メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.923959613816 43.5926606919161, 141.923681123046 43.5927259411491, 141.92350143004 43.5923623384202, 141.922430000703 43.5926295643472, 141.92236370969 43.5926458321929, 141.920736151311 43.593045550394, 141.920908904444 43.5920661224131, 141.922193496267 43.5917520980166, 141.923114281453 43.5915277711543, 141.92458073484 43.5911647149882, 141.924886996946 43.5917411617708, 141.92517328266 43.5923361164705, 141.923959613816 43.5926606919161)) ^^http://www.opengis.net/ont/geosparql#wktLiteral