メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.900219023156 43.4613810992188, 141.898360549093 43.4616892527039, 141.897898075396 43.4600935193254, 141.897501530826 43.4586923641753, 141.899219091736 43.4590749050189, 141.899534381766 43.4590982648585, 141.89990700046 43.4603337268956, 141.900219023156 43.4613810992188)) ^^http://www.opengis.net/ont/geosparql#wktLiteral