メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.3437500 43.8583333, 144.3500000 43.8583333, 144.3500000 43.8625000, 144.3437500 43.8625000, 144.3437500 43.8583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral