メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.396836466358 44.1612274536356, 142.395492524214 44.1610065251741, 142.39572161772 44.1601194447977, 142.395538430281 44.1600820218913, 142.395693811589 44.1594478595611, 142.396477090947 44.1597366576465, 142.397217348807 44.1600095779848, 142.396836466358 44.1612274536356)) ^^http://www.opengis.net/ont/geosparql#wktLiteral