メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.748029915441 43.1877603252364, 141.748185319685 43.1890587049337, 141.748300568552 43.1899619449917, 141.747505906504 43.1895488681758, 141.746073530318 43.1888036330791, 141.745882034705 43.1887088323975, 141.746913004833 43.1874957000462, 141.747165337001 43.1875553912507, 141.748029915441 43.1877603252364)) ^^http://www.opengis.net/ont/geosparql#wktLiteral