メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.449137032292 43.8233927197745, 142.446869087978 43.8253195758075, 142.445919237432 43.8247277310029, 142.443865005873 43.8234513354767, 142.446162177612 43.8215059966713, 142.446479641452 43.8217186988046, 142.449137032292 43.8233927197745)) ^^http://www.opengis.net/ont/geosparql#wktLiteral