i’m on a msdn blog spree for a bit. here is dare obasanjo with Designing XML Formats: Versioning vs. Extensibility

Many people designing XML formats whether for application-specific configuration files, website syndication formats or new markup languages have to face the problem of how to design their formats to be extensible and yet be resilient to changes due to changes to versions of the format. One thing I have noticed in talking to various teams at Microsoft and some of our customers is that many people think about extensibility of formats and confuse that for being the same as the versioning problem.

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