mirror of
https://github.com/moparisthebest/xeps
synced 2024-12-21 23:28:51 -05:00
147 lines
6.7 KiB
XML
147 lines
6.7 KiB
XML
<?xml version='1.0' encoding='UTF-8'?>
|
|
<!DOCTYPE xep SYSTEM 'xep.dtd' [
|
|
<!ENTITY % ents SYSTEM 'xep.ent'>
|
|
%ents;
|
|
]>
|
|
<?xml-stylesheet type='text/xsl' href='xep.xsl'?>
|
|
<xep>
|
|
<header>
|
|
<title>Service Discovery Notifications</title>
|
|
<abstract>This specification defines a method for requesting and receiving notifications regarding XMPP service discovery items.</abstract>
|
|
&LEGALNOTICE;
|
|
<number>0230</number>
|
|
<status>Deferred</status>
|
|
<type>Standards Track</type>
|
|
<sig>Standards</sig>
|
|
<approver>Council</approver>
|
|
<dependencies>
|
|
<spec>XMPP Core</spec>
|
|
<spec>XEP-0030</spec>
|
|
<spec>XEP-0060</spec>
|
|
</dependencies>
|
|
<supersedes/>
|
|
<supersededby/>
|
|
<shortname>NOT YET ASSIGNED</shortname>
|
|
&hildjj;
|
|
&stpeter;
|
|
<revision>
|
|
<version>0.1.1</version>
|
|
<date>2016-10-04</date>
|
|
<initials>egp</initials>
|
|
<remark><p>Add forgotten namespace in example 3, and change the text to describe the correct element.</p></remark>
|
|
</revision>
|
|
<revision>
|
|
<version>0.1</version>
|
|
<date>2008-01-30</date>
|
|
<initials>psa</initials>
|
|
<remark><p>Initial published version.</p></remark>
|
|
</revision>
|
|
<revision>
|
|
<version>0.0.2</version>
|
|
<date>2008-01-06</date>
|
|
<initials>jjh/psa</initials>
|
|
<remark><p>Corrected example to use full JIDs and SubIDs.</p></remark>
|
|
</revision>
|
|
<revision>
|
|
<version>0.0.1</version>
|
|
<date>2008-01-03</date>
|
|
<initials>jjh/psa</initials>
|
|
<remark><p>First draft.</p></remark>
|
|
</revision>
|
|
</header>
|
|
|
|
<section1 topic='Introduction' anchor='intro'>
|
|
<p>&xep0115; defines a way for entities to receive dynamically-updated information about &xep0030; capabilities, rather than polling for updates by sending repeated disco#info requests. However, there is no comparable method for receiving updated disco#items information (this might be helpful when the number of associated entities is large or dynamic, e.g., at a multi-user chat service). This document specifies such a method by re-using semantics from &xep0060;.</p>
|
|
</section1>
|
|
|
|
<section1 topic='Protocol' anchor='protocol'>
|
|
<p>Before a requesting entity asks for service discovery items with notifications, it SHOULD send directed presence to the responding entity so that the responding entity knows when to stop sending notifications.</p>
|
|
<example caption='Requesting entity sends presence'><![CDATA[
|
|
<presence from='bill@shakespeare.lit/globe' to='chat.shakespeare.lit'/>
|
|
]]></example>
|
|
<p>The requesting entity then sends a disco#items request to the responding entity, including a <subscribe/> element qualified by the 'http://jabber.org/protocol/pubsub' namespace, which in turn specifies a node of 'http://jabber.org/protocol/disco#items'.</p>
|
|
<example caption='Requesting all items'><![CDATA[
|
|
<iq type='get'
|
|
from='bill@shakespeare.lit/globe'
|
|
to='chat.shakespeare.lit'
|
|
id='items1'>
|
|
<query xmlns='http://jabber.org/protocol/disco#items'>
|
|
<subscribe xmlns='http://jabber.org/protocol/pubsub'/>
|
|
</query>
|
|
</iq>
|
|
]]></example>
|
|
<p>If the responding entity does not recognize inclusion of the <subscribe/> element as a child of the <query/> element, it MUST return the service discovery items but MUST NOT send subsequent notifications to the requesting entity.</p>
|
|
