メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.9812500 26.3708334, 127.9875000 26.3708334, 127.9875000 26.3750000, 127.9812500 26.3750000, 127.9812500 26.3708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral