メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.755762746523 43.1896519678966, 141.756258561499 43.1898424455846, 141.75493123581 43.1912558647235, 141.754902376528 43.1912470197407, 141.754466448528 43.1910250779565, 141.754361498883 43.1909702598539, 141.753992422814 43.1907842614492, 141.754671694166 43.190074567442, 141.755237752053 43.1894570022096, 141.755762746523 43.1896519678966)) ^^http://www.opengis.net/ont/geosparql#wktLiteral