メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.905123984444 43.5296905405461, 141.904530220712 43.529365673471, 141.90409843026 43.5285227582924, 141.904372267677 43.5283035798391, 141.905352663562 43.5274426877435, 141.906703806775 43.5282096435145, 141.905123984444 43.5296905405461)) ^^http://www.opengis.net/ont/geosparql#wktLiteral