mirror of https://github.com/moparisthebest/xeps
105 lines
4.8 KiB
XML
105 lines
4.8 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>Data Forms Media Element</title>
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<abstract>This document specifies an XMPP protocol extension for including media data in XEP-0004 data forms.</abstract>
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&LEGALNOTICE;
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<number>0221</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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<dependencies>
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<spec>XMPP Core</spec>
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<spec>XEP-0004</spec>
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</dependencies>
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<supersedes>None</supersedes>
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<supersededby>None</supersededby>
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<shortname>TO BE ASSIGNED</shortname>
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&ianpaterson;
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&stpeter;
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<revision>
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<version>0.1</version>
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<date>2007-07-11</date>
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<initials>psa/ip</initials>
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<remark>Initial version, split off from XEP-0158.</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>In certain protocols that make use of &xep0004;, it can be helpful to include media data such as small images. One example of such a "using protocol" is &xep0158;. This document defines a method for including media data in a data form.</p>
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</section1>
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<section1 topic='Media Element' anchor='media'>
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<p>The root element for media data is <media/>. This element MUST be qualified by the "http://www.xmpp.org/extensions/xep-0221.html#ns' namespace &NSNOTE;. The <media/> element MUST be contained within a <field/> element qualified by the 'jabber:x:data' namespace.</p>
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<p>If the media is an image or video then the <media/> element SHOULD include 'height' and 'width' attributes specifying the recommended display size of the media in pixels.</p>
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<p>The <media/> element SHOULD contain at least one <uri/> element to specify the out-of-band location of the media data. <note>Constrained execution environments prevent some clients from rendering media unless it has been received out-of-band (e.g., Web clients).</note> The <uri/> element MUST contain a URI that indicates the location.</p>
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<p>The <media/> element MAY also contain one or more <data/> elements for distributing the media in-band. The <data/> element MUST contain the media data encoded according to Base64 as specified in Section 4 of &rfc4648;. The <em>encoded</em> data SHOULD NOT be larger than 8 kilobytes. <note>If a stanza contains more than one <data/> element, the sending entity MUST take care not to trigger server-defined bandwidth limits.</note></p>
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<p>Each <uri/> or <data/> element MUST include a 'type' atribute that specifies the MIME type (see &rfc2045;) of the media.</p>
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<example caption='Audio Media Element'><![CDATA[
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<media xmlns='http://www.xmpp.org/extensions/xep-0221.html#ns'>
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<uri type='audio/x-wav'>http://victim.example.com/challenges/speech.wav?F3A6292C</uri>
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<uri type='audio/ogg-speex'>http://victim.example.com/challenges/speech.ogg?F3A6292C</uri>
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<uri type='audio/mpeg'>http://victim.example.com/challenges/speech.mp3?F3A6292C</uri>
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<data type='audio/x-wav'> ** Base64 encoded audio ** </data>
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</media>
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]]></example>
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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-0221.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-0221.html#ns'
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xmlns='http://www.xmpp.org/extensions/xep-0221.html#ns'
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elementFormDefault='qualified'>
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<xs:element name='media'>
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<xs:complexType>
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<xs:sequence>
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<xs:element ref='uri' minOccurs='1' maxOccurs='unbounded'/>
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<xs:element ref='data' minOccurs='0' maxOccurs='unbounded'/>
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</xs:sequence>
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<xs:attribute name='height' type='xs:unsignedShort' use='optional'/>
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<xs:attribute name='width' type='xs:unsignedShort' use='optional'/>
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</xs:complexType>
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</xs:element>
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<xs:element name='uri'>
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<xs:complexType>
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<xs:simpleContent>
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<xs:extension base='xs:string'>
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<xs:attribute name='type' use='required'/>
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</xs:extension>
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</xs:simpleContent>
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</xs:complexType>
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</xs:element>
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<xs:element name='data'>
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<xs:complexType>
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<xs:simpleContent>
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<xs:extension base='xs:string'>
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<xs:attribute name='type' use='required'/>
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</xs:extension>
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</xs:simpleContent>
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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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