メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.7717907214 43.2072237275235, 141.771670790662 43.2072040277223, 141.770751443775 43.2067391134663, 141.770808141686 43.2066872381725, 141.771517651113 43.2059506324045, 141.772530931419 43.2064572809432, 141.7717907214 43.2072237275235)) ^^http://www.opengis.net/ont/geosparql#wktLiteral