メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.524421150705 43.8508587078948, 141.524165929927 43.8513434972247, 141.520334283214 43.850405153018, 141.52054595488 43.8499357934043, 141.520557601379 43.8498731059538, 141.524421150705 43.8508587078948)) ^^http://www.opengis.net/ont/geosparql#wktLiteral