[Standards] Some questions on MUC / XEP-0045

Dave Cridland dave at cridland.net
Thu May 15 07:22:03 UTC 2014


On 14 May 2014 21:53, Christian Schudt <christian.schudt at gmx.de> wrote:

> Hi,
>
> I have some questions on MUC:
>
> 1. Shouldn't the (initial) room subject message have Delayed Delivery,
> because the subject was set some time ago? It probably should, but the spec
> doesn't mention anything about it (7.2.16 Room Subject).
>
>
The room subject is a property of the room, rather than an event like a
traditional message. It might even be sent from the room's own jid, rather
than the occupant jid. I think most implementations treat it semantically
as ongoing state rather than a message, but I don't think a delay element
is wrong. I'd be curious to see what clients would do with it, though,
before recommending it.


> 2. Is the <actor/> actually needed in the muc#admin namespace? There are
> no examples, but it's in the XML schema.
>
>
Yes, see http://xmpp.org/extensions/xep-0045.html#example-90


> 3. Can a client request multiple affiliations and get all affiliated
> users? Like:
>
> <query xmlns="http://jabber.org/protocol/muc#admin">
> <item affiliation="member"/>
> <item affiliation="owner"/>
> <item affiliation="admin"/>
> </query>
>
> Which would return all members.
>
>
It's not against the schema, of course, but I think that's there for
multiple modifications - something I actually think is a bad idea. I don't
see any support for it in the text, though.

You can, of course, just send three <iq/>'s pipelined; it'll give you the
same number of round-trip waits.


> 4. muc#roomconfig_whois config option: Is it used for roles or
> affiliations or both? The description says "affiliations", but the sample
> includes "moderators", which is a role. Can an implementation freely choose
> the possible options?
>
>
I think it has to be roles, really - that is, the use of "Affiliations" in
the registry submission is an error.

This generally controls whether real jids are included in presence.


>
> Thanks for answer.
>
> -- Christian
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