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> I took the 10%, because I've once heard that data entry
> typists make around 10% mistakes. But whatever the number, it
> does not sound unreasonable that without validation the
> number of incorrect data would be a lot higher.
It depends a bit how many errors validation catches. Since phone numbers
have no check digit, most errors will get through anyway.
(and if they did have a check digit, you couldn't do the validation
using XML Schema...)