メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.5812500 43.8333333, 144.5875000 43.8333333, 144.5875000 43.8375000, 144.5812500 43.8375000, 144.5812500 43.8333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral