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Agreed. This is at the top of the frequently asked questions I get about XML. The fact that nobody has come up with a simple and elegant solution leads me to believe that there isn't one, as does the fact that nobody has solved this in non-XML fields (database schemas, APIs, operating systems, etc.) either. -- Ron Ian Graham wrote: > My own experience, on a large enterprise Web services project, is that > elegant schema / WSDL evolution is not possible. There is simply no way > to constrain the schema changes such that all existing applications are > guaranteed to work with the new versions. So we will create new services > (and keep the old) if anything needs to change. We hope that governance > will help limit/control this revving process. > > The situation is likely similar for other environments -- if you want to > guarantee that all previous apps dependent on the schema work, then you > can't change it. > > If you think a schema change is idiot proof, you likely just haven't > found a suitably qualified idiot :-(
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