[Standards] SIFT

Jiří Zárevúcky zarevucky.jiri at gmail.com
Sat May 16 12:45:05 UTC 2009

Hello. The filtering/intercepting functionality seems nice for IQ
stanzas, but I have doubts about some of the use cases.

"Invisibility" as defined by this spec would certainly ease it's
handling by both client and server, but is changes the meaning of
available and unavailable presence stanzas. That means servers that
support SIFT will understand them differently than servers that do
not. Also, if I understand it correctly, the empty sift query means
"don't filter anything" and not "send me all now". If you use it as an
"on" switch, you are overloading it's functionality.

The second (possible) problem is that when you use it to filter
messages (which you can do by negative priority), your contacts
wouldn't know it. If you have negative priority, everyone sees you
can't receive messages. That is not the case here. I think the spec
should at least define an error response to notify sender the entity
can't receive messages.

And to be complete, I'd appreciate an example of "excepting" multiple
payload types for IQ's. Thanks :)

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