メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.8500000 34.7083333, 131.8562500 34.7083333, 131.8562500 34.7125000, 131.8500000 34.7125000, 131.8500000 34.7083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral