メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.0812500 36.3000000, 139.0875000 36.3000000, 139.0875000 36.3041667, 139.0812500 36.3041667, 139.0812500 36.3000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral