On Wed, 21 Nov 2001, Patrick M Doane wrote:

> Having abbreviations like 'inline' works really well. I'm curious to know
> if there is a good way to represent the following information:
>
>    <!ELEMENT FORM - - (%flow;)+ -(FORM)>
>
> This states that a FORM element can have any flow object except for FORM
> (i.e. nesting is not allowed).
>
> How difficult would it be to extend the polymorphic variant syntax to list
> tags that should not be included in the conjuction? Perhaps this already
> possible? Of course we can always revert to simply listing the variants.

The type [> `Form of t] where t is an abstract type, for instance
should be ok for this, no ?


-- 
  Alain

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