Re: Define a root in a DTD

[John Cowan <jcowan@reutershealth.com>]

Peter Flynn wrote:

> The root element is always the one that
> does not appear in the content model of any other element 
> type. All other elements must get mentioned somewhere else,
> but the root element never does.


This may be true in practice, but it is easy to create DTDs where
it is false, e.g.:

<!ELEMENT group (buy|sell|group)+>
<!ELEMENT buy EMPTY>
<!ELEMENT sell EMPTY>

where "group" is meant to be the root.

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