メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.9187500 43.0583333, 144.9250000 43.0583333, 144.9250000 43.0625000, 144.9187500 43.0625000, 144.9187500 43.0583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral