メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.2750000 33.5291667, 131.2812500 33.5291667, 131.2812500 33.5333333, 131.2750000 33.5333333, 131.2750000 33.5291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral