メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.3125000 28.1666667, 129.3187500 28.1666667, 129.3187500 28.1708334, 129.3125000 28.1708334, 129.3125000 28.1666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral