メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.584438496734 43.3380141241167, 145.583127397386 43.3375481241354, 145.583719943574 43.3367649308758, 145.585031791885 43.3373010788206, 145.584438496734 43.3380141241167)) ^^http://www.opengis.net/ont/geosparql#wktLiteral