RE: [xml-dev] Are people really using Identity constraints specified in XML schema?

["Hunsberger, Peter" <Peter.Hunsberger@STJUDE.ORG>]

rjelliffe@allette.com.au <rjelliffe@allette.com.au> writes:
> 
> Roger Costello wrote:
> 
> > How would you characterize the distinction between "business rules" 
> > and "constraints on data"?
> 
> Misleading. Or, rather, not a distinction that necessarily 
> should play a part in systems architecture, except as one 
> input to the design. In the same way, the distinction between 
> different kinds of user interfaces such as whether to use 
> field-level validation of forms, is useful as a design 
> consideration but not as the basic for an information architecture.
 
Yes, exactly, thank you for your clarity. Trying to come up with iron
clad rules on this doesn't seem productive.

<snip>More very good discussion generalizing this same point across many
aspects of this thread.</snip>