メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.31863341072 43.0720521342571, 141.318323767582 43.0722914752516, 141.317936693038 43.0715880542893, 141.317767483056 43.0713024754851, 141.318633624653 43.0707326897665, 141.319084564349 43.0704297243006, 141.319420588289 43.0706271994116, 141.32002975862 43.0709873852608, 141.31863341072 43.0720521342571)) ^^http://www.opengis.net/ont/geosparql#wktLiteral