• From: Michael Kay <mike@s...>
• To: xml-dev@l...
• Date: Fri, 12 Nov 2010 00:13:59 +0000

> 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

• References:
  • XML Schema 1.1 Best Practice: Expressing Business Rules -Co-Locate or Separate?
    • From: "Costello, Roger L." <costello@m...>
  • Re: XML Schema 1.1 Best Practice: Expressing BusinessRules - Co-Locate or Separate?
    • From: Michael Kay <mike@s...>
  • RE: XML Schema 1.1 Best Practice: Expressing BusinessRules - Co-Locate or Separate?
    • From: "Costello, Roger L." <costello@m...>