メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.41128335131 43.8321566626428, 142.410510917175 43.8327556339468, 142.408840024278 43.8339323020479, 142.407225778496 43.832736083275, 142.408844821146 43.8315595258651, 142.40968391541 43.8309604550498, 142.41128335131 43.8321566626428)) ^^http://www.opengis.net/ont/geosparql#wktLiteral