メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.1500000 43.9833333, 145.1562500 43.9833333, 145.1562500 43.9875000, 145.1500000 43.9875000, 145.1500000 43.9833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral