mirror of
https://github.com/moparisthebest/xeps
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659b8b11a0
git-svn-id: file:///home/ksmith/gitmigration/svn/xmpp/trunk@1124 4b5297f7-1745-476d-ba37-a9c6900126ab
155 lines
7.7 KiB
XML
155 lines
7.7 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>Attention</title>
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<abstract>This document defines an XMPP protocol extension for getting the attention of another user.</abstract>
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&LEGALNOTICE;
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<number>0224</number>
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<status>Experimental</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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</dependencies>
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<supersedes/>
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<supersededby/>
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<shortname>NOT YET ASSIGNED</shortname>
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<author>
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<firstname>Andreas</firstname>
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<surname>Monitzer</surname>
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<email>andy@monitzer.com</email>
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<jid>andy@monitzer.com</jid>
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</author>
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<revision>
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<version>0.1</version>
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<date>2007-08-08</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>0.0.1</version>
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<date>2007-07-03</date>
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<initials>am</initials>
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<remark><p>Initial version.</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>Even though a client might be available (as stated in the most recent presence stanza) the user this client belongs to might not have the focus on the client currently. &xep0132; defines a method for a physical test of user presence. Since this requires special hardware that can not be assumed to be available, this XEP defines a software-only implementation where no direct feedback is expected. This is known as 'nudge' or 'buzz' in some legacy IM protocols.</p>
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<p>It was discussed whether this should be part of &xep0085;. However, the semantics are inherently different, since it describes the sender's state, not a request to change the receiver's. Thus, a separate extension is desirable.</p>
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</section1>
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<section1 topic='Requirements' anchor='reqs'>
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<p>The specification addresses remotely getting the user's attention in a more assertive way than simple text messages.</p>
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</section1>
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<section1 topic='Protocol' anchor='protocol'>
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<p>In the following conversation, a user talks to somebody, but this user doesn't respond. The second inquiry includes an attention extension.</p>
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<example caption="User sends a regular message"><![CDATA[
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<message from='calvin@usrobots.lit/lab' to='herbie@usrobots.lit/home' type='chat'>
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<body>All right, then, Herbie, give! We're waiting.</body>
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</message>
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]]></example>
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<p>When no reply is received, the sending user might want to grab the other's attention. This is done by sending a message that includes an <attention/> element qualified by the 'http://www.xmpp.org/extensions/xep-0224.html#ns' namespace &NSNOTE;. Note: The message may or may not include a &BODY; element.</p>
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<example caption="User tries to capture the other's attention"><![CDATA[
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<message from='calvin@usrobots.lit/lab' to='herbie@usrobots.lit/home' type='headline'>
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<attention xmlns='http://www.xmpp.org/extensions/xep-0224.html#ns'/>
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<body>Why don't you answer, Herbie?</body>
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</message>
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]]></example>
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<p>Finally, the receiving user notices the urgency of the message and responds.</p>
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<example caption="The user whose attention has been captured responds."><![CDATA[
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<message from='herbie@usrobots.lit/home' to='calvin@usrobots.lit/lab' type='chat'>
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<body>I cannot. You know I cannot! Dr. Bogert and Dr. Lanning don't want me to.</body>
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</message>
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]]></example>
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</section1>
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<section1 topic='Business Rules' anchor='rules'>
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<p>The following rules apply to generating and processing of the attention extension.
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<ol>
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<li>Before sending an attention message stanza, the client MUST confirm support for it in the other client as described under <link url='#disco'>Determining Support</link>.</li>
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<li>The message stanza containing the attention extension MAY contain a body and/or other extensions, which is to be displayed along with executing the attention event.</li>
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<li>In message stanzas containing either &xep0203; data, attention extensions MUST be ignored, since this is an instant event which should not be replayed after a delay.</li>
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<li>Messages containing an attention extension SHOULD use the headline message type to avoid offline storage.</li>
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<li>Using the attention extension in &IQ; stanzas is not desirable, since this is part of the conversation.</li>
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</ol>
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</p>
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</section1>
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<section1 topic='Determining Support' anchor='disco'>
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<p>If an entity supports receiving the attention extension, it MUST advertise that fact in its responses to &xep0030; information ("disco#info") requests by returning a feature of "http://www.xmpp.org/extensions/xep-0224.html#ns":</p>
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<example caption='A disco#info query'><![CDATA[
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<iq type='get'
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from='calvin@usrobots.lit/lab'
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to='herbie@usrobots.lit/home'
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id='disco1'>
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<query xmlns='http://jabber.org/protocol/disco#info'/>
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</iq>
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]]></example>
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<example caption='A disco#info response'><![CDATA[
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<iq type='result'
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from='herbie@usrobots.lit/home'
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to='calvin@usrobots.lit/lab'
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id='disco1'>
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<query xmlns='http://jabber.org/protocol/disco#info'>
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...
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<feature var='http://www.xmpp.org/extensions/xep-0224.html#ns'/>
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...
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</query>
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</iq>
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]]></example>
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<p>In addition, support for receiving attention extensions in message stanzas can be determined through the dynamic profile of Service Discovery defined in &xep0115;.</p>
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</section1>
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<section1 topic='Implementation Notes' anchor='impl'>
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<p>The implementation of the alert is up to the developer. Possible behavior is:</p>
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<ul>
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<li>Shaking the window.</li>
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<li>Playing a specific sound not used for any other event.</li>
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<li>Flashing the screen.</li>
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<li>Enabling external hardware such as flashlights.</li>
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<li>Let it be user customizable.</li>
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</ul>
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<p>However, since some users might not want this feature to disturb them, a client SHOULD enable the user to disable support. When the feature is disabled, it MUST NOT be advertised in disco#info.</p>
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<p>Rate-limiting might be desirable in some implementations.</p>
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<p>Formal feedback in response to the attention request to the requesting user is not specified, and so the request might be silently dropped.</p>
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</section1>
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<section1 topic='Security Considerations' anchor='security'>
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<p>It is recommended that only message stanzas containing attention extensions from peers on the user's roster are accepted. Finer grained control might be implemented.</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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<section2 topic='Protocol Namespaces' anchor='ns'>
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<p>Until this specification advances to a status of Draft, its associated namespace shall be "http://www.xmpp.org/extensions/xep-0224.html#ns"; upon advancement of this specification, the ®ISTRAR; shall issue a permanent namespace in accordance with the process defined in Section 4 of &xep0053;.</p>
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</section2>
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</section1>
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<section1 topic='XML Schema' anchor='schema'>
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<code><![CDATA[
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<?xml version='1.0' encoding='UTF-8'?>
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<xs:schema
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xmlns:xs='http://www.w3.org/2001/XMLSchema'
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targetNamespace='http://www.xmpp.org/extensions/xep-0224.html#ns'
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xmlns='http://www.xmpp.org/extensions/xep-0224.html#ns'
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elementFormDefault='qualified'>
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<xs:element name='attention' type='empty'/>
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<xs:simpleType name='empty'>
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<xs:restriction base='xs:string'>
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<xs:enumeration value=''/>
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</xs:restriction>
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</xs:simpleType>
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</xs:schema>
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]]></code>
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</section1>
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<section1 topic='Acknowledgements' anchor='ack'>
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<p>The quotes have been taken from Isaac Asimov's short story "Liar!" as published in the book <cite>The Complete Robot</cite>.</p>
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</section1>
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</xep>
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