メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.342633534185 43.0915422448442, 141.342124311909 43.0914740615668, 141.341098570637 43.0913252523142, 141.341471765028 43.0899492140378, 141.342987580197 43.0901609862174, 141.34293888651 43.0903589262798, 141.342803803704 43.0908704097326, 141.342710610706 43.09126147082, 141.342633534185 43.0915422448442)) ^^http://www.opengis.net/ont/geosparql#wktLiteral