> > Even adding req() as a synonym for one-or-more() might be enough to
encourage people to write req(Document)/req(foo) in order to get better
diagnostics.
>
> Why not just:
>
>        req(Document/foo)
>

The finer-grained form would enable more precise diagnostics.

And they aren't equivalent: if there are two Document elements, only one of
which has a foo child, one expression would fail and the other would succeed.

Michael Kay
Saxonica