The Mediated Information eXchange (MIX) protocol framework and core capabilities are specified in Mediated Information eXchange (MIX) (XEP-0369) [1] (MIX-CORE). MIX can be used independently of Multi-User Chat (XEP-0045) [2] (MUC).
It may be desirable to operate a service that provides MIX and MUC together. This specification specifies three options for achieving this.
If both MIX and MUC are implemented, three approaches are noted.
The fully integrated approach would be transparent to clients. The following example shows how a service that supports MIX and MUC in a fully integrated manner would respond following the specification of Mediated Information eXchange (MIX) (XEP-0369) [1]:
<iq from='hag66@shakespeare.example/UUID-c8y/1573'
id='lx09df27'
to='mix.shakespeare.example'
type='get'>
<query xmlns='http://jabber.org/protocol/disco#info'>
</iq>
<iq from='mix.shakespeare.example'
id='lx09df27'
to='hag66@shakespeare.example/UUID-c8y/1573'
type='result'>
<query xmlns='http://jabber.org/protocol/disco#info'>
<identity
category='conference'
name='Shakespearean Chat Service'
type='text'/>
<feature var='urn:xmpp:mix:core:1'/>
<feature var='http://jabber.org/protocol/muc'/>
<feature var='urn:xmpp:mix:core:1#searchable'/>
</query>
</iq>
In the fully integrated service item discovery on the MIX/MUC service determines a list of channels. The protocol used for this is the same in MUC and MIX. Discovery actions on a channel in MIX MUST use 'node=mix' attribute in the discovery which will lead to the return of MIX channel specific information, as mandated for this discovery in Mediated Information eXchange (MIX) (XEP-0369) [1]. If is not set, MUC room specific information is returned.
For the partially integrated service, MIX servers will reference the associated MUC server and MUC servers will reference the associated MIX service. This will allow a client that only support MUC or only supports MIX to find the right server if it is given a reference to the other one. For a client that supports both MUC and MIX, it will enable the client to select its preferred service. For a MIX client, it will also be useful to know the MUC service, so that this information can be shared with a MUC client invitation. The following example shows how a MIX server identifies the associated MUC server. Note that MUC MUST NOT be advertized as a feature:
<iq from='hag66@shakespeare.example/UUID-c8y/1573'
id='lx09df27'
to='mix.shakespeare.example'
type='get'>
<query xmlns='http://jabber.org/protocol/disco#info'/>
</iq>
<iq from='mix.shakespeare.example'
id='lx09df27'
to='hag66@shakespeare.example/UUID-c8y/1573'
type='result'>
<query xmlns='http://jabber.org/protocol/disco#info'>
<identity
category='conference'
name='Shakespearean Chat Service'
type='text'/>
<feature var='urn:xmpp:mix:core:1'/>
<x xmlns='jabber:x:data' type='result'>
<field var='FORM_TYPE' type='hidden'>
<value>urn:xmpp:mix:muc:0#muc-mirror</value>
</field>
<field var='muc-mirror'
type='jid-single'
label='Location of MUC mirror service'>
<value>chat.shakespeare.example</value>
</field>
</x>
</query>
</iq>
The result is returned in an extended disco results in a form whose type value is 'urn:xmpp:mix:muc:0#muc-mirror'. The field with var='muc-mirror' is the value of which is the mirrored MUC domain's JID.
Similarly, a MUC service can advertise an associated MIX doming. The following example shows discovery of a MUC domain. Note that MIX MUST NOT be advertized as a feature
<iq from='hag66@shakespeare.example/UUID-c8y/1573'
id='lx09df27'
to='mix.shakespeare.example'
type='get'>
<query xmlns='http://jabber.org/protocol/disco#info'>
</iq>
<iq from='chat.shakespeare.example'
id='lx09df27'
to='hag66@shakespeare.example/UUID-c8y/1573'
type='result'>
<query xmlns='http://jabber.org/protocol/disco#info'>
<identity
category='conference'
name='Shakespearean Chat Service'
type='text'/>
<feature var='http://jabber.org/protocol/muc'/>
<x xmlns='jabber:x:data' type='result'>
<field var='FORM_TYPE' type='hidden'>
<value>urn:xmpp:mix:muc:0#mix-mirror</value>
</field>
<field var='mix-mirror'
type='jid-single'
label='Location of MUC mirror service'>
<value>mix.shakespeare.example</value>
</field>
</x>
</query>
</iq>
The result is returned in an extended disco results in a form whose type value is 'urn:xmpp:mix:muc:0#mux-mirror'. The field with var='mix-mirror' is the value of which is the mirrored MIX domain's JID.
Where a client supports MUC and MIX and has determined that for a channel that the server also supports a MUC room, the client has a choice as to which type of invite to send. This SHOULD be done by determining if the client support MIX using the mechanism specified in Mediated Information eXchange (MIX) (XEP-0369) [1]. If the client supports MIX a MIX invite SHOULD be sent.
See considerations in Mediated Information eXchange (MIX) (XEP-0369) [1].
See considerations in Mediated Information eXchange (MIX) (XEP-0369) [1].
When converting a 1:1 conversation to a channel there is potential to expose sensitive information and to present invalid information.
None.
The urn:xmpp:mix namespace needs to be registered.
To be supplied when MIX progresses to proposed standard.
See Mediated Information eXchange (MIX) (XEP-0369) [1] for a list of contributors to the MIX Family of specifications.
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1. XEP-0369: Mediated Information eXchange (MIX) <https://xmpp.org/extensions/xep-0369.html>.
2. XEP-0045: Multi-User Chat <https://xmpp.org/extensions/xep-0045.html>.
Note: Older versions of this specification might be available at http://xmpp.org/extensions/attic/
Fix reference to MIX-CORE namespaces
Split out from MIX 0.10.0;
END