メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.315969101498 42.2824962735459, 143.315430112037 42.2831310808338, 143.31539776862 42.2831735836416, 143.314958372246 42.2829898580279, 143.315017266752 42.2829545646344, 143.31541036414 42.2826673155577, 143.315696103075 42.2823835952054, 143.315969101498 42.2824962735459)) ^^http://www.opengis.net/ont/geosparql#wktLiteral