メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((138.24897198415 34.8563393788443, 138.248854612768 34.8565668339119, 138.24870445635 34.8567081562357, 138.248668613272 34.8561692230932, 138.248582154282 34.8557421688384, 138.248941481396 34.8556722050501, 138.249257236542 34.8557865353581, 138.24897198415 34.8563393788443)) ^^http://www.opengis.net/ont/geosparql#wktLiteral