メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.5312500 33.0375000, 131.5375000 33.0375000, 131.5375000 33.0416667, 131.5312500 33.0416667, 131.5312500 33.0375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral