メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.403629425466 44.1623028912074, 142.40261968925 44.162136359121, 142.403094163815 44.1606370505927, 142.404083055747 44.160788717085, 142.403629425466 44.1623028912074)) ^^http://www.opengis.net/ont/geosparql#wktLiteral