メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.6437500 43.2333333, 144.6500000 43.2333333, 144.6500000 43.2375000, 144.6437500 43.2375000, 144.6437500 43.2333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral