メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.0750000 26.5708334, 128.0812500 26.5708334, 128.0812500 26.5750000, 128.0750000 26.5750000, 128.0750000 26.5708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral