メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.786054484418 43.6384632936173, 142.78736472488 43.6384180360592, 142.803683224515 43.6379019818055, 142.853956735703 43.6635517104189, 142.807686652516 43.6710403957243, 142.771684876337 43.6572971754403, 142.701156557229 43.6483098522094, 142.75053733151 43.6396835902737, 142.786054484418 43.6384632936173)) ^^http://www.opengis.net/ont/geosparql#wktLiteral