Kees Bos added the comment:
I'm not an expert, but from: http://www.w3.org/TR/REC-xml/#NT-AttValue
AttValue ::= '"' ([^<&"] | Reference)* '"' | "'" ([^<&'] | Reference)*
"'"
which I read as: Any Reference character is valid, except & and <, which are
used for escaping and closing the element.
The sequence <value>]]></value> also valdates as well-formed at
http://www.xmlvalidation.com/
The sequence <value>]></value> parses OK (So, it's only with a double ] and > )
It's probably related to parsing <![CDATA[ ... ]]> (i.e. I guess when the
parser detects ]]> it
assumes / requires the state of <![CDATA[ which is, of course, not true)
The sequence <value><![CDATA[foo]]></value> is parsed correctly:
>>> ET.fromstring('<value><![CDATA[foo]]></value>').text
'foo'
BTW, lxml.etree.fromstring fails also and so does
http://www.w3schools.com/xml/xml_validator.asp
I'll ask around on the lxml mailinglist what they think about this behavior.
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