メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.8062500 26.1666667, 127.8125000 26.1666667, 127.8125000 26.1708334, 127.8062500 26.1708334, 127.8062500 26.1666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral