メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.5750000 40.2416667, 140.5812500 40.2416667, 140.5812500 40.2458334, 140.5750000 40.2458334, 140.5750000 40.2416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral