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- From: Eric Bohlman <ebohlman@netcom.com>
- To: "Schoedl, Andreas" <Andreas.Schoedl@softwareag.com>
- Date: Wed, 31 May 2000 08:40:31 -0700 (PDT)
On Wed, 31 May 2000, Schoedl, Andreas wrote:
> <!ELEMENT C (A,A)>, is such content model allowed? I ask, because I can
> nowhere find the statement that it is forbidden. But I strongly feel that it
> should be!
Why?
> Whereas <!ELEMENT C (A?,A)> seems to be excluded (XML REC 3.2.1), alas not
> _very_ explicitly.
Because the content model is ambiguous. When the processor sees the first
<A> after a <C>, it can't tell whether it's the first or second item in
the sequence without looking ahead. Note that (A,A?) describes the same
language but is not ambiguous.
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