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RE: Are people really using Identity constraints specified in

• To: "'Cox, Bruce'" <Bruce.Cox@U...>, "Roger L. Costello" <costello@m...>, xml-dev@l...
• Subject: RE: Are people really using Identity constraints specified in XML schema?
• From: "Bullard, Claude L (Len)" <len.bullard@i...>
• Date: Tue, 17 Aug 2004 08:26:03 -0500

Good.

http://hbsworkingknowledge.hbs.edu/item.jhtml?id=4318&t=leadership

There is a snarky habit on some lists and in some discussions of 
dissing the XML-Dev habit of debating issues, some even non-XML 
related.  XML-Dev is one of the most consistently useful and 
informative lists precisely because of this.

1. The designer has a variety of options of where to put 
business rules.  Are business rules semantics?

2. What situational aspects determine where it is best to 
put these?  Some will argue that it is seldom best to put 
them in the schema because in a data-centric system, business 
rules act as the interpreter of the data and given several 
independently managed vertical semantic stacks, the first 
order of business is to ensure shared data is recognized, 
and then handled.

DTDs were successful because they did less of the latter. 
XML Schema, applied without some notion of independence, 
does too much of the latter.  RELAX NG is more constrained 
in what it can do, so it artificially restricts this 
application.   However in all cases, it is not the 
technology but the application design that is in 
question.

In CAD-to-CAD communications, we find that keeping the 
shared data description as simple as possible and avoiding 
the issues of command and control work best even though 
dispatch is essentially a command and control application. 
This is the distributed vs centralized issue that comes 
up again and again in the 911 hearings and in most 
situated network designs.   Collaborative networks have 
aspects that are similar to the problems described in the 
article cited above.

len

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