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   Re: [xml-dev] What is coupling? [Was: 3 XML Design Principles]

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Bullard, Claude L (Len) wrote:
> Cohesion and coupling:
> and of course, the ultimate expression of homophilic principles, the Law of
> Demeter: 
> "Only talk to your friends."  For programmers, there are lots of articles on
> this one.
> http://www.cmcrossroads.com/bradapp/docs/demeter-intro.html

I am having trouble applying OO to XML, but I read this from the above 

"The Law of Demeter says that if I need to request a service of an 
objects sub-part, I should instead make the request of the object itself 
and let it propagate this request to all relevant sub-parts, thus the 
object is responsible for knowing its internal make-up instead of the 
method that uses it."

To me, if I have a nested structure in an XML instance and using XSL on 
that I apply-templates (flow through the instance doc) and only do what 
is in the XML. If I come across something that is a reference to 
something else I can go out, get it, apply-templates on it and continue 
where I left off.

If I have a flat structure in an instance doc I have to assume where 
things go and place them in a more rigid way.

Am I just not getting it?


> len
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