メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.905417331219 43.4914001340638, 141.905080768457 43.4914532034887, 141.904650357732 43.4915116857137, 141.904326243973 43.4904190363943, 141.904803596938 43.4903549996744, 141.90508938206 43.4902875363385, 141.905417331219 43.4914001340638)) ^^http://www.opengis.net/ont/geosparql#wktLiteral