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.. _advanced.bozo:
Bozo Detection
==============
:program:`Universal Feed Parser` can parse feeds whether they are well-formed
:abbr:`XML (Extensible Markup Language)` or not. However, since some
applications may wish to reject or warn users about non-well-formed feeds,
:program:`Universal Feed Parser` sets the ``bozo`` bit when it detects that a
feed is not well-formed. Thanks to `Tim Bray
<http://www.tbray.org/ongoing/When/200x/2004/01/11/PostelPilgrim>`_ for
suggesting this terminology.
Detecting a non-well-formed feed
--------------------------------
::
>>> d = feedparser.parse('http://feedparser.org/docs/examples/atom10.xml')
>>> d.bozo
0
>>> d = feedparser.parse('http://feedparser.org/tests/illformed/rss/aaa_illformed.xml')
>>> d.bozo
1
>>> d.bozo_exception
<xml.sax._exceptions.SAXParseException instance at 0x00BAAA08>
>>> exc = d.bozo_exception
>>> exc.getMessage()
"expected '>'\\n"
>>> exc.getLineNumber()
6
There are many reasons an :abbr:`XML (Extensible Markup Language)` document
could be non-well-formed besides this example (incomplete end tags) See
:ref:`advanced.encoding` for some other ways to trip the bozo bit.
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