@SuppressWarnings("rawtypes")
    public Enumeration getKeys() {
       return propResBundle.getKeys();
    }
This method returns an enumerated handle of the keys
which correspond to values translated to various locales.

@return an enumeration of keys which have messages tranlated to
corresponding locales.
src/main/java/org/replicadb/rowset/sun/rowset/JdbcRowSetResourceBundle.java