メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.681037375701 42.6799930241866, 141.681402637268 42.6803155257478, 141.682301075049 42.6811087784557, 141.682374454056 42.6811735603554, 141.682729341252 42.6814868665439, 141.683640663001 42.6822913932131, 141.682284116795 42.6829600478268, 141.682129038222 42.6830364831893, 141.679300187639 42.6844621618107, 141.678339069566 42.6834411890476, 141.676575627965 42.6815678173724, 141.676456403639 42.6814611572636, 141.677904819142 42.6803647546636, 141.678905432113 42.6796072896002, 141.679818022975 42.6789163726553, 141.681037375701 42.6799930241866)) ^^http://www.opengis.net/ont/geosparql#wktLiteral