[r-t] Delta-based transposition representation

[Alan Burlison]

On 10/06/2016 03:10, Don Morrison wrote:

> On Thu, Jun 9, 2016 at 7:22 PM, Alan Burlison <alan.burlison at gmail.com>
> wrote:
>> I'm not sure why having a representation that looks identical for
>> two different semantics is considered to be a bonus
>
> It's certainly not necessary, but it is sometimes convenient. For example,
> if you have any operations you want to be able to apply both to changes (in
> the more general sense, such as permutation operations of lead end and
> course ends and so on) and to rows (e.g. isInCourse()) you only have to
> write them once, not twice.

Ah yes, good point.

-- 
Alan Burlison
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