メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.751760702269 43.1917517841589, 141.751338996124 43.1915313693216, 141.750675458816 43.1911875271683, 141.75144495963 43.1903738057413, 141.752031951537 43.1897749130495, 141.753115795295 43.1903147490118, 141.752671909794 43.1907854976002, 141.7523260839 43.191152233133, 141.751760702269 43.1917517841589)) ^^http://www.opengis.net/ont/geosparql#wktLiteral