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   Re: [xml-dev] XML: logical and/or physical model?

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----- Original Message ----- 
From: "David Megginson" <dmeggin@attglobal.net>
To: "XML Developers List" <xml-dev@lists.xml.org>
Sent: Friday, May 28, 2004 10:52 AM

> Michael Champion wrote:
> > As I understand it, it is the job of the RDBMS implementation to  
> > perform whatever mapping from the logical to physical world is needed  
> > to do this efficiently. [1]  Perhaps one  advantage of XML is that it  
> > just blows off this distinction -- it gets a lot of its practical power  
> > by 'modeling' relationships as *physical* containment of a set of  
> > elements (which of course may be subtrees) inside other elements.
> I'd suggest a slightly different focus: the physical model is private while 
> the logical model is public.  XML is designed to handle the public, logical 
> part so that people can share information without being forced to use the 
> same physical models.

Maybe one could constrain this somewhat and say that XML is best suited to
handling a specific view of the logical model, rather than *representing*
an applications logical model.



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