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... subject/> element MAY be
included for the purpose of providing alternate versions of the same
subject ...
... specifying content that extends the meaning of the message (e.g., an
XHTML-formatted version of the message body), and an IQ stanza MAY
...
... Jabber open-source
community in 1999. This community was founded by Jeremie Miller, who
released source code for the initial version of the jabberd server in
January 1999. Major early contributors to the base protocol also
...