メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7750000 41.9583333, 140.7812500 41.9583333, 140.7812500 41.9625000, 140.7750000 41.9625000, 140.7750000 41.9583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral