メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.426461356889 43.0559751955956, 141.427419929469 43.0561768970513, 141.427058466433 43.0566430517681, 141.426777312182 43.0570417028713, 141.426210557725 43.0578908755261, 141.425458084966 43.0576665947582, 141.424767007212 43.0574632169538, 141.425687538929 43.0558139889527, 141.425741916453 43.0558355499629, 141.426398906296 43.0559620867397, 141.426461356889 43.0559751955956)) ^^http://www.opengis.net/ont/geosparql#wktLiteral