Arxo Findings Register · Arxo Law

ARXO-2026-0468 · Reported

UAX #14 rev. 57, Section 5.1 SY: is “except in front of digits” limited to numbers?

The SY description says there is a break opportunity after a solidus except in front of digits. LB25 keeps SY × NU only after digits, so after a letter a solidus followed by a number allows a break.

Consequence

U+0061 U+002F U+0031: a break after the solidus, before the number.

Proposed correction

Say “except before digits when the solidus is part of a number, as in 1/2 or 06/07/99”.

Issued by
Unicode Consortium — Unicode Technical Committee
Act
UAX #14 revision 57 (Unicode 18.0.0)
Place
Section 5.1, class SY, against LB25
Record
Question of reading or data
Class
Question of reading or data
Where it arose
The text of the act
Arxo's conclusion
Confirmed
Official text
Unchanged at last check
Last checked
2026-10-31

Evidence

Contradiction within the text. Quotations are verbatim from the official material; translations are ours and marked.

The SY line breaking property is intended to provide a break opportunity after, except in front of digits, so as to not break “1/2” or “06/07/99”.
Normative text · UAX #14 revision 57 (Unicode 18.0.0), Unicode Consortium · Section 5.1, class SY, against LB25 · Unicode 18.0.0 · retrieved 2026-10-31 · SHA-256 296df5332aefe695b4951b511288b118bc6a7b43db7fadfd60f6062096acc7c0 · copy
NU ( SY | IS )* × NU
Normative text · UAX #14 revision 57 (Unicode 18.0.0), Unicode Consortium · rule LB25 · Unicode 18.0.0 · retrieved 2026-10-31 · SHA-256 296df5332aefe695b4951b511288b118bc6a7b43db7fadfd60f6062096acc7c0 · copy

How to check it without Arxo's tools

  1. Open UAX #14 revision 57 (Unicode 18.0.0), Unicode Consortium and find Section 5.1, class SY, against LB25; rule LB25. Compare the text with the quotation above. A copy is kept in this register: 296df5332aefe695-tr14-57.html (SHA-256 296df5332aefe695b4951b511288b118bc6a7b43db7fadfd60f6062096acc7c0, copy of the official file).
  2. The finding holds if the quoted passages read as shown and the comparison gives the result stated at the top of this page. If it does not, write to us with the record ID.

How this finding was made

AI agents read the annexes and the data files and compared them; the examples were run through published implementations. An AI coordinator checked each place against the full annex and the trackers, and two further AI models checked the report before filing.

Responsible institutions

Reported to

DateInstitutionChannelReference
2026-10-31Unicode Consortium — one PDF with 18 reportse-mailMessage-ID: <CAH-SH71i9Rky90g_YO=CGO3xx7NZFnEg==fkn2PuRp_7WpgjHw@mail.gmail.com>

Responses

No response recorded.

History

  1. 2026-10-31Confirmed by Arxo
  2. 2026-10-31Entered in the register
  3. 2026-10-31Reported to Unicode Consortium (e-mail)

Cite this record

Arxo Law, Arxo Findings Register, ARXO-2026-0468, https://arxo.io/findings/ARXO-2026-0468/ (status as of 2026-10-31). Data: ARXO-2026-0468.json.