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<span id="reference-version"></span><h1><tt class="xref py py-attr docutils literal"><span class="pre">version</span></tt><a class="headerlink" href="#version" title="Permalink to this headline">ΒΆ</a></h1>
<p>The format and version of the feed.</p>
<p>Here is the complete list of known feed types and versions that may be returned in <tt class="xref py py-attr docutils literal"><span class="pre">version</span></tt>:</p>
<table border="1" class="docutils">
<colgroup>
<col width="13%" />
<col width="88%" />
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<tbody valign="top">
<tr class="row-odd"><td><tt class="docutils literal"><span class="pre">atom</span></tt></td>
<td>Atom (unknown or unrecognized version)</td>
</tr>
<tr class="row-even"><td><tt class="docutils literal"><span class="pre">atom01</span></tt></td>
<td><a class="reference external" href="http://www.intertwingly.net/blog/1506.html">Atom 0.1</a></td>
</tr>
<tr class="row-odd"><td><tt class="docutils literal"><span class="pre">atom02</span></tt></td>
<td><a class="reference external" href="http://diveintomark.org/public/2003/08/atom02spec.txt">Atom 0.2</a></td>
</tr>
<tr class="row-even"><td><tt class="docutils literal"><span class="pre">atom03</span></tt></td>
<td><a class="reference external" href="http://www.mnot.net/drafts/draft-nottingham-atom-format-02.html">Atom 0.3</a></td>
</tr>
<tr class="row-odd"><td><tt class="docutils literal"><span class="pre">atom10</span></tt></td>
<td><a class="reference external" href="http://www.ietf.org/rfc/rfc4287">Atom 1.0</a></td>
</tr>
<tr class="row-even"><td><tt class="docutils literal"><span class="pre">cdf</span></tt></td>
<td><a class="reference external" href="http://www.w3.org/TR/NOTE-CDFsubmit.html">CDF</a></td>
</tr>
<tr class="row-odd"><td><tt class="docutils literal"><span class="pre">rss</span></tt></td>
<td><abbr title="Rich Site Summary">RSS</abbr> (unknown or unrecognized version)</td>
</tr>
<tr class="row-even"><td><tt class="docutils literal"><span class="pre">rss090</span></tt></td>
<td><a class="reference external" href="http://www.purplepages.ie/RSS/netscape/rss0.90.html">RSS 0.90</a></td>
</tr>
<tr class="row-odd"><td><tt class="docutils literal"><span class="pre">rss091n</span></tt></td>
<td><a class="reference external" href="http://my.netscape.com/publish/formats/rss-spec-0.91.html">Netscape RSS 0.91</a></td>
</tr>
<tr class="row-even"><td><tt class="docutils literal"><span class="pre">rss091u</span></tt></td>
<td><a class="reference external" href="http://backend.userland.com/rss091">Userland RSS 0.91</a></td>
</tr>
<tr class="row-odd"><td><tt class="docutils literal"><span class="pre">rss092</span></tt></td>
<td><a class="reference external" href="http://backend.userland.com/rss092">RSS 0.92</a></td>
</tr>
<tr class="row-even"><td><tt class="docutils literal"><span class="pre">rss093</span></tt></td>
<td><a class="reference external" href="http://backend.userland.com/rss093">RSS 0.93</a></td>
</tr>
<tr class="row-odd"><td><tt class="docutils literal"><span class="pre">rss094</span></tt></td>
<td><abbr title="Rich Site Summary">RSS</abbr> 0.94 (no accurate specification is known to exist)</td>
</tr>
<tr class="row-even"><td><tt class="docutils literal"><span class="pre">rss10</span></tt></td>
<td><a class="reference external" href="http://purl.org/rss/1.0/">RSS 1.0</a></td>
</tr>
<tr class="row-odd"><td><tt class="docutils literal"><span class="pre">rss20</span></tt></td>
<td><a class="reference external" href="http://blogs.law.harvard.edu/tech/rss">RSS 2.0</a></td>
</tr>
</tbody>
</table>
<p>If the feed type is completely unknown, <tt class="xref py py-attr docutils literal"><span class="pre">version</span></tt> will be an empty string.</p>
<div class="admonition tip">
<p class="first admonition-title">Tip</p>
<p class="last">This element always exists, although it may be an empty string if the version
can not be determined.</p>
</div>
<div class="admonition-see-also admonition seealso">
<p class="first admonition-title">See also</p>
<dl class="last docutils">
<dt><a class="reference external" href="http://web.archive.org/web/20110726002019/http://diveintomark.org/archives/2004/02/04/incompatible-rss">The Myth of RSS compatibility</a></dt>
<dd>Mark Pilgrim’s excellent analysis of the extraordinary variety of
incompatibilities each version of “RSS” introduced.</dd>
</dl>
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