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> ... What I'd like to see are examples and design
> patterns that show how subtitution groups and abstract types
> can be used to build polymorphic apps that adapt well to
> schema evolution.
I think that's an excellent suggestion for an addition to the Best Practices
web site. There's already some coverage there on Schema versioning
(thanks, Priscilla); Schema robusting(?) would go hand-in-hand with that. I
offer some thoughts on that subject in soon-to-be published book
<?whoTooted?>, but an open discussion of tried and true approaches would
certainly educate us all.