メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.747505906504 43.1895488681758, 141.747067202905 43.1900100543737, 141.74666014662 43.1904379725254, 141.746107070896 43.1910193365719, 141.744670702422 43.1902782236039, 141.745217076045 43.189706117664, 141.745631515758 43.1892693038221, 141.746073530318 43.1888036330791, 141.747505906504 43.1895488681758)) ^^http://www.opengis.net/ont/geosparql#wktLiteral