メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.766243730603 42.8996565711826, 140.766340612639 42.9007682331778, 140.764267817573 42.9008614960377, 140.764209390826 42.9008643228603, 140.764128718234 42.8999320770131, 140.76399297888 42.8983642274596, 140.766124448824 42.898258013923, 140.766243730603 42.8996565711826)) ^^http://www.opengis.net/ont/geosparql#wktLiteral