メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.603716137879 43.3083557236334, 144.602160296161 43.3082647548664, 144.60223424512 43.3070372149029, 144.603681215485 43.3070676253571, 144.603782899815 43.3072919022224, 144.603716137879 43.3083557236334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral