メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.331787006247 43.7655108857404, 142.331008793896 43.7652775700832, 142.331671512945 43.764178379624, 142.332434618553 43.7644208795334, 142.331862489423 43.7653731251945, 142.331787006247 43.7655108857404)) ^^http://www.opengis.net/ont/geosparql#wktLiteral