メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.062160457702 43.7064915329562, 142.062540268204 43.7074961034009, 142.060092946357 43.7080669142593, 142.05798316578 43.7085969678907, 142.057367332532 43.7067255749461, 142.059318159899 43.7060852253455, 142.061648707103 43.7052474517288, 142.062160457702 43.7064915329562)) ^^http://www.opengis.net/ont/geosparql#wktLiteral