メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.866247898735 43.3451229799914, 141.86592069989 43.3452051487921, 141.864298282063 43.3454735422822, 141.863849494293 43.3439899011195, 141.865821335472 43.3437079853306, 141.866247898735 43.3451229799914)) ^^http://www.opengis.net/ont/geosparql#wktLiteral