メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.1875000 43.2083333, 145.1937500 43.2083333, 145.1937500 43.2125000, 145.1875000 43.2125000, 145.1875000 43.2083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral