メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.911448637273 43.4816591730097, 141.910702537759 43.4818013060413, 141.910335616681 43.4805640466577, 141.911103798872 43.4804381559643, 141.911216189358 43.4808372654, 141.911388042277 43.4814475616064, 141.911412850334 43.4815356822901, 141.911448637273 43.4816591730097)) ^^http://www.opengis.net/ont/geosparql#wktLiteral