--On Freitag, März 06, 2009 11:32:14 +0100 Andreas 'ads' Scherbaum
<adsmail@wars-nicht.de> wrote:
> No.
> Straight from the source:
>
> -- isn_weak(boolean) - Sets the weak input mode.
> -- This function is intended for testing use only!
>
>
> The validator function should use the weak mode for itself to return
> 'f' in case of invalid input. It cannot be the users job to make sure a
> validator function is working as expected.
>
I don't see anything that's not already documented. is_valid() checks the
presence of the invalid (!) marker only. It looks like the author never
intended is_valid() to be a "check wether this ISBN is semantically
correct", this is done by the input routines before.
I agree that the naming is a little bit misleading.
-- Thanks
Bernd
