メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.3812500 32.0833333, 131.3875000 32.0833333, 131.3875000 32.0875000, 131.3812500 32.0875000, 131.3812500 32.0833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral