メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.421988955808 43.8291139794807, 142.420630721664 43.8281400847502, 142.422360490397 43.8269685382755, 142.422197179389 43.8268347341521, 142.422563090105 43.826590212588, 142.422726395266 43.826713291548, 142.423210480354 43.8263559902777, 142.424479672215 43.827276345585, 142.421988955808 43.8291139794807)) ^^http://www.opengis.net/ont/geosparql#wktLiteral