Backup source of iTIP (No. 1)

• Backup list
• View the diff.
• View the diff current.
• View the diff for visual.
• View the backup.
• Go to iTIP.
  • 1 (2014-10-16 (Thu) 15:49:14)

-  iCalendar Transport-Independent Interoperability Protocol  (iTIP) Scheduling Events, BusyTime, To-dos and Journal Entries
--  https://www.ietf.org/rfc/rfc2446.txt