[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: A single, all-encompassing data validation language -good
> I do not find it difficult to imagine a grammar that can > specify these constraints; using the set-notation formalisms > common in discussions of automata, it's relatively > straightforward (handling the various gregorian exceptions > gets increasingly difficult and verbose as one grows more and > more precise, but it is not inherently beyond the scope of a > grammar ... is it?). I've no idea what the theoretical limits of what you can do with a grammar are (I don't even know what the accepted definition of "grammar" is), but I think I have a feel for the practical limits of when grammar ceases to be the most convenient way of stating the rules. I see people sometimes doing things with regular expressions that in my view are well beyond that limit. Why stretch one technology to its limits when you've crossed into a domain where other technologies do it better? Michael Kay
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