メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.975335780926 43.5622793450992, 144.974800118965 43.5619291752349, 144.974874099185 43.5618714028464, 144.975666763552 43.56123984721, 144.976201935041 43.5615749062137, 144.97539899402 43.5622315329029, 144.975335780926 43.5622793450992)) ^^http://www.opengis.net/ont/geosparql#wktLiteral