メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.334552774295 43.1421842909694, 141.33465741495 43.1426253140875, 141.334762073146 43.1430716123364, 141.335087416772 43.1443832375595, 141.332575760019 43.1446974804815, 141.332245998623 43.1432222925939, 141.33221647467 43.1430899780506, 141.332078000365 43.1425105533509, 141.331955887236 43.1419996896816, 141.332477404881 43.1419345129219, 141.334436066065 43.1416895799818, 141.334552774295 43.1421842909694)) ^^http://www.opengis.net/ont/geosparql#wktLiteral