メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.349634106121 44.4810879249172, 142.349610042865 44.4811385009904, 142.349586751205 44.4811874599751, 142.348709216392 44.4809751757941, 142.348750284554 44.4808935422599, 142.349102204487 44.4801939047332, 142.349956049049 44.4804202680857, 142.349921307121 44.4804921585237, 142.349683184508 44.480984768508, 142.349634106121 44.4810879249172)) ^^http://www.opengis.net/ont/geosparql#wktLiteral