メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.369231031553 43.0972370718645, 141.367964257089 43.0970682412175, 141.367679677082 43.0970303230388, 141.367968551299 43.0959216770351, 141.369475133032 43.0961235097523, 141.369350317981 43.0966757335671, 141.369231031553 43.0972370718645)) ^^http://www.opengis.net/ont/geosparql#wktLiteral