メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.5437500 43.2083333, 144.5500000 43.2083333, 144.5500000 43.2125000, 144.5437500 43.2125000, 144.5437500 43.2083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral