メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.355211228659 43.0821735024855, 141.355067385997 43.0827542759683, 141.354520828371 43.0826778399166, 141.354047560998 43.0826155488428, 141.353515432768 43.0825432287004, 141.353593278762 43.0822385425716, 141.35366633582 43.0819529473693, 141.35372938732 43.0816888651775, 141.353798162483 43.0814007049522, 141.355357708688 43.081602454614, 141.355211228659 43.0821735024855)) ^^http://www.opengis.net/ont/geosparql#wktLiteral