Transform rule syntax clarifications

[Mark Davis ☕️ via CLDR-Users]

Thanks! For cldr/ldml/ICU wer habe real big tracking systems.

I'll move it.

{phone}

On Mon, Nov 18, 2019, 10:50 Martin J. Dürst <duerst at it.aoyama.ac.jp> wrote:

> Hello Mark,
>
> On 2019/11/18 19:41, Mark Davis ☕️ wrote:
> > 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?
>
> I filed it at https://www.unicode.org/reporting.html, because I thought
> that that was where to file for UTS #35. Feel free to transfer it from
> there to wherever you think it should go.
>
> Regards,   Martin.
>
> > 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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