メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.0375000 43.7541667, 145.0437500 43.7541667, 145.0437500 43.7583333, 145.0375000 43.7583333, 145.0375000 43.7541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral