メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.905770029242 43.4771671620659, 141.906065944431 43.4781513980068, 141.905670940731 43.4782072494863, 141.905181590983 43.4782746294128, 141.905078439056 43.4779484000154, 141.904880675194 43.4772765220773, 141.904647722759 43.4764850592406, 141.904584311749 43.4762640505116, 141.90546053096 43.4761229013139, 141.905770029242 43.4771671620659)) ^^http://www.opengis.net/ont/geosparql#wktLiteral