メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7750000 40.7875000, 140.7812500 40.7875000, 140.7812500 40.7916667, 140.7750000 40.7916667, 140.7750000 40.7875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral