Transform rule syntax clarifications

[Mark Davis ☕️ via CLDR-Users]

I was about to point people to that, and request people to add additional
comments on clarifications of the syntax, but I couldn't find your ticket
at https://unicode-org.atlassian.net/issues/?filter=10033. Did you file it
for CLDR?

Mark


On Mon, Nov 18, 2019 at 9:03 AM Martin J. Dürst <duerst at it.aoyama.ac.jp>
wrote:

> On 2019/11/18 17:22, Mark Davis ☕️ wrote:
> > It should use A∖B when taking about the math operation. Could you file a
> > ticket?
>
> Done.   Regards,   Martin.
>
> > {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.
> >
>
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