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RE: Use of XML ?

Something to keep in mind, the model of contract-based 
communication espoused in countless articles on XML, 
WSDL, SOAP, etc. isn't new or even novel to markup systems. 
There is literature on all of this in the CALS days 
related to the C3I model of military command, control 
and communications.  In C3I, the central problem is 
not efficiency; it is mission success given capability. 
Cost is relative to criticality.

To work out some of the probable results, one looks 
at the contrasting styles of the cold war militaries, 
eg, Soviet and American, and compares understands where 
and how each was successful.  One can have a *loosely coupled* 
chain of command with varying degrees of autonomy and 
cohesion, and that works very well for some situations. 
In other situations, say where coordination of assets 
and effort are required, one can optimize efficiency by 
reducing the autonomy, or one can increase the assets 
and accept losses as the cost of achieving the mission.

The "pioneers" of XML should study these models.  There 
are costs in loose contracts and costs in tight contracts. 
The question is one of what kinds and types of losses can 
be sustained given availability and sustainment costs.

The Korean conflict (1950-53) is particularly illuminating.

Len Bullard
Intergraph Public Safety

Ekam sat.h, Vipraah bahudhaa vadanti.
Daamyata. Datta. Dayadhvam.h