メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.395965568062 44.1874246969366, 142.395885982476 44.1876938094056, 142.395753312499 44.1881423846838, 142.394767141778 44.1880026495052, 142.394648305225 44.1879850090095, 142.39488782035 44.1872514677889, 142.395105245641 44.1865860370678, 142.396170307286 44.1867567854268, 142.395965568062 44.1874246969366)) ^^http://www.opengis.net/ont/geosparql#wktLiteral