メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.420514139137 43.751749969279, 142.420530923381 43.7518884946503, 142.420577828408 43.7522193206638, 142.419293519928 43.752436518342, 142.419260455594 43.7523038526105, 142.419222987853 43.7518290638532, 142.419177965954 43.7513541294823, 142.419819716229 43.7513096578613, 142.420469140912 43.7512869188607, 142.420514139137 43.751749969279)) ^^http://www.opengis.net/ont/geosparql#wktLiteral