メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.0812500 33.6208334, 131.0875000 33.6208334, 131.0875000 33.6250000, 131.0812500 33.6250000, 131.0812500 33.6208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral