メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.355357708688 43.081602454614, 141.353798162483 43.0814007049522, 141.354076310677 43.0802689741909, 141.355644109079 43.0804753567314, 141.355560436776 43.0807988478352, 141.355496719306 43.0810433740077, 141.355357708688 43.081602454614)) ^^http://www.opengis.net/ont/geosparql#wktLiteral