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.. _reference.version:
:py:attr:`version`
==================
The format and version of the feed.
Here is the complete list of known feed types and versions that may be returned in :py:attr:`version`:
============ ====================================================================================
``atom`` Atom (unknown or unrecognized version)
``atom01`` `Atom 0.1 <http://www.intertwingly.net/blog/1506.html>`_
``atom02`` `Atom 0.2 <http://diveintomark.org/public/2003/08/atom02spec.txt>`_
``atom03`` `Atom 0.3 <http://www.mnot.net/drafts/draft-nottingham-atom-format-02.html>`_
``atom10`` `Atom 1.0 <http://www.ietf.org/rfc/rfc4287>`_
``cdf`` `CDF <http://www.w3.org/TR/NOTE-CDFsubmit.html>`_
``rss`` :abbr:`RSS (Rich Site Summary)` (unknown or unrecognized version)
``rss090`` `RSS 0.90 <http://www.purplepages.ie/RSS/netscape/rss0.90.html>`_
``rss091n`` `Netscape RSS 0.91 <http://my.netscape.com/publish/formats/rss-spec-0.91.html>`_
``rss091u`` `Userland RSS 0.91 <http://backend.userland.com/rss091>`_
``rss092`` `RSS 0.92 <http://backend.userland.com/rss092>`_
``rss093`` `RSS 0.93 <http://backend.userland.com/rss093>`_
``rss094`` :abbr:`RSS (Rich Site Summary)` 0.94 (no accurate specification is known to exist)
``rss10`` `RSS 1.0 <http://purl.org/rss/1.0/>`_
``rss20`` `RSS 2.0 <http://blogs.law.harvard.edu/tech/rss>`_
============ ====================================================================================
If the feed type is completely unknown, :py:attr:`version` will be an empty string.
.. tip::
This element always exists, although it may be an empty string if the version
can not be determined.
.. seealso::
`The Myth of RSS compatibility <http://web.archive.org/web/20110726002019/http://diveintomark.org/archives/2004/02/04/incompatible-rss>`_
Mark Pilgrim's excellent analysis of the extraordinary variety of
incompatibilities each version of "RSS" introduced.
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