メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.393383295056 44.1825243435332, 142.392266184199 44.1823373379711, 142.392683498703 44.1810058371429, 142.393781047006 44.1811846729733, 142.393512995104 44.1821231847023, 142.393383295056 44.1825243435332)) ^^http://www.opengis.net/ont/geosparql#wktLiteral