メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.409854787029 43.7393974056636, 142.409888310275 43.7398990999327, 142.407776994498 43.7400190794407, 142.405872191104 43.7401158569261, 142.405836171515 43.7396166601936, 142.405804116261 43.739131364763, 142.406724023067 43.7390809154383, 142.407696822588 43.7390290680106, 142.409802388684 43.7388971964073, 142.409854787029 43.7393974056636)) ^^http://www.opengis.net/ont/geosparql#wktLiteral