メタデータ名 obsType-concealing
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.7312500 33.1083333, 131.7375000 33.1083333, 131.7375000 33.1125000, 131.7312500 33.1125000, 131.7312500 33.1083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral