メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.913811943895 43.5198192011451, 141.913075246515 43.5199379982573, 141.912612777693 43.5184437586506, 141.913037766593 43.5183766883497, 141.913249945206 43.5183431697035, 141.91339357105 43.5183859269599, 141.913804002336 43.5197919963257, 141.913811943895 43.5198192011451)) ^^http://www.opengis.net/ont/geosparql#wktLiteral