Re: [xml-dev] Rick Jelliffe quotable quote on the purpose of schemas

• From: Rick Marshall <rjm@...>
• To: xml-dev@...
• Date: Wed, 13 Dec 2006 08:15:28 +1100

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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