メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.347531996229 43.0268982457255, 141.345404645535 43.0267497189273, 141.345565820584 43.0253433971214, 141.347716352053 43.0254896428196, 141.347663154997 43.025895170765, 141.347629286123 43.0262180028287, 141.347531996229 43.0268982457255)) ^^http://www.opengis.net/ont/geosparql#wktLiteral