メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.594149110099 43.0271265944433, 141.592208059384 43.0291942551259, 141.588569911818 43.0273789659491, 141.590531089454 43.025295370031, 141.591370222824 43.025725276464, 141.594149110099 43.0271265944433)) ^^http://www.opengis.net/ont/geosparql#wktLiteral