メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.920738210299 43.4997221978416, 141.916901280235 43.5003210094469, 141.916645104707 43.4994426915675, 141.920631080673 43.4987452625215, 141.920690744117 43.4992337829051, 141.920735534606 43.4996947976146, 141.920738210299 43.4997221978416)) ^^http://www.opengis.net/ont/geosparql#wktLiteral