mirror of
https://github.com/moparisthebest/xeps
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147 lines
6.7 KiB
XML
147 lines
6.7 KiB
XML
<?xml version='1.0' encoding='UTF-8'?>
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<!DOCTYPE xep SYSTEM 'xep.dtd' [
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<!ENTITY % ents SYSTEM 'xep.ent'>
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%ents;
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]>
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<?xml-stylesheet type='text/xsl' href='xep.xsl'?>
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<xep>
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<header>
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<title>Service Discovery Notifications</title>
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<abstract>This specification defines a method for requesting and receiving notifications regarding XMPP service discovery items.</abstract>
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&LEGALNOTICE;
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<number>0230</number>
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<status>Deferred</status>
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<type>Standards Track</type>
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<sig>Standards</sig>
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<approver>Council</approver>
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<dependencies>
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<spec>XMPP Core</spec>
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<spec>XEP-0030</spec>
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<spec>XEP-0060</spec>
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</dependencies>
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<supersedes/>
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<supersededby/>
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<shortname>NOT YET ASSIGNED</shortname>
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&hildjj;
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&stpeter;
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<revision>
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<version>0.1.1</version>
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<date>2016-10-04</date>
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<initials>egp</initials>
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<remark><p>Add forgotten namespace in example 3, and change the text to describe the correct element.</p></remark>
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</revision>
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<revision>
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<version>0.1</version>
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<date>2008-01-30</date>
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<initials>psa</initials>
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<remark><p>Initial published version.</p></remark>
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</revision>
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<revision>
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<version>0.0.2</version>
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<date>2008-01-06</date>
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<initials>jjh/psa</initials>
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<remark><p>Corrected example to use full JIDs and SubIDs.</p></remark>
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</revision>
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<revision>
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<version>0.0.1</version>
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<date>2008-01-03</date>
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<initials>jjh/psa</initials>
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<remark><p>First draft.</p></remark>
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</revision>
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</header>
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<section1 topic='Introduction' anchor='intro'>
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<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>
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</section1>
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<section1 topic='Protocol' anchor='protocol'>
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<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>
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<example caption='Requesting entity sends presence'><![CDATA[
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<presence from='bill@shakespeare.lit/globe' to='chat.shakespeare.lit'/>
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]]></example>
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<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>
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<example caption='Requesting all items'><![CDATA[
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<iq type='get'
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from='bill@shakespeare.lit/globe'
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to='chat.shakespeare.lit'
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id='items1'>
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<query xmlns='http://jabber.org/protocol/disco#items'>
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<subscribe xmlns='http://jabber.org/protocol/pubsub'/>
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</query>
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</iq>
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]]></example>
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<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>
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<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>
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<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>
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<example caption='Result-set for all items'><![CDATA[
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<iq type='result'
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from='chat.shakespeare.lit'
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to='bill@shakespeare.lit/globe'
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id='items1'>
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<query xmlns='http://jabber.org/protocol/disco#items'>
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<item jid='alls-well-that-ends-well@chat.shakespeare.lit'/>
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<item jid='as-you-like-it@chat.shakespeare.lit'/>
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<item jid='cleopatra@chat.shakespeare.lit'/>
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<item jid='comedy-of-errors@chat.shakespeare.lit'/>
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<item jid='coriolanus@chat.shakespeare.lit'/>
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<item jid='cymbeline@chat.shakespeare.lit'/>
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<item jid='hamlet@chat.shakespeare.lit'/>
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<item jid='henry-the-fourth-one@chat.shakespeare.lit'/>
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<item jid='henry-the-fourth-two@chat.shakespeare.lit'/>
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<item jid='henry-the-fifth@chat.shakespeare.lit'/>
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<subscription
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xmlns='http://jabber.org/protocol/pubsub'
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jid='bill@shakespeare.lit'
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subid='some-long-sub-id'
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subscription='subscribed'/>
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</query>
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</iq>
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]]></example>
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<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>
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<example caption='A notification (new item)'><![CDATA[
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<message from='chat.shakespeare.lit' to='bill@shakespeare.lit' id='foo'>
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<event xmlns='http://jabber.org/protocol/pubsub#event'>
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<items node='http://jabber.org/protocol/disco#items'>
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<item id='ae890ac52d0df67ed7cfdf51b644e901'>
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<item xmlns='http://jabber.org/protocol/disco#items'
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jid='henry-the-fifth@chat.shakespeare.lit'/>
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</item>
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</items>
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</event>
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</message>
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]]></example>
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<example caption='A notification (deleted item)'><![CDATA[
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<message from='chat.shakespeare.lit' to='bill@shakespeare.lit' id='bar'>
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<event xmlns='http://jabber.org/protocol/pubsub#event'>
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<items node='http://jabber.org/protocol/disco#items'/>
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<retract id='fa890ca52d0df67de7fcfd51b644c701'>
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<item xmlns='http://jabber.org/protocol/disco#items'
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jid='cardenio@chat.shakespeare.lit'/>
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</retract>
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</items>
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</event>
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</message>
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]]></example>
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<p>When the requesting entity goes offline, the responding entity will receive unavailable presence.</p>
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<example caption='Responding entity receives unavailable presence'><![CDATA[
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<presence from='bill@shakespeare.lit/globe'
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to='chat.shakespeare.lit'
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type='unavailable'/>
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]]></example>
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<p>The responding entity then MUST NOT send further notifications.</p>
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</section1>
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<section1 topic='Security Considerations' anchor='security'>
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<p>This document introduces no new security considerations above and beyond those already defined for service discovery and publish-subscribe.</p>
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</section1>
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<section1 topic='IANA Considerations' anchor='iana'>
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<p>This document requires no interaction with &IANA;.</p>
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</section1>
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<section1 topic='XMPP Registrar Considerations' anchor='registrar'>
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<p>This document requires no interaction with the ®ISTRAR;.</p>
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</section1>
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</xep>
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