split-sequence: position() and last()

Ages ago, before we adopted p:iteration-position() and
p:iteration-size(), we thought that we'd overload the standard
position() and last() functions for that purpose.

In that world, it was possible to imagine that you could get
"head" and "tail" from split-sequence:

  <p:split-sequence name="head" test="position() = 1"/>

and

  <p:split-sequence name="tail" test="position()=last()"/>

That's not true anymore. And you can't use iteration position and size
here.

So there's no efficient way to get the head or tail of a sequence.

Bleh.

I fear we should fix that.

                                        Be seeing you,
                                          norm

-- 
Norman Walsh <ndw@nwalsh.com> | It is a paradoxical but profoundly true
http://nwalsh.com/            | and important principle of life that
                              | the most likely way to reach a goal is
                              | to be aiming not at that goal itself
                              | but at some more ambitious goal beyond
                              | it.--Arnold Toynbee