メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.913478345458 43.5216331537873, 141.913057645328 43.5216986934245, 141.912269641975 43.5218202900587, 141.911845374359 43.5201402907129, 141.913075246515 43.5199379982573, 141.913570354633 43.521618795923, 141.913478345458 43.5216331537873)) ^^http://www.opengis.net/ont/geosparql#wktLiteral