メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.901345285274 43.4611943279127, 141.900219023156 43.4613810992188, 141.89990700046 43.4603337268956, 141.899534381766 43.4590982648585, 141.900673240394 43.4590513079007, 141.900715744511 43.4590468309735, 141.901345285274 43.4611943279127)) ^^http://www.opengis.net/ont/geosparql#wktLiteral