メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.857800248278 43.3264356436093, 141.858007539831 43.3271827422682, 141.857206992352 43.3273095485166, 141.856979879461 43.3265787675839, 141.856646779778 43.3253505454404, 141.857456251148 43.3252187080192, 141.857800248278 43.3264356436093)) ^^http://www.opengis.net/ont/geosparql#wktLiteral