メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.395575832516 44.1886830067668, 142.395456547262 44.1890527404211, 142.394483275235 44.1889137587983, 142.394601938518 44.1885328825226, 142.394767141778 44.1880026495052, 142.395753312499 44.1881423846838, 142.395742280736 44.188175974023, 142.395575832516 44.1886830067668)) ^^http://www.opengis.net/ont/geosparql#wktLiteral