メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.355626002402 43.0594389621072, 141.355484101585 43.0600030923498, 141.353887911455 43.0597929013866, 141.354036118964 43.059218201852, 141.354194190112 43.058644353478, 141.355778764512 43.058853254491, 141.355626002402 43.0594389621072)) ^^http://www.opengis.net/ont/geosparql#wktLiteral