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RE: RE: Are people really using Identity constraints specified

• To: Michael Kay <michael.h.kay@n...>
• Subject: RE: RE: Are people really using Identity constraints specified in XML schema?
• From: w3c@d...
• Date: Thu, 19 Aug 2004 07:44:33 -0400
• Cc: costello@m..., xml-dev@l...
• In-reply-to: <20040819090735.MOBK12743.mta01-svc.ntlworld.com@Turtle>
• References: <20040819090735.MOBK12743.mta01-svc.ntlworld.com@Turtle>
• User-agent: Internet Messaging Program (IMP) 3.2.2 / FreeBSD-4.8

So many layers - so little time in life.

For more on layers see:

 http://www.uwsg.iu.edu/usail/network/nfs/network_layers.html

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
many...

DW
==============================================================
Quoting Michael Kay <michael.h.kay@n...>:

> > 
> > 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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• References:
  • RE: RE: Are people really using Identity constraints specified in XML schema?
    • From: "Michael Kay" <michael.h.kay@n...>

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