メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.752929000048 43.1888198863418, 141.752031951537 43.1897749130495, 141.751085688099 43.189303323957, 141.751804779153 43.1885688526662, 141.752929000048 43.1888198863418)) ^^http://www.opengis.net/ont/geosparql#wktLiteral