• To: 'Jonathan Borden' <jborden@m...>, David Brownell <david-b@p...>, Joe English <jenglish@f...>, xml-dev@l..., Tim Bray <tbray@t...>
• Subject: RE: s-expressions and XML was Re: terra incog nita
• From: Jeff Lowery <jlowery@s...>
• Date: Tue, 18 Dec 2001 11:35:32 -0800

> Regarding objects vs. data (which is where we started), the prime
> distinction is between opacity and translucency. When objects are well
> described, and their state can be described by the getter 
> setter properties
> in their interfaces, as data objects they can be translucent. 

What of:
- cardinality?
- max/min values?
- co-constraints?

These are not translucent in the interface, and point up the limitations of
expressing a data model as a set of object interfaces. While the line
between processing/data model is gray, there's a lot to be gained by
expressing certain constraints declaratively (in a schema, not IDL).

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