メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.0250000 33.8333333, 131.0312500 33.8333333, 131.0312500 33.8375000, 131.0250000 33.8375000, 131.0250000 33.8333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral