メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.974395806919 43.5575417871813, 144.974040068902 43.5572994452088, 144.974284002016 43.5571039460522, 144.975134873394 43.5564221673256, 144.975501681153 43.5566655775044, 144.974395806919 43.5575417871813)) ^^http://www.opengis.net/ont/geosparql#wktLiteral