メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.9125000 43.4333333, 145.9187500 43.4333333, 145.9187500 43.4375000, 145.9125000 43.4375000, 145.9125000 43.4333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral