メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.931208876467 43.5684902921715, 141.926447965255 43.5696768953897, 141.926210466845 43.5691983940489, 141.925829173261 43.5684047801648, 141.925772078528 43.5682708240272, 141.925350946259 43.5673968206124, 141.925233093702 43.5671543909573, 141.930014648508 43.5659846704656, 141.931208876467 43.5684902921715)) ^^http://www.opengis.net/ont/geosparql#wktLiteral