メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.3125000 28.3333333, 129.3187500 28.3333333, 129.3187500 28.3375000, 129.3125000 28.3375000, 129.3125000 28.3333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral