メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.459554401317 43.7773227106912, 142.458104303293 43.7774000455723, 142.455971726213 43.7775137092753, 142.455844166834 43.7761068537315, 142.45573284419 43.775015797634, 142.457868188612 43.7749259246663, 142.459325072875 43.7748631924648, 142.459554401317 43.7773227106912)) ^^http://www.opengis.net/ont/geosparql#wktLiteral