RE: SUO: Re: Ballot Comment - 3D versus 4D.
>Dear Graham,
>
>No you do not sometimes need to say things 3D and sometimes 4D.
>Even when you do not specfiy when the start of an extent is for
>a 4D object, it still has one (and has to have one) - it just
>isn't known.
>
>4D actually allows you to say more and less than 3D, as you
>require. It might help to think of it as a RISC rather than
>CISC instruction set. In 4D you tend to get more, simpler
>statements.
I think that is slightly overstated. It depends on the details. One
does often need to be more prolix in a 4-d account, and this has been
used as a criticism (eg see my message to Adam making the contrast
with his example.)
Pat Hayes
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