メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.768823887224 43.2029994847612, 141.768514798469 43.2033252814748, 141.768518917902 43.2033392942292, 141.768337348103 43.2035268390627, 141.767588629541 43.2031406265812, 141.767428715885 43.2033046219547, 141.767153618157 43.2031629270867, 141.767503731285 43.2028169821737, 141.767835013972 43.2024810832452, 141.768823887224 43.2029994847612)) ^^http://www.opengis.net/ont/geosparql#wktLiteral