メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.752031951537 43.1897749130495, 141.75144495963 43.1903738057413, 141.750675458816 43.1911875271683, 141.749853410325 43.1907457948675, 141.749709256872 43.1906783531305, 141.750466024181 43.1898772419102, 141.751018009821 43.1892696216654, 141.751085688099 43.189303323957, 141.752031951537 43.1897749130495)) ^^http://www.opengis.net/ont/geosparql#wktLiteral