メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.405161329789 44.1807100484915, 142.405017381416 44.181202192749, 142.403542185781 44.1809985231925, 142.402873993072 44.1809062658945, 142.403043510858 44.1803951043364, 142.403206322182 44.1799041503477, 142.403765583784 44.1799865148283, 142.405306559762 44.1802134722724, 142.405161900006 44.1807081144186, 142.405161329789 44.1807100484915)) ^^http://www.opengis.net/ont/geosparql#wktLiteral