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From: "David LeBlanc" <email@example.com>
> A question has arisen about element content. I'm reasonably sure I've read
> that it's illegal for an element to contain itself either directly or
> indirectly. Is this correct, and if so, can someone point me to the relevant
> section of the XML Recommendation please?
No such constraint exists in XML.
SGML provided a facility, the exclusion exception, to all this constraint to be specified.
You can also sepcify it trivially in Schematron.
Topologi's "Editor's Concrete Syntax" uses the SGML '97 facility of "amply-tagged", which
does have the restriction that an element cannot directly contain itself, which allows
an implication policy for ommitted end-tags, see