The title "Find with XPath over file system" is a bit misleading. It is not the first time when I've got a question like:
When you say "The standard UNIX utility find now supports XPath", does that mean that this will be included in the standard find?
The answer is:
No, it will never be included in the standard find: http://lists.gnu.org/archive/html/bug-findutils/2005-01/msg00107.html, and I completely agree.
It looks like the title is a bit misleading. I wanted to emphasize that I hadn't written a program from scratch, but added the XPath facility to a legacy code, and the legacy code is the standard find.