メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.4750000 32.0333333, 131.4812500 32.0333333, 131.4812500 32.0375000, 131.4750000 32.0375000, 131.4750000 32.0333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral