RE: A single, all-encompassing data validation language -good
> > > 2. Is grammar validation of a fundamentally different > nature than rule validation? > > I think so. Say you've got a schema that says an element representing data for a month must have at most 31 children, and you decide you want to be a bit more precise and say it must be 30 for some months and 31 for others and occasionally 28 or 29. Does this refinement mean you are doing something of a fundamentally different nature? I think not. It does mean that you've crossed the limits of what can be done with a grammar-based approach, but surely we should make it as easy and seamless for people to cross that boundary as we can? Michael Kay http://www.saxonica.com/
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