メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.981831785764 43.5496181055056, 144.981336174662 43.5500151624877, 144.980545149553 43.5494765534269, 144.981034123161 43.5490823308847, 144.981831785764 43.5496181055056)) ^^http://www.opengis.net/ont/geosparql#wktLiteral