[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Postel's Law Has No Exceptions
Dare Obasanjo wrote, > It's always amusing to see technologists blindly reciting anecdotal > statements about software development as if they are the laws of > Physics or were handed down from above on a fiery mountain. Except that Postel's is a better candidate for law of nature status than most. At the risk of stating the blindingly obvious: "be liberal in what you accept and conservative in what you send" can be read as an analog of the "contravariant argument types, covariant return types" function/ method typing rule familiar from the polymorphic typed lambda calculus and manifested in at least a few modern programming languages with well designed type systems. Given the solid basis for the rule, I'd say that there's a presumption in it's favour other things being equal. Other things aren't always equal tho', so there are going to be good grounds for local and limited violations. But in those cases the burden of proof is on the violators to come up with a persuasive justification. That's a bit weaker than a law of nature, but it's a good bit stronger than blind acceptance of anecdote. Cheers, Miles
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