& XSLT It's more like a classification thing. The structure determines the 
category or "family" - eg it's a car. The constraints determine the 
classification - it's a Toyota Camry which can come in these colours 
only etc .... The conforming instance defines the individual.

As a design technique it's invaluable.

Rick

Greg Alvord wrote:
>  Rick Marshall Wrote: This is a long way of saying that I think trying to get
>  one tool to do 2 fundamentally different things is always going to less than
>  optimal.
> 
>  Perhaps the view that structure and constraints are two separate things
>  comes from that fact that to tools we use treats them separately.
> 
>  At the semantic level structure defines relationships.  The constraints of
>  the semantic definitions are not separate from the definitions but part of
>  it. Constraints like "If the parent has this value in that property then
>  there must be a child of this type" do not operate separately from the
>  semantic definitions.  They are integral to the semantic definitions.
> 
> 
>  Greg
> 
>  Optimal Blue
> 
> 
> 
> 
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