メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.744936785976 43.2034797800774, 141.745424165866 43.2037230101743, 141.744096687991 43.2051425670846, 141.743631025883 43.2049171503813, 141.743177692295 43.2046720242299, 141.744512867984 43.2032587708625, 141.744936785976 43.2034797800774)) ^^http://www.opengis.net/ont/geosparql#wktLiteral