メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.337065548651 43.7581184425132, 142.337793448405 43.7583521871424, 142.337498764303 43.7588836037506, 142.337160889319 43.759462431041, 142.33637956041 43.7592218510235, 142.33561180707 43.7589763128861, 142.33595237646 43.7584037817209, 142.336245056996 43.7578956294773, 142.337065548651 43.7581184425132)) ^^http://www.opengis.net/ont/geosparql#wktLiteral