メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.2750000 28.0791667, 129.2812500 28.0791667, 129.2812500 28.0833333, 129.2750000 28.0833333, 129.2750000 28.0791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral