メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.913356846868 43.5060597449315, 141.91145424823 43.5063408052072, 141.911204249695 43.5054222723174, 141.910973194834 43.5046624505793, 141.912857456336 43.5043738915898, 141.913049510584 43.5050238151525, 141.913356846868 43.5060597449315)) ^^http://www.opengis.net/ont/geosparql#wktLiteral