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Feed Type and Version Detection
===============================
:program:`Universal Feed Parser` attempts to autodetect the type and version of
the feeds it parses. There are many subtle and not-so-subtle differences
between the different versions of :abbr:`RSS (Rich Site Summary)`, and
applications may choose to handle different feed types in different ways.
Accessing feed version
----------------------
::
>>> d = feedparser.parse('http://feedparser.org/docs/examples/atom10.xml')
>>> d.version
'atom10'
>>> d = feedparser.parse('http://feedparser.org/docs/examples/atom03.xml')
>>> d.version
'atom03'
>>> d = feedparser.parse('http://feedparser.org/docs/examples/rss20.xml')
>>> d.version
'rss20'
>>> d = feedparser.parse('http://feedparser.org/docs/examples/rss20dc.xml')
>>> d.version
'rss20'
>>> d = feedparser.parse('http://feedparser.org/docs/examples/rss10.rdf')
>>> d.version
'rss10'
Here is the complete list of known feed types and versions that may be returned in ``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>`_ (`differences from Netscape RSS 0.91 <https://web.archive.org/web/20110927015220/http://diveintomark.org/archives/2004/02/04/incompatible-rss#example3>`_)
``rss10``
`RSS 1.0 <http://purl.org/rss/1.0/>`_
``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)
``rss20``
`RSS 2.0 <http://blogs.law.harvard.edu/tech/rss>`_
``rss``
:abbr:`RSS (Rich Site Summary)` (unknown or unrecognized version)
``atom01``
`Atom 0.1 <http://www.intertwingly.net/blog/1506.html>`_
``atom02``
`Atom 0.2 <https://web.archive.org/web/20080612041743/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>`_
``atom``
Atom (unknown or unrecognized version)
``cdf``
`CDF <http://www.w3.org/TR/NOTE-CDFsubmit.html>`_
If the feed type is completely unknown, ``version`` will be an empty string.
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