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<entry-title>rel="enclosure"</entry-title>
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{{DraftSpecification}}


rel-enclosure is a simple, open, format for indicating files to cache which is  embeddable in (X)HTML, Atom, RSS, and arbitrary XML. relEnclosure is an [[elemental-microformat|elemental microformat]], one of several [[microformats|microformat]] open standards.
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__TOC__
== Draft Specification 2005-06-21 ==
=== Author ===
[http://epeus.blogspot.com Kevin Marks], [http://technorati.com Technorati, Inc.]


=== Copyright ===
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{{MicroFormatCopyrightStatement2004}}


=== Patents ===
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{{MicroFormatPatentStatement}}


== Abstract ==
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relEnclosure is one of several microformats.  By adding <code>rel="enclosure"</code> to a hyperlink, a page indicates that the destination of that hyperlink is intended to be downloaded and cached. E.g. with the following hyperlink:
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<pre><nowiki>
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<a href="http://homepage.mac.com/kevinmarks/wwdc2005.mov" rel="enclosure">WWDC 2005 Keynote with chapters</a>
</nowiki></pre>


the author indicates that the movie should be downloaded.
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== Multiple Enclosures ==
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Multiple such rel="enclosure" hyperlinks indicate that several media items should be downloaded.


'''Question:''' What if there are several alternative formats, such as high- and low-bandwidth recordings? Since <link rel="alternate" href="..."> is already defined in XHTML for that purpose, so how should it interact with this new rel tag?
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'''Response:''' rel="alternate" is defined in the HTML spec:
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<blockquote>Designates substitute versions for the document in which the link occurs.</blockquote>
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In the case of enclosure links "alternate" is not suited, because the media file is not a substitute version of the document in which the link occurs - it is a substitute version of another link on the document in which the link occurs.
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'''Proposal:''' Multiple instances of the same enclosure (i.e. same video with different formats, size/resolution, bitrates, etc) could be grouped in a class="enclosure" block with multiple rel="enclosure" links. This would be analogous to <media:group> in [http://search.yahoo.com/mrss MRSS]
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===reply===
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*"In the case of enclosure links "alternate" is not suited, because the media file is not a substitute version of the document in which the link occurs "
**That's not necessarily the case; the linked file may be an audio reading of the text on the page, for instance. [[User:AndyMabbett|Andy Mabbett]] 02:37, 5 Oct 2007 (PDT)


== XMDP profile ==
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<pre><nowiki>
<dl class="profile">
<dt id="rel">rel</dt>
<dd><p>
  <a rel="help" href="http://www.w3.org/TR/html401/struct/links.html#adef-rel">
    HTML4 definition of the 'rel' attribute.</a> 
  Here is an additional value.</p>
  <dl>
  <dt id="enclosure"> enclosure </dt>
  <dd>Indicates that the referred resource is intended to be downloaded and cached</dd>
  </dl>
</dd>
</dl>
</nowiki></pre>


==Examples in the Wild==
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This section is '''informative'''.


The following sites have implemented rel-enclosure, and thus are a great place to start for anyone looking for examples "in the wild" to try parsing, indexing, organizing etc. If your site is marked up with rel-enclosure, feel free to add it to the '''top''' of this list. Once the list grows too big, we'll make a separate wiki page.
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* [http://huffduffer.com/ Huffduffer] uses rel-enclosure on links to audio files marked "download".


== Implementations ==
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This section is '''informative'''.


The following implementations have been developed which either generate or parse rel-enclosure links. If you have a rel-enclosure implementation, feel free to add it to the top of this list. Once the list grows too big, we'll make a separate wiki page.
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* [http://www.feedburner.com FeedBurner]: the [http://forums.feedburner.com/viewtopic.php?t=20 SmartCast] service looks for the rel="enclosure" microformat and converts it to an enclosure in the feed.
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* [http://odeo.com ODEO] [http://odeo.com/blog/2005/07/adding-microformats-to-odeo.html publishes] rel-enclosure links for user podcast MP3s.
* [http://joshkinberg.com/popupmaker/ Video Pop-Up Link Maker]: generates code for rel-enclosure links for videobloggers. Also generates Javascript to launch a pop-up window with the video embedded. (Also available at [http://embedthevideo.com/ embedthevideo.com])


== References ==
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=== Normative References ===
* [http://gmpg.org/xmdp/ XMDP]


=== Informative References ===
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* [http://www.ietf.org/rfc/rfc4287.txt The Atom Syndication Format]:
** 4.2.7.2  The "rel" Attribute
  4.  The value "enclosure" signifies that the IRI in the value of the
      href attribute identifies a related resource which is potentially
      large in size and might require special handling.  For atom:link
      elements with rel="enclosure", the length attribute SHOULD be
      provided.


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==See also==
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* [[rel-enclosure-brainstorming]]
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{{rel-related-pages}}


[[Category:Draft Specifications]]
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[[Category:rel-enclosure]]
 
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Revision as of 04:13, 22 September 2013

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