メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.343951678129 43.7686842236085, 142.344201678221 43.7689594093164, 142.344432523215 43.7692134976238, 142.342932126618 43.7696260054324, 142.342780523839 43.7693631276454, 142.342613019035 43.7690681087952, 142.342302725803 43.7685301261938, 142.343531281063 43.7682052484783, 142.343951678129 43.7686842236085)) ^^http://www.opengis.net/ont/geosparql#wktLiteral