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xeps/xep-0221.xml
Peter Saint-Andre a59f2263bb using protocol
git-svn-id: file:///home/ksmith/gitmigration/svn/xmpp/trunk@1262 4b5297f7-1745-476d-ba37-a9c6900126ab
2007-09-28 20:55:36 +00:00

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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>Data Forms Media Element</title>
<abstract>This document specifies an XMPP protocol extension for including media data in XEP-0004 data forms.</abstract>
&LEGALNOTICE;
<number>0221</number>
<status>Experimental</status>
<type>Standards Track</type>
<sig>Standards</sig>
<dependencies>
<spec>XMPP Core</spec>
<spec>XEP-0004</spec>
</dependencies>
<supersedes>None</supersedes>
<supersededby>None</supersededby>
<shortname>TO BE ASSIGNED</shortname>
&ianpaterson;
&stpeter;
<revision>
<version>0.1</version>
<date>2007-07-11</date>
<initials>psa/ip</initials>
<remark>Initial version, split off from XEP-0158.</remark>
</revision>
</header>
<section1 topic='Introduction' anchor='intro'>
<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>
</section1>
<section1 topic='Media Element' anchor='media'>
<p>The root element for media data is &lt;media/&gt;. This element MUST be qualified by the "http://www.xmpp.org/extensions/xep-0221.html#ns' namespace &NSNOTE;. The &lt;media/&gt; element MUST be contained within a &lt;field/&gt; element qualified by the 'jabber:x:data' namespace.</p>
<p>If the media is an image or video then the &lt;media/&gt; element SHOULD include 'height' and 'width' attributes specifying the recommended display size of the media in pixels.</p>
<p>The &lt;media/&gt; element SHOULD contain at least one &lt;uri/&gt; 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 &lt;uri/&gt; element MUST contain a URI that indicates the location.</p>
<p>The &lt;media/&gt; element MAY also contain one or more &lt;data/&gt; elements for distributing the media in-band. The &lt;data/&gt; 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 &lt;data/&gt; element, the sending entity MUST take care not to trigger server-defined bandwidth limits.</note></p>
<p>Each &lt;uri/&gt; or &lt;data/&gt; element MUST include a 'type' atribute that specifies the MIME type (see &rfc2045;) of the media.</p>
<example caption='Audio Media Element'><![CDATA[
<media xmlns='http://www.xmpp.org/extensions/xep-0221.html#ns'>
<uri type='audio/x-wav'>http://victim.example.com/challenges/speech.wav?F3A6292C</uri>
<uri type='audio/ogg-speex'>http://victim.example.com/challenges/speech.ogg?F3A6292C</uri>
<uri type='audio/mpeg'>http://victim.example.com/challenges/speech.mp3?F3A6292C</uri>
<data type='audio/x-wav'> ** Base64 encoded audio ** </data>
</media>
]]></example>
</section1>
<section1 topic='XMPP Registrar Considerations' anchor='registrar'>
<section2 topic='Protocol Namespaces' anchor='ns'>
<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 &REGISTRAR; shall issue a permanent namespace in accordance with the process defined in Section 4 of &xep0053;.</p>
</section2>
</section1>
<section1 topic='XML Schema' anchor='schema'>
<code><![CDATA[
<?xml version='1.0' encoding='UTF-8'?>
<xs:schema
xmlns:xs='http://www.w3.org/2001/XMLSchema'
targetNamespace='http://www.xmpp.org/extensions/xep-0221.html#ns'
xmlns='http://www.xmpp.org/extensions/xep-0221.html#ns'
elementFormDefault='qualified'>
<xs:element name='media'>
<xs:complexType>
<xs:sequence>
<xs:element ref='uri' minOccurs='1' maxOccurs='unbounded'/>
<xs:element ref='data' minOccurs='0' maxOccurs='unbounded'/>
</xs:sequence>
<xs:attribute name='height' type='xs:unsignedShort' use='optional'/>
<xs:attribute name='width' type='xs:unsignedShort' use='optional'/>
</xs:complexType>
</xs:element>
<xs:element name='uri'>
<xs:complexType>
<xs:simpleContent>
<xs:extension base='xs:string'>
<xs:attribute name='type' use='required'/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>
<xs:element name='data'>
<xs:complexType>
<xs:simpleContent>
<xs:extension base='xs:string'>
<xs:attribute name='type' use='required'/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>
</xs:schema>
]]></code>
</section1>
</xep>