• From: Michael Kay <mike@s...>
• To: xml-dev@l...
• Date: Wed, 10 Nov 2010 14:03:16 +0000

On 10/11/2010 13:38, Costello, Roger L. wrote:
> Issue
>
> How should business rules be expressed? Should an XML Schema 1.1 document co-locate business rules and data rules? Or keep them separate?

First define your terms (you haven't done so, except by example). I'm 
not convinced there's a real difference. Unless perhaps your definition 
of "data constraint" is to say "there are many ways we could represent 
this information, and this is the way we have chosen" - e.g. that all 
dimensions should be expressed in cm - so the maximum size of a parcel 
is a business constraint, and the way the size is represented is a data 
constraint. But the boundary between the two is likely to be a fuzzy one 
much of the time.

Michael Kay
Saxonica

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