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   RE: RE: [xml-dev] Are people really using Identity constraints specified

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So many layers - so little time in life.

For more on layers see:


also Google on 'OSI layers' for more links (if this interests you!)

Just depends on which lines you want to draw in the sand and how

Quoting Michael Kay <michael.h.kay@ntlworld.com>:

> > 
> > I remember reading a long time ago a posting by David 
> > Megginson.  Paraphrasing, David said, "when dealing with XML 
> > you are working down at the bare metal".  
> > 
> > Other technologies work down at the bare metal, such as 
> > TCP/IP.  Perhaps there are lessons to be learned there?  
> > Certain TCP/IP packets are rejected as bad and the other 
> > packets are accepted and passed up to other layers, where 
> > those layers perform additional constraint checking.
> > 
> TCP is 4 layers above the bare metal, IP is 5 layers above, XML is 6 layers
> above, and a specific XML vocabulary (as described by a schema) is 7 layers
> above. Every layer in the protocol stack needs to check that its own rules
> are satisfied.
> Michael Kay 
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