*  @param end what timestamp to end. Use null to not specify one.
     *  @throws IOException if something goes wrong
     *  @throws IllegalArgumentException if start &lt; end
     *  @return the specified log entries
     *  @since 0.08
     */
    public Wiki.LogEntry[] getLogEntries(Calendar start, Calendar end) throws IOException
    {
        return getLogEntries(start, end, Integer.MAX_VALUE, ALL_LOGS, "", null, "", ALL_NAMESPACES);
    }