メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.770700172485 43.1943935101692, 141.771090390228 43.1945898121449, 141.770649446457 43.1950245622019, 141.770303664126 43.194843143509, 141.770013770326 43.1946940980018, 141.769743947168 43.1945657424368, 141.770289916437 43.1940251709264, 141.770373917019 43.1939217902181, 141.770909112429 43.1941940909588, 141.770700172485 43.1943935101692)) ^^http://www.opengis.net/ont/geosparql#wktLiteral