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‘Constrain your data early and often’
— C. M. Sperberg-McQueen
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many editors have validators wrapped-in (Emacs/psgml,
oXygen, jEdit) or built-in (Emacs/nxml)
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IMHO validators (often called ‘parsers’, which are a
superset) should be judged on
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correctness
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usefullness of error messages
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speed (to the human)
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