メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.348441728802 43.7744219769701, 142.348659560074 43.7748261334216, 142.347250594032 43.7752542872174, 142.347243626857 43.7752415125738, 142.347020695447 43.7748321547606, 142.346793054061 43.7744194600617, 142.348207722453 43.7740132471217, 142.348441728802 43.7744219769701)) ^^http://www.opengis.net/ont/geosparql#wktLiteral