メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.8750000 33.0583333, 131.8812500 33.0583333, 131.8812500 33.0625000, 131.8750000 33.0625000, 131.8750000 33.0583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral