メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.0062500 43.5750000, 142.0125000 43.5750000, 142.0125000 43.5791667, 142.0062500 43.5791667, 142.0062500 43.5750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral