メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4750000 40.7333333, 140.4812500 40.7333333, 140.4812500 40.7375000, 140.4750000 40.7375000, 140.4750000 40.7333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral