[1] RFC 3340 - The Application Exchange Core (2016-02-21 19:44:34 +09:00 版) https://tools.ietf.org/html/rfc3340

[2] RFC 3341 - The Application Exchange (APEX) Access Service (2016-02-28 20:34:31 +09:00 版) https://tools.ietf.org/html/rfc3341

[3] RFC 3342 - The Application Exchange (APEX) Option Party Pack, Part Deux! (2016-02-28 20:34:31 +09:00 版) https://tools.ietf.org/html/rfc3342

[4] RFC 3343 - The Application Exchange (APEX) Presence Service (2016-03-06 17:42:32 +09:00 版) https://tools.ietf.org/html/rfc3343

[5] BEEP