メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.3125000 34.3125000, 129.3187500 34.3125000, 129.3187500 34.3166667, 129.3125000 34.3166667, 129.3125000 34.3125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral