Re: Two messages from James Clark that ought to be read

David Luce wrote:
> 
>...
> 
> We are somewhat new to XSDs, but have found them very
> useful for data typing, setting a field to be
> non-nillable, etc. Unfortunately, we've not found
> mechanism to support heuristic validation rules such
> as a Estimated Time of Arrival must be equal to or
> less than an Estimated Time of Departure.

I'd suggest Schematron. But further discussion should move to xml-dev.

 Paul Prescod