メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.753136790569 43.1945265803365, 141.75282799709 43.1948580342373, 141.752490676445 43.1952100391794, 141.751584080795 43.1947550844247, 141.751563306998 43.1947446552395, 141.752240819188 43.1940601426461, 141.752294204388 43.1940852002945, 141.75274813415 43.1942934443081, 141.753175349317 43.1944894036116, 141.753136790569 43.1945265803365)) ^^http://www.opengis.net/ont/geosparql#wktLiteral