メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.370660512086 43.0699240364818, 141.370527375087 43.0704530864283, 141.370517753661 43.0704885998701, 141.369564199502 43.0701211117963, 141.369364327203 43.0697161645593, 141.368998111519 43.0694991236681, 141.369050664012 43.069185577397, 141.369074043315 43.0691338535054, 141.369541869888 43.0691749389136, 141.370660512086 43.0699240364818)) ^^http://www.opengis.net/ont/geosparql#wktLiteral