メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.381226143486 43.7579013686333, 142.381513300877 43.7584374886009, 142.381520665941 43.7584502618378, 142.380036530425 43.7588714141489, 142.379731394541 43.7583332010825, 142.37944558221 43.7578019801306, 142.380941254679 43.757358968895, 142.381226143486 43.7579013686333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral