メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.354899200152 43.0697419204903, 141.354896127849 43.0697552583807, 141.353072674853 43.0695086726355, 141.353389771385 43.0683796260145, 141.355150867323 43.0686310649208, 141.355077356977 43.0689826302603, 141.355064271448 43.0690380875878, 141.354957464757 43.0694889786074, 141.354899200152 43.0697419204903)) ^^http://www.opengis.net/ont/geosparql#wktLiteral