メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.5750000 43.3416667, 145.5812500 43.3416667, 145.5812500 43.3458334, 145.5750000 43.3458334, 145.5750000 43.3416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral