メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.389355064351 43.7698172608168, 142.389313480522 43.7703675472269, 142.389278535608 43.770847221599, 142.387530238664 43.7707837046118, 142.387543714677 43.7703031067932, 142.38759760275 43.7697749936726, 142.387626899064 43.7692025183093, 142.389310925338 43.7692715081046, 142.389342408945 43.7696442127016, 142.389355064351 43.7698172608168)) ^^http://www.opengis.net/ont/geosparql#wktLiteral