メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.905681560755 43.4864905662431, 141.904756475959 43.4866268269552, 141.904305089785 43.4850812971475, 141.905197105822 43.484948142408, 141.905322130218 43.4852937414655, 141.905347626603 43.4852898445882, 141.905703527957 43.4864873265778, 141.905681560755 43.4864905662431)) ^^http://www.opengis.net/ont/geosparql#wktLiteral