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   Re: [xml-dev] A few lessons I have learned (June, '03)

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- separate semantic definitions from application code

WSDL definitions (Operations, Messages, Parts, etc. are often dependent
on the systems that consume and process the messages whose format the
WSDL document describes - for example, "getLastTradePrice" may be the
name of an executable module on the receiver side (a Java Bean, C++
program, etc.). Does this violate the above principle? (in other words,
is the principle accurate?)

Kind Regards,
Joe Chiusano
Booz | Allen | Hamilton

"Roger L. Costello" wrote:
> 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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tel;work:(703) 902-6923
org:Booz | Allen | Hamilton;IT Digital Strategies Team
adr:;;8283 Greensboro Drive;McLean;VA;22012;
title:Senior Consultant
fn:Joseph M. Chiusano


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