> > Is there a reason the operators described within the op:
> > namespace in the CR are not available?  I began with statements like:
> >
> > op:subtract-dates($earlier, $later)
>
> It might be better to ask, is there any reason that the operators of the
> language are specified by reference to a notional function library that
> exists only for the purpose of specifying operators? The answer is that
> someone thought that would be an elegant way of doing it. Readers may
> disagree.

Just to be clear on this one, there is no such function as
op:subtract-dates() (or any prefixed with op:) and it's in the CR
purely to demonstrate $earlier and $later?  Is that what you are
saying?