<p>If the requesting entity did not share presence with the responding entity, the responding entity MUST return the service discovery items but SHOULD NOT send subsequent notifications to the requesting entity.</p>
|
|
<p>If the responding entity recognizes inclusion of the <subscribe/> element as a child of the <query/> element and the requesting entity is allowed to receive notifications, the responding entity MUST return the service discovery items (including a <subscription/> element) and SHOULD send subsequent notifications to the requesting entity.</p>
|
|
<example caption='Result-set for all items'><![CDATA[
|
|
<iq type='result'
|
|
from='chat.shakespeare.lit'
|
|
to='bill@shakespeare.lit/globe'
|
|
id='items1'>
|
|
<query xmlns='http://jabber.org/protocol/disco#items'>
|
|
<item jid='alls-well-that-ends-well@chat.shakespeare.lit'/>
|
|
<item jid='as-you-like-it@chat.shakespeare.lit'/>
|
|
<item jid='cleopatra@chat.shakespeare.lit'/>
|
|
<item jid='comedy-of-errors@chat.shakespeare.lit'/>
|
|
<item jid='coriolanus@chat.shakespeare.lit'/>
|
|
<item jid='cymbeline@chat.shakespeare.lit'/>
|
|
<item jid='hamlet@chat.shakespeare.lit'/>
|
|
<item jid='henry-the-fourth-one@chat.shakespeare.lit'/>
|
|
<item jid='henry-the-fourth-two@chat.shakespeare.lit'/>
|
|
<item jid='henry-the-fifth@chat.shakespeare.lit'/>
|
|
<subscription
|
|
xmlns='http://jabber.org/protocol/pubsub'
|
|
jid='bill@shakespeare.lit'
|
|
subid='some-long-sub-id'
|
|
subscription='subscribed'/>
|
|
</query>
|
|
</iq>
|
|
]]></example>
|
|
<p>The responding entity then SHOULD send subsequent notifications to the requesting entity when associated items are added to or deleted from the potential result set.</p>
|
|
<example caption='A notification (new item)'><![CDATA[
|
|
<message from='chat.shakespeare.lit' to='bill@shakespeare.lit' id='foo'>
|
|
<event xmlns='http://jabber.org/protocol/pubsub#event'>
|
|
<items node='http://jabber.org/protocol/disco#items'>
|
|
<item id='ae890ac52d0df67ed7cfdf51b644e901'>
|
|
<item xmlns='http://jabber.org/protocol/disco#items'
|
|
jid='henry-the-fifth@chat.shakespeare.lit'/>
|
|
</item>
|
|
</items>
|
|
</event>
|
|
</message>
|
|
]]></example>
|
|
<example caption='A notification (deleted item)'><![CDATA[
|
|
<message from='chat.shakespeare.lit' to='bill@shakespeare.lit' id='bar'>
|
|
<event xmlns='http://jabber.org/protocol/pubsub#event'>
|
|
<items node='http://jabber.org/protocol/disco#items'/>
|
|
<retract id='fa890ca52d0df67de7fcfd51b644c701'>
|
|
<item xmlns='http://jabber.org/protocol/disco#items'
|
|
jid='cardenio@chat.shakespeare.lit'/>
|
|
</retract>
|
|
</items>
|
|
</event>
|
|
</message>
|
|
]]></example>
|
|
<p>When the requesting entity goes offline, the responding entity will receive unavailable presence.</p>
|
|
<example caption='Responding entity receives unavailable presence'><![CDATA[
|
|
<presence from='bill@shakespeare.lit/globe'
|
|
to='chat.shakespeare.lit'
|
|
type='unavailable'/>
|
|
]]></example>
|
|
<p>The responding entity then MUST NOT send further notifications.</p>
|
|
</section1>
|
|
|
|
<section1 topic='Security Considerations' anchor='security'>
|
|
<p>This document introduces no new security considerations above and beyond those already defined for service discovery and publish-subscribe.</p>
|
|
</section1>
|
|
|
|
<section1 topic='IANA Considerations' anchor='iana'>
|
|
<p>This document requires no interaction with &IANA;.</p>
|
|
</section1>
|
|
|
|
<section1 topic='XMPP Registrar Considerations' anchor='registrar'>
|
|
<p>This document requires no interaction with the ®ISTRAR;.</p>
|
|
</section1>
|
|
|
|
</xep>
|