メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.1000000 26.5750000, 128.1062500 26.5750000, 128.1062500 26.5791667, 128.1000000 26.5791667, 128.1000000 26.5750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral