メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.6500000 43.0333333, 143.6562500 43.0333333, 143.6562500 43.0375000, 143.6500000 43.0375000, 143.6500000 43.0333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral