メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.381841334418 43.7590057519573, 142.382146861242 43.7595785219174, 142.380662698971 43.7600089476879, 142.380363571399 43.759434918311, 142.380036530425 43.7588714141489, 142.381520665941 43.7584502618378, 142.381841334418 43.7590057519573)) ^^http://www.opengis.net/ont/geosparql#wktLiteral