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Why are types not mentioned in that registry treated as errors instead of something less critical like notices or warnings? Does this prevent people from proposing new types or actually cause people to put everything into that registry?
In HTML5 there is a more or less flexible registry for rel-types (link[rel=...]). Why are types not mentioned in that registry treated as errors instead of something less critical like notices or warnings? Does this prevent people from proposing new types or actually cause people to put everything into that registry?
