メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.385197580125 42.9846533020339, 144.383606333335 42.9843759038647, 144.383612047704 42.9843583560713, 144.383794281947 42.9837840395829, 144.385391225939 42.984065901861, 144.385197580125 42.9846533020339)) ^^http://www.opengis.net/ont/geosparql#wktLiteral