On Fri, 2016-05-06 at 12:47 +1000, Rick Jelliffe wrote:
>
[...]
> Also on Eliots point that dtds etc have limitations in their power:
All formal systems, of course, are limited, whether by the Arch of
Compassion or by the mathematical inevitability of completeness :-)
> one
> limitation is how to capture (without resorting to ad hoc comments)
> some constraints that are beyond the expressive power of the grammar
> or are contingent in some way. I believe Schematron is still the
> only system to take this seriously.
To some extent XSD does too, by allowing embedded Schematron rules :-)
or other extension mechanisms. DTDs do too, using processing
instructions, although it's terribly underspecified.
Best,
Liam
--
Liam R. E. Quin <>
The World Wide Web Consortium (W3C)
