.2125000, 141.7750000 40.2083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral