メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.7750000 26.2833333, 127.7812500 26.2833333, 127.7812500 26.2875000, 127.7750000 26.2875000, 127.7750000 26.2833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral