Re: XML Schema 1.1 Best Practice: Expressing BusinessRules -
> Michael has challenged us to define the term "business rule". I'll take a go at defining it: > > A business rule is a local constraint. > Doesn't work for me. I might have a local constraint that a particular application can only handle one telephone number for a customer, and to stop this application breaking, documents sent to this application must follow this constraint. That's hardly a business rule, it's a contraint imposed by the limitations of a component of the IT system. But it's still a "local" constraint in your sense of the term. Michael Kay Saxonica
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