Since the derivation methods for complex types do not widen the scope of structures that can be defined by W3C XML Schema and are rather complex, their usage is controversial. Kohsuke Kawaguchi has published a convincing article on XML.com (http://www.xml.com/pub/a/2001/06/06/schemasimple.html) that explains how to avoid using complex type derivations without losing much in modularity.
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