メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.758855097718 43.1942698543251, 141.757964519301 43.1938207860252, 141.758597252753 43.193105383784, 141.75951405258 43.1935557579835, 141.758855097718 43.1942698543251)) ^^http://www.opengis.net/ont/geosparql#wktLiteral