メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.3000000 31.7083333, 131.3062500 31.7083333, 131.3062500 31.7125000, 131.3000000 31.7125000, 131.3000000 31.7083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral