メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.0750000 35.8250000, 140.0812500 35.8250000, 140.0812500 35.8291667, 140.0750000 35.8291667, 140.0750000 35.8250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral