メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.978236363598 43.5479636160476, 144.978188557172 43.5479325872944, 144.977152060367 43.5472532743034, 144.97675437251 43.5469885607306, 144.977227744616 43.5465955360203, 144.977597569114 43.5468427002338, 144.978654166016 43.5475389680443, 144.978721518711 43.5475832432526, 144.978236363598 43.5479636160476)) ^^http://www.opengis.net/ont/geosparql#wktLiteral