メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.365234169291 43.7733946499033, 142.365123521157 43.7732082686245, 142.364917284462 43.77283956844, 142.366447142712 43.7723812478386, 142.366771850405 43.7729545850822, 142.365234169291 43.7733946499033)) ^^http://www.opengis.net/ont/geosparql#wktLiteral