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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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