メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.744069407373 43.2030240295535, 141.744512867984 43.2032587708625, 141.743177692295 43.2046720242299, 141.742743956788 43.2044406974667, 141.742273946426 43.2041959854436, 141.74362164294 43.2027869467984, 141.744069407373 43.2030240295535)) ^^http://www.opengis.net/ont/geosparql#wktLiteral