メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.3812500 43.7083333, 143.3875000 43.7083333, 143.3875000 43.7125000, 143.3812500 43.7125000, 143.3812500 43.7083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral