mirror of https://github.com/moparisthebest/xeps
315 lines
11 KiB
XML
315 lines
11 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>User Tune</title>
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<abstract>This document defines an XMPP protocol extension for communicating information about the music to which a user is listening.</abstract>
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&LEGALNOTICE;
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<number>0118</number>
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<status>Draft</status>
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<type>Standards Track</type>
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<sig>Standards</sig>
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<dependencies>
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<spec>XMPP Core</spec>
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<spec>XMPP IM</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>tune</shortname>
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<schemaloc>
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<url>http://www.xmpp.org/schemas/tune.xsd</url>
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</schemaloc>
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&stpeter;
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<revision>
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<version>1.0</version>
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<date>2004-11-12</date>
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<initials>psa</initials>
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<remark>Per a vote of the Jabber Council, advanced status to Draft.</remark>
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</revision>
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<revision>
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<version>0.10</version>
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<date>2004-10-29</date>
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<initials>psa</initials>
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<remark>Added example with URL.</remark>
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</revision>
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<revision>
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<version>0.9</version>
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<date>2004-10-27</date>
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<initials>psa</initials>
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<remark>Changed recommendation to not include the <length/> element if the track time is unknown.</remark>
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</revision>
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<revision>
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<version>0.8</version>
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<date>2004-10-26</date>
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<initials>psa</initials>
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<remark>Added implementation notes; clarified nature of <source/> and <track/> elements; if length is unknown, set to zero.</remark>
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</revision>
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<revision>
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<version>0.7</version>
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<date>2004-05-20</date>
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<initials>psa</initials>
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<remark>Changed <length/> datatype from xs:duration to xs:unsignedShort.</remark>
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</revision>
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<revision>
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<version>0.6</version>
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<date>2004-04-25</date>
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<initials>psa</initials>
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<remark>Corrected several errors; added reference to XEP-0033.</remark>
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</revision>
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<revision>
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<version>0.5</version>
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<date>2004-02-19</date>
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<initials>psa</initials>
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<remark>Reverted from infobits to tune elements.</remark>
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</revision>
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<revision>
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<version>0.4</version>
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<date>2003-12-14</date>
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<initials>psa</initials>
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<remark>Slight modifications to track changes to infobits specifications.</remark>
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</revision>
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<revision>
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<version>0.3</version>
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<date>2003-10-23</date>
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<initials>psa</initials>
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<remark>Replaced tune elements with infobits.</remark>
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</revision>
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<revision>
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<version>0.2</version>
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<date>2003-09-10</date>
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<initials>psa</initials>
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<remark>Added "stop" function via empty <tune/> element.</remark>
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</revision>
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<revision>
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<version>0.1</version>
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<date>2003-09-08</date>
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<initials>psa</initials>
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<remark>Initial version.</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>This document defines a protocol for communicating information about the music to which a user is listening. Such information may be seen as a kind of "extended presence", and users may want to communicate such information to their contacts on the network as a fun add-on to traditional IM applications or to provide integration with common music-player applications.</p>
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</section1>
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<section1 topic='Protocol' anchor='protocol'>
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<section2 topic='Container Element and Child Elements' anchor='protocol-elements'>
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<p>Information about tunes is provided by the user and propagated on the network by the user's client. The information container for tune data is a <tune/> element that is qualified by the 'http://jabber.org/protocol/tune' namespace. The tune information itself is provided as the XML character data of the following children of the <tune/> element:</p>
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<table caption='Child Elements'>
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<tr>
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<th>Element</th>
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<th>Description</th>
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<th>Example</th>
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<th>Datatype</th>
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</tr>
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<tr>
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<td>artist</td>
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<td>The artist or performer of the song or piece</td>
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<td>Yes</td>
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<td>xs:string</td>
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</tr>
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<tr>
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<td>title</td>
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<td>The title of the song or piece</td>
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<td>Heart of the Sunrise</td>
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<td>xs:string</td>
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</tr>
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<tr>
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<td>source</td>
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<td>The collection (e.g., album) or other source (e.g., a band website that hosts streams or audio files)</td>
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<td>Yessongs</td>
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<td>xs:string</td>
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</tr>
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<tr>
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<td>track</td>
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<td>A unique identifier for the tune; e.g., the track number within a collection or the specific URI for the object (e.g., a stream or audio file)</td>
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<td>3</td>
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<td>xs:string</td>
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</tr>
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<tr>
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<td>length</td>
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<td>The duration of the song or piece in seconds</td>
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<td>686</td>
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<td>xs:unsignedShort</td>
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</tr>
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</table>
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<p>NOTE: The datatypes specified above are defined in &w3xmlschema2;.</p>
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</section2>
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<section2 topic='Transport Mechanism' anchor='protocol-transport'>
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<p>Tune information SHOULD be communicated and transported by means of the &xep0060; protocol. Because tune information is not pure presence information and can change independently of the user's availability, it SHOULD NOT be provided as an extension to &PRESENCE;.</p>
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<example caption='User Publishes Tune Information'><![CDATA[
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<iq type='set'
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from='stpeter@jabber.org/work'
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to='pubsub.jabber.org'
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id='tunes123'>
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<pubsub xmlns='http://jabber.org/protocol/pubsub'>
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<publish node='generic/tunes/stpeter@jabber.org'>
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<item id='current'>
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<tune xmlns='http://jabber.org/protocol/tune'>
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<artist>Yes</artist>
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<title>Heart of the Sunrise</title>
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<source>Yessongs</source>
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<track>3</track>
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<length>686</length>
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</tune>
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</item>
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</publish>
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</pubsub>
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</iq>
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]]></example>
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<p>The tune information is then delivered to all subscribers:</p>
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<example caption='Tune Information is Delivered to All Subscribers'><![CDATA[
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<message
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from='pubsub.jabber.org'
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to='maineboy@jabber.org'>
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<event xmlns='http://jabber.org/protocol/pubsub#event'>
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<items node='generic/tunes/stpeter@jabber.org'>
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<item id='current'>
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<tune xmlns='http://jabber.org/protocol/tune'>
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<artist>Yes</artist>
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<title>Heart of the Sunrise</title>
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<source>Yessongs</source>
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<track>3</track>
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<length>686</length>
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</tune>
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</item>
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</items>
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</event>
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</message>
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.
