Am Freitag, 29. Februar 2008 schrieb Tom Lane:
> Sergey Burladyan <eshkinkot(at)gmail(dot)com> writes:
> > [ xmlvalidate is a security hole ]
>
> Given that this function is not documented nor tested in the regression
> tests, I propose diking it out entirely.
Yes, it was accidentally left over from previous work. We should have removed
it before the release, but that would have required an initdb.