メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.773204347533 43.2098625645197, 141.772856242133 43.2102398328926, 141.772284015258 43.2108321440784, 141.771375704279 43.2103741748704, 141.7719238051 43.2098123587493, 141.772314203841 43.2094183917701, 141.772990327082 43.2097691214281, 141.773204347533 43.2098625645197)) ^^http://www.opengis.net/ont/geosparql#wktLiteral