Transform rule syntax clarifications

[Mark Davis ☕️ via CLDR-Users]

It should use A∖B when taking about the math operation. Could you file a
ticket?

{phone}

On Mon, Nov 18, 2019, 04:42 Martin J. Dürst via CLDR-Users <
cldr-users at unicode.org> wrote:

> On 2019/11/17 11:37, Richard Wordingham via CLDR-Users 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!
>
> Well, yes, except that it's usually just called "set difference" without
> an explicit adjective. (I'd strongly suggest that UTS 35 put the word
> 'asymmetric' in parentheses.) Also, one wouldn't use the symbol '-' for
> symmetric difference.
>
> Regards,   Martin.
>
> > 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.
>
> _______________________________________________
> CLDR-Users mailing list
> CLDR-Users at unicode.org
> http://unicode.org/mailman/listinfo/cldr-users
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://unicode.org/pipermail/cldr-users/attachments/20191118/b39f232c/attachment.html>