Re: [xtm-wg] [XTM-CMS] Is there no data model?

["W. Eliot Kimber" <eliot@isogen.com>]

Chris Angus wrote:

> I think that many people involved in data modelling have paid only 'lip
> service' to the notions of different forms and levels of data model as laid
> out by ANSI/SPARC, etc.  We see conceptual, logical and physical data models
> (or whatever other terms one cares to use) that are almost identical.  Much
> of my work tends to be with systems where the physical data model bears
> little structural resemblance to the logical data models that map to it or
> to the business data models that are being handled.  Systems of this nature
> have much simpler underlying physical and logical data models and are much
> more robust in the face of change.

In the original data modeling work that I led, we had from the start
identified
three models: the pure abstraction, the implementation ("grove") model,
and the
syntax model.  We only had time to develop the abstract model
completely, although
Pete N. did develop a property set from which I created an initial
implementation
model. The syntax model is a straight transliteration of the syntax
spec, so it
is essentially an exercise for the reader.

Cheers,

E.

-- 
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W. Eliot Kimber | Lead Brain

1016 La Posada Dr. | Suite 240 | Austin TX  78752
    T 512.656.4139 |  F 512.419.1860 | eliot@isogen.com

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