メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7812500 42.5500000, 140.7875000 42.5500000, 140.7875000 42.5541667, 140.7812500 42.5541667, 140.7812500 42.5500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral