メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.752240819188 43.1940601426461, 141.751563306998 43.1947446552395, 141.750662708778 43.1942927422768, 141.751313250884 43.1936272479136, 141.751642286524 43.193779673969, 141.752240819188 43.1940601426461)) ^^http://www.opengis.net/ont/geosparql#wktLiteral