メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.002462648813 43.5666640144779, 145.001606642165 43.5661219123796, 145.002447193418 43.5654214337365, 145.003313090755 43.5659853709675, 145.002462648813 43.5666640144779)) ^^http://www.opengis.net/ont/geosparql#wktLiteral