メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.5937500 43.2833333, 145.6000000 43.2833333, 145.6000000 43.2875000, 145.5937500 43.2875000, 145.5937500 43.2833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral