メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7750000 43.1500000, 140.7812500 43.1500000, 140.7812500 43.1541667, 140.7750000 43.1541667, 140.7750000 43.1500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral