SG16 will hold a meeting on Wednesday, June 11th, at 19:30 UTC (timezone
conversion
<https://www.timeanddate.com/worldclock/converter.html?iso=20250611T193000&p1=1440&p2=tz_pdt&p3=tz_mdt&p4=tz_cdt&p5=tz_edt&p6=tz_cest>).

If you need a .ics file to import into your calendar, you can download
it here
<https://documents.isocpp.org/remote.php/dav/public-calendars/R7imgS2LJD9xfeWN/94A3D3A0-70B9-4847-935F-9453DB2BB216.ics?export>.

The agenda follows.

  * CWG2843: Undated reference to Unicode makes C++ a moving target
    <https://cplusplus.github.io/CWG/issues/2843.html>.
  * D3727R0: Update Annex E onto Unicode 15.1
    <https://isocpp.org/files/papers/D3727R0.pdf>.
  * P3717R0: Update Annex E onto Unicode 16 <https://wg21.link/p3717r0>.

SG16 previously reviewed *CWG2843* during the 2024-01-10
<https://github.com/sg16-unicode/sg16-meetings/blob/master/README-2024.md#january-10th-2024>,
2024-02-07
<https://github.com/sg16-unicode/sg16-meetings/blob/master/README-2024.md#february-7th-2024>,
and 2024-02-21
<https://github.com/sg16-unicode/sg16-meetings/blob/master/README-2024.md#february-21st-2024>
SG16 meetings. Those meetings culminated in consensus to specify Unicode
15.1 as the minimum version for C++26 (and C++23 as a DR) with an
allowance for use of a more recent Unicode version in conforming
implementations. EWG confirmed this direction during its 2024-03
in-person meeting in Tokyo
<https://wiki.edg.com/bin/view/Wg21tokyo2024/NotesEWGCWG2843>. Since
then, the issue has been awaiting proposed wording that includes an
update to the non-normative content of annex E. Steve recently published
*P3717R0* with the minimal wording needed to update annex E, but with
additional scope to bump the minimum Unicode version to 16. Push back on
the additional Unicode version change lead Jens to update the proposed
resolution in CWG2843 (see the "Additional notes (May, 2025)" section)
to apply the minimal update to annex E. Meanwhile, Steve authored
*D3727R0* which retains the Unicode 15.1 direction already approved by
EWG, but with additional suggested updates for annex E that go beyond
the minimum strictly necessary to resolve CWG2843; see related
discussion on the SG16 mailing list
<https://lists.isocpp.org/sg16/2025/05/4581.php> and in particular,
Robin Leroy's comments <https://lists.isocpp.org/sg16/2025/06/4584.php>
that motivated the additional changes. The goal of this meeting will be to:

 1. Determine the minimum Unicode version to recommend as the normative
    reference in the C++ standard with acknowledgment of the following:
     1. EWG has already approved Unicode 15.1 as a DR for C++23.
     2. A recommendation to move to Unicode 16 will require an audit to
        address impact from the rebase, approval from EWG, and,
        presumably, divergence from C++23 since updating C++23 to depend
        on a standard that had not yet been published when C++23 was
        published would be ill-advised. Note that no features added to
        C++26 depend on Unicode 16.
 2. Determine the scope of changes to make to annex E:
     1. The minimal change needed to resolve CWG2843 (the removal of
        [uaxid.def.rfmt] <https://eel.is/c++draft/uaxid#def.rfmt> as in
        the May 2025 proposed resolution in CWG2843), or
     2. The larger set of changes as proposed in D3727R0 (possibly with
        additional refinement per discussion on the SG16 mailing list
        and any further discussion).

I haven't scheduled any other papers or topics for this meeting so as to
maximize our chances of reaching a final consensus on this issue.

*Steve, Robin, and Jens*: it would be great if the three of you could
collaborate to reach agreement on a unified proposal prior to this
meeting (I recognize time is short to do so).

Tom.