メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4750000 39.5083333, 140.4812500 39.5083333, 140.4812500 39.5125000, 140.4750000 39.5125000, 140.4750000 39.5083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral