メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.7500000 43.3458334, 145.7562500 43.3458334, 145.7562500 43.3500000, 145.7500000 43.3500000, 145.7500000 43.3458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral