Re: [Caml-list] New polymorphic variant syntax

[Patrick M Doane <patrick@watson.org>]

On Wed, 21 Nov 2001, Alain Frisch wrote:

> 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 ?

I was thinking about that but isn't it rather confusing? It certainly
disables the use of `Form, but it would be clearer if there was no mention
of it at all.

Patrick

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