RE: Are people really using Identity constraints specified in
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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