On tis, 2010-07-27 at 16:33 -0700, David Fetter wrote:
> * Do we already have it?
>
> Not really. There are kludges to accomplish these things, but
> they're available mostly in the sense that a general-purpose
> language allows you to write code to do anything a Turing machine
> can do.
I think this has been obsoleted by the xmlexists patch.