メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.0812500 34.2875000, 131.0875000 34.2875000, 131.0875000 34.2916667, 131.0812500 34.2916667, 131.0812500 34.2875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral