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> > maintenance. A trememdous side-effect of XML adoption is that it's > > encouraging developers to finally start putting these matters in the > > right order. > > How is this different from the days of SQL databases? Hierarchical to relational mapping is harder than hierarchical to hierarchical mapping. There's no silver bullet, but the doors open to create a data model maps well to a class's type and containment hierarchy. For example, XML Schema describes both. Whether is maps well to Java or C++ is an open question, although groups are working on it. And SQL databases will be around a long time yet. On problem in mapping class data to databases is finding the class data to store and navigating to it. The other is making sure the class constraints that control input match those that are defined in the database schema, or you'll get runtime problems. The reverse process, DB->class members is much fun either. At least with a schema that describes internal data structure operated on by the class, the constraints and structure can more easily be ascertained and mapped.
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