メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.2000000 43.5541667, 145.2062500 43.5541667, 145.2062500 43.5583333, 145.2000000 43.5583333, 145.2000000 43.5541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral