メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.5750000 41.0458334, 140.5812500 41.0458334, 140.5812500 41.0500000, 140.5750000 41.0500000, 140.5750000 41.0458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral