メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.1812500 43.9083333, 144.1875000 43.9083333, 144.1875000 43.9125000, 144.1812500 43.9125000, 144.1812500 43.9083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral