メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.974151311651 43.5372376025861, 144.974473461283 43.5374537433025, 144.974410244216 43.5375052127856, 144.973577289669 43.5381844205799, 144.973234891562 43.5379565604437, 144.97287136504 43.5377145055856, 144.973812664819 43.5371057453557, 144.973879196948 43.537054970313, 144.974151311651 43.5372376025861)) ^^http://www.opengis.net/ont/geosparql#wktLiteral