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.
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.
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]]></example>
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<p>As mentioned in XEP-0060, the stanza containing the event notification or payload MAY also include 'replyto' data (as specified by the &xep0033; protocol) to provide an explicit association between the published data and the user:</p>
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<example caption="Event notification with extended stanza addressing"><![CDATA[
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<message
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from='pubsub.jabber.org'
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to='maineboy@jabber.org'>
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<event xmlns='http://jabber.org/protocol/pubsub#event'>
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<items node='generic/tunes/stpeter@jabber.org'>
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<item id='current'>
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<tune xmlns='http://jabber.org/protocol/tune'>
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<artist>Yes</artist>
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<title>Heart of the Sunrise</title>
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<source>Yessongs</source>
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<track>3</track>
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<length>686</length>
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</tune>
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</item>
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</items>
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</event>
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<addresses xmlns='http://jabber.org/protocol/address'>
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<address type='replyto' jid='juliet@capulet.com'/>
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</addresses>
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</message>
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]]></example>
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<p>Naturally, further extensions could be included, e.g., using &xep0066; to specify a URL where one could buy the recording.</p>
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<example caption="Tune info with URL"><![CDATA[
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<message
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from='pubsub.jabber.org'
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to='maineboy@jabber.org'>
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<event xmlns='http://jabber.org/protocol/pubsub#event'>
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<items node='generic/tunes/stpeter@jabber.org'>
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<item id='current'>
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<tune xmlns='http://jabber.org/protocol/tune'>
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<artist>Yes</artist>
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<title>Heart of the Sunrise</title>
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<source>Yessongs</source>
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<track>3</track>
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<length>686</length>
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<x xmlns='jabber:x:oob'>
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<url>http://www.amazon.com/exec/obidos/ASIN/B000002J1Y</url>
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</x>
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</tune>
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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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</section2>
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<section2 topic='Stop Command' anchor='protocol-stop'>
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<p>In order to indicate that the user is no longer listening to any tunes, the user's client SHOULD send an empty <tune/> element, which can be considered a "stop command" for user tunes:</p>
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<example caption='User Publishes "Stop Playing" Information'><![CDATA[
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<iq type='set'
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from='stpeter@jabber.org/work'
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to='pubsub.jabber.org'
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id='tunes345'>
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<pubsub xmlns='http://jabber.org/protocol/pubsub'>
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<publish node='generic/tunes/stpeter@jabber.org'>
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<item id='current'>
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<tune xmlns='http://jabber.org/protocol/tune'/>
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</item>
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</publish>
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</pubsub>
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</iq>
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]]></example>
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<example caption='Empty Tune Information is Delivered to All Subscribers'><![CDATA[
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<message
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from='pubsub.jabber.org'
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to='maineboy@jabber.org'>
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<event xmlns='http://jabber.org/protocol/pubsub#event'>
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<items node='generic/tunes/stpeter@jabber.org'>
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<item id='current'>
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<tune xmlns='http://jabber.org/protocol/tune'/>
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</item>
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</items>
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</event>
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</message>
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.
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.
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.
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]]></example>
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</section2>
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</section1>
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<section1 topic='Implementation Notes' anchor='impl'>
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<p>To prevent a large number of updates when a user is skipping through tracks, an implementation may wait several seconds before publishing new tune information.</p>
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<p>If the length is unknown (e.g., the user is listening to a stream), the <length/> element SHOULD NOT be included.</p>
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</section1>
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<section1 topic='Security Considerations' anchor='security'>
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<p>This protocol introduces no security considerations above and beyond those defined in <cite>Publish-Subscribe</cite> (XEP-0060).</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='registrar-ns'>
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<p>The ®ISTRAR; includes 'http://jabber.org/protocol/tune' in its registry of protocol namespaces.</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://jabber.org/protocol/tune'
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xmlns='http://jabber.org/protocol/tune'
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elementFormDefault='qualified'>
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<xs:annotation>
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<xs:documentation>
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The protocol documented by this schema is defined in
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XEP-0118: http://www.xmpp.org/extensions/xep-0118.html
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</xs:documentation>
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</xs:annotation>
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<xs:element name='tune'>
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<xs:complexType>
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<xs:sequence minOccurs='0'>
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<xs:element name='artist' type='xs:string' minOccurs='0'/>
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<xs:element name='title' type='xs:string' minOccurs='0'/>
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<xs:element name='source' type='xs:string' minOccurs='0'/>
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<xs:element name='track' type='xs:string' minOccurs='0'/>
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<xs:element name='length' type='xs:unsignedShort' minOccurs='0'/>
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</xs:sequence>
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</xs:complexType>
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</xs:element>
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</xs:schema>
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]]></code>
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</section1>
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</xep>
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