メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.327944643083 43.7566246490589, 142.328261174866 43.7567130035093, 142.32856831142 43.7567990952132, 142.327919546472 43.7578911855636, 142.327315872743 43.7577072823286, 142.326758116901 43.7575376730244, 142.32744947125 43.7564978275953, 142.327631244558 43.7565385778649, 142.327944643083 43.7566246490589)) ^^http://www.opengis.net/ont/geosparql#wktLiteral