メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.991497735416 43.5552433177278, 144.991223679374 43.5550592621045, 144.990610718849 43.5546639780246, 144.990930792544 43.5544346537963, 144.991690738692 43.5549369134795, 144.991791928211 43.5550019553621, 144.991497735416 43.5552433177278)) ^^http://www.opengis.net/ont/geosparql#wktLiteral