メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.987979857865 43.5527491511754, 144.987539133999 43.5524583293412, 144.987587358686 43.5524173027698, 144.987660662491 43.5523579552436, 144.988527989313 43.5516557406137, 144.988945888089 43.5519549468018, 144.987979857865 43.5527491511754)) ^^http://www.opengis.net/ont/geosparql#wktLiteral