メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.0875000 42.0333333, 140.0937500 42.0333333, 140.0937500 42.0375000, 140.0875000 42.0375000, 140.0875000 42.0333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral