メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.9250000 42.9083333, 143.9312500 42.9083333, 143.9312500 42.9125000, 143.9250000 42.9125000, 143.9250000 42.9083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral