XML doesn't validate itself either. It requires the use of external software to validate it. So, if you're concerned about the integrity of your database and you receive CSV data, you could just as easily write external software to validate that as well.

(If you reply with something along the lines of "But it's easier to write a DTD and feed it through a generic validator than it is to roll your own CSV validator", please provide concrete evidence to back this up. Based on the few examples I've seen, DTDs seem to be a programming language unto themselves, no less complex (and far more verbose) than the level of perl code that would be required for this task.)

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