メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.6062500 43.3083333, 145.6125000 43.3083333, 145.6125000 43.3125000, 145.6062500 43.3125000, 145.6062500 43.3083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral