メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.001606642165 43.5661219123796, 145.000722217873 43.5655840400643, 145.001608216251 43.5648749494122, 145.002447193418 43.5654214337365, 145.001606642165 43.5661219123796)) ^^http://www.opengis.net/ont/geosparql#wktLiteral