メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.523167740137 43.8549850854425, 141.523954097457 43.85526340642, 141.523780142081 43.8554439820203, 141.523056584116 43.8552118902728, 141.523167740137 43.8549850854425)) ^^http://www.opengis.net/ont/geosparql#wktLiteral