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

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> 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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