メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.7750000 26.2250000, 127.7812500 26.2250000, 127.7812500 26.2291667, 127.7750000 26.2291667, 127.7750000 26.2250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral