メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.404083055747 44.160788717085, 142.403094163815 44.1606370505927, 142.403585285904 44.159153130127, 142.404560833207 44.159289921416, 142.404083055747 44.160788717085)) ^^http://www.opengis.net/ont/geosparql#wktLiteral