HTML content in elements such as <description> (RSS
2.0) and <title type="html"> (Atom 1.0 text constructs)
must be escaped, using either CDATA declarations or XML
entities; with the latter, an ampersand must be escaped
twice ("&amp;" – see
http://www.feedvalidator.org/docs/error/MissingXhtmlDiv.html\).
HTML content that's escaped using XML entities but
contains an ampersand that's escaped only once
("&") doesn't validate as HTML, once converted back
to its original (intended) form. Currently, feeds
containing such content validate without raising a
warning, even though their content ultimately won't
validate.
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