メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.8375000 43.0291667, 144.8437500 43.0291667, 144.8437500 43.0333333, 144.8375000 43.0333333, 144.8375000 43.0291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral