This XEP provides some useful optional extensions to Multi-User Chat (XEP-0045) [1].
STRONGLY RECOMMENDED.
An entity may wish to discover if a service implements the Multi-User Chat protocol and the optional extensions defined in this XEP; in order to do so, it sends a service discovery information ("disco#info") query to the MUC service's JID.
<iq from='hag66@shakespeare.lit/pda'
id='lx09df27'
to='chat.shakespeare.lit'
type='get'>
<query xmlns='http://jabber.org/protocol/disco#info'/>
</iq>The service MUST return its identity and the features it supports.
<iq from='chat.shakespeare.lit'
id='lx09df27'
to='hag66@shakespeare.lit/pda'
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'/>
<feature var='urn:xmpp:muc:mid'/>
<feature var='urn:xmpp:muc:pmtag'/>
</query>
</iq>If the MUC service announces support for the 'urn:xmpp:muc:mid' feature, then he MUST handle the <message-id/> element as defined in TODO XEP-MID. Client can send messages with the <message-id/> extension element. Message Stanzas send from the MUC service to MUC participants MUST contain a unique and stable message ID witin <message-id/> element.
<message xmlns='jabber:client'
to='room@muc.example.org'
type='groupchat'>
<body>Typical body text</body>
<message-id xmlns='urn:xmpp:mid:0' client-id='de305d54-75b4-431b-adb2-eb6b9e546013'/>
</message>The server MAY override the ID. If so, the "message-id" element MUST contain an "id" and a "client-id" attribute.
<message xmlns='jabber:client'
to='room@muc.example.org'
type='groupchat'>
<body>Typical body text</body>
<message-id xmlns='urn:xmpp:mid:0'
id='new-id-overrides-client-id'
client-id='de305d54-75b4-431b-adb2-eb6b9e546013'/>
</message>Otherwise, if the server does not override the ID, he MAY omit the "client-id" attribute.
If the MUC service announces support for the 'urn:xmpp:muc:pmtag' feature, then he MUST tag private MUC messages with a <x/> element qualified by the 'http://jabber.org/protocol/muc#user' namespace before sending it to the recipient (see XEP-45 § 7.5 Sending a Private Message).
<message
from='coven@chat.shakespeare.lit/firstwitch'
id='hgn27af1'
to='crone1@shakespeare.lit/desktop'
type='chat'>
<body>I'll give thee a wind.</body>
<x xmlns='http://jabber.org/protocol/muc#user'/>
</message>This allows clients receiving the message by e.g. carbon copies to determine that it's a MUC private message.
TODO: Provide a method to query if client is considered to be an occupant of a MUC by the MUC service.
OPTIONAL.
OPTIONAL.
OPTIONAL.
OPTIONAL.
REQUIRED.
REQUIRED.
REQUIRED.
REQUIRED for protocol specifications.
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The Extensible Messaging and Presence Protocol (XMPP) is defined in the XMPP Core (RFC 6120) and XMPP IM (RFC 6121) specifications contributed by the XMPP Standards Foundation to the Internet Standards Process, which is managed by the Internet Engineering Task Force in accordance with RFC 2026. Any protocol defined in this document has been developed outside the Internet Standards Process and is to be understood as an extension to XMPP rather than as an evolution, development, or modification of XMPP itself.
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The following requirements keywords as used in this document are to be interpreted as described in RFC 2119: "MUST", "SHALL", "REQUIRED"; "MUST NOT", "SHALL NOT"; "SHOULD", "RECOMMENDED"; "SHOULD NOT", "NOT RECOMMENDED"; "MAY", "OPTIONAL".
1. 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/
First draft.
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