メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.749580508282 43.1894242592631, 141.748825019258 43.1902211503278, 141.748300568552 43.1899619449917, 141.748185319685 43.1890587049337, 141.748029915441 43.1877603252364, 141.7480263164 43.1877303506947, 141.750144062677 43.1888248512288, 141.749580508282 43.1894242592631)) ^^http://www.opengis.net/ont/geosparql#wktLiteral