Transform rule syntax clarifications

[Cameron Dutro via CLDR-Users]

Ah ok, that explains why it's difficult to Google for this. The asymmetric
difference is simply the removal of every instance of the elements of one
set from another, but because sets only contain unique elements by default,
the asymmetric difference is really just the set difference. Does that
sound about right?

Glad the wording will be adjusted in the docs :)

-Cameron

On Sat, Nov 16, 2019 at 6:39 PM Richard Wordingham via CLDR-Users <
cldr-users at unicode.org> wrote:

> On Sat, 16 Nov 2019 13:18:00 -0800
> Cameron Dutro via CLDR-Users <cldr-users at unicode.org> wrote:
>
> > The other bits of syntax you've mentioned are from the Unicode Set
> > specification, which you can find in UTS #35
> > <https://unicode.org/reports/tr35/#Unicode_Sets>. Unicode Sets are
> > like regex character classes, but as you've noticed, there are a
> > couple of special operations they support that regexes don't.
> > Specifically, the "-" operator is the symmetric difference
> > <https://en.wikipedia.org/wiki/Symmetric_difference> between the two
> > operands (UTS 35 says "asymmetric difference," but I don't think
> > that's a thing - I can't find any definition of it online).
>
> It very much is a thing!  In this particular case,
>
> $accent_minus = [[$accent]-[$iotasub$macron]];
>
> is probably the same as the symmetric difference, because from
> the names i think everything in the second set is in the first set, but
> this doesn't always apply.  [abcd] - [abef] is [cd], not the symmetric
> difference [cdef].
>
> Richard.
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