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Hi Folks,
Below are a few principles which I hold to be true:
1. Frequently, data endures but the applications which processes the
data comes and goes.
2. Separate everything:
- separate data from presentation
- separate data from applications that process the data
- separate semantic definitions from application code
- separate hyperlink definitions from data (put hyperlink
definitions in a linkbase)
2. Freedom is not "do anything you want". That is chaos. Unbridled XML
leads to chaos. Freedom is brought about through discipline. Bring
order to instance data by conforming to a design pattern.
The RDF Class/Property/Value design pattern seems like a
good choice to control the chaos.
3. Minimize exacting requirements on the *form* of instance documents.
Expect diversity of expression.
Corollary: In designing schemas apply liberal quantities
of <any> and <all>; minimize use of <sequence>
and minOccurs="1".
4. Take a step forward to machine understanding of instance data by
documenting how the data relates to other things in the world: How does
the class of data in the instance document relate to other classes of
data? What are the characteristics of the properties? Answers to these
questions constitute a logical model.
OWL seems like a good choice for declaratively expressing
logical models.
I invite your suggestions for deletions/extensions/modifications to this
list. /Roger
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