メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.419429963273 43.7473611044242, 142.420084167019 43.7473236475232, 142.420097371843 43.7475471082468, 142.420171902357 43.7483201081211, 142.418832045691 43.7483916218536, 142.418786833913 43.7480331902447, 142.418783386484 43.7479965409939, 142.418750774676 43.7476903585291, 142.419209505972 43.7473734529116, 142.419429963273 43.7473611044242)) ^^http://www.opengis.net/ont/geosparql#wktLiteral