メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.9750000 26.5666667, 127.9812500 26.5666667, 127.9812500 26.5708334, 127.9750000 26.5708334, 127.9750000 26.5666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral