“Ch-ch-ch-changes” sang David Bowie, “Just gonna have to be a different man. Time may change me but I can’t trace time.” It’s a great idea for a song, but when moving to the next version of an XML-based exchange, we would like a transition with less stutter. However, this is not easy: on one hand, we want old version processors to accept new messages, the way older browsers can display newer HTML by ignoring unknown tags. On the other hand, those “mustIgnoreUnknown” semantics are often unwanted.
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