[JDEV] Jabber Message Expiration: "jabber:x:expire"

[Dixon Canario]

Hi Does anyone knows if the below message expire reference
.  Is a feature part of the 1.4 release, a 
future release or a previews one??

thanks, in advance.

Dixon C.

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jabber:x:expire
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This extension is a simple flag identifying that a message
has a limited lifetime. If the message is stored offline,
the server will not deliver the message and simply delete
it after the expiration time has passed. A client may also
optionally support removing the message after expiration if
it has been received but not yet been viewed. The seconds
attribute is always relative to the time in which the
message was sent/received (now). The server will adjust the
value if it was stored for some time but not expired on the
server.

<x xmlns="jabber:x:expire" seconds="3600"/>
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