[Council] Message threads

[Peter Saint-Andre]

Ian Paterson wrote:
> Hi,
> 
> I made a few changes to the CVS copy of XEP-0201 ( 
> http://www.jabberstudio.org/cgi-bin/viewcvs.cgi/cvs/xmpp/extensions/xep-0201.xml?r1=1.5&r2=1.6 
> ).
> 
> Going forward, the concept of a (chat) session is going to be 
> fundamental to most clients. So I think we can specify that all messages 
> of type 'chat' SHOULD include a thread element.

RECOMMENDED and SHOULD are equivalent terms.

> Clients that aren't going to implement formal sessions can easily 
> facilitate those that will, but we can't force legacy clients to include 
> thread IDs so I also added:
> 
> If a client receives a message of type 'chat' without a thread ID then:
> 1. If the receiving client has no sessions open with the message sender 
> (full JID), or if all the open sessions have already _received_ a 
> message that included the session's thread ID, then the receiver should 
> create a new session with a new thread ID (and include that thread ID in 
> all the messages it sends within the session).
> 2. If the receiver has a session open with the sender for which it has 
> not received a message including the session's thread ID, then it should 
> consider the message to be part of that session. If more than one such 
> sessions exist, then the message should be considered part of the 
> session in which the receiver last sent a message.
> 
> Another new paragraph:
> If an entity receives an XMPP presence stanza of type 'unavailable' from 
> the other entity during a chat session, it SHOULD NOT destroy the 
> thread, it SHOULD assume the other entity will still be able to continue 
> the session (perhaps the other entity simply became "invisible", or was 
> temporarily disconnected by a network error, or it is persisting the 
> state of the session until it reconnects and receives "offline" messages).
> 
> Finally, session termination stanzas (as defined in XEP-0155) may be 
> used to terminate a session even if the session was not negotiated with 
> XEP-0155:
> 
> <message type='normal' from='juliet at capulet.com/balcony' 
> to='romeo at montague.net/orchard'>
> <thread>ffd7076498744578d10edabfe7f4a866</thread>
> <feature xmlns='http://jabber.org/protocol/feature-neg'>
> <x xmlns='jabber:x:data' type='submit'>
> <field var='FORM_TYPE'>
> <value>urn:xmpp:chatneg</value>
> </field>
> <field var='terminate'>
> <value>1</value>
> </field>
> </x>
> </feature>
> </message>
> 
> Let me know if there are objections etc.

Those changes are fine with me.

> Peter, there may be a few more suggestions over the coming week, so we 
> could hold off publishing for now.

OK

Peter

-- 
Peter Saint-Andre
XMPP Standards Foundation
http://www.xmpp.org/xsf/people/stpeter.shtml

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