メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.5250000 31.2083333, 130.5312500 31.2083333, 130.5312500 31.2125000, 130.5250000 31.2125000, 130.5250000 31.2083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral