メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.5750000 31.2166667, 130.5812500 31.2166667, 130.5812500 31.2208334, 130.5750000 31.2208334, 130.5750000 31.2166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral