メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.342800473911 38.425284529258, 141.342880069552 38.4257871543021, 141.342684385895 38.4258120748375, 141.34252699912 38.4256086414545, 141.342231550084 38.4255503759953, 141.341962763551 38.4252252354832, 141.341973731415 38.4251563518093, 141.342800473911 38.425284529258)) ^^http://www.opengis.net/ont/geosparql#wktLiteral