メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.0312500 44.0833333, 144.0375000 44.0833333, 144.0375000 44.0875000, 144.0312500 44.0875000, 144.0312500 44.0833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral