メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.382439287892 43.7600992866639, 142.382753590339 43.7606540435847, 142.381259718336 43.7610739406938, 142.380959058128 43.7605459559206, 142.380662698971 43.7600089476879, 142.382146861242 43.7595785219174, 142.3821531809 43.7595901711698, 142.382439287892 43.7600992866639)) ^^http://www.opengis.net/ont/geosparql#wktLiteral