UAX #14 rev. 57, Section 10 Table 4: rows LB12a and LB12b do not match Section 6 or the test rules

Table 4 numbers the test rules “LB12a | 12.0 | GL ×” and “LB12b | 12.1 | [^SP, BA, HY] × GL”. Section 6 has no rule LB12b: it has LB12, “GL ×”, and LB12a, “[^SP HY HH] × GL”, and the Modifications section records that Unicode 18.0 removed BA from LB12a. Both rows are one rule name off, and the formula of row 12.1 predates both recent changes of LB12a.

Consequence

U+2013 EN DASH (BA in 18.0), U+00A0 NO-BREAK SPACE, U+0061, position 1: LB12a and LineBreakTest.txt give no break; the formula of Table 4 allows a break.

Proposed correction

Read “LB12 | 12.0 | GL ×” and “LB12a | 12.1 | [^SP HY HH] × GL” in Table 4.

Issued by

Unicode Consortium — Unicode Technical Committee

Act

UAX #14 revision 57 (Unicode 18.0.0)

Place

Section 10, Table 4

Record

Discrepancy

Class

Text of the act

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.

LB12a | 12.0 | GL ×

LB12b | 12.1 | [^SP, BA, HY] × GL

LB12a Do not break before NBSP and related characters, except after spaces and hyphens. [^SP HY HH] × GL

Changed rule LB12a to disallow a break between BA and GL, e.g., between EN DASH and NO-BREAK SPACE. [187-C46]

How to check it without Arxo's tools

1. Open UAX #14 revision 57 (Unicode 18.0.0), Unicode Consortium and find Section 10, Table 4. 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

• Unicode Consortium — publishes the annex and the Unicode Character Database

Reported to

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 (web form)

Cite this record

Arxo Law, Arxo Findings Register, ARXO-2026-0457, https://arxo.io/findings/ARXO-2026-0457/ (status as of 2026-10-31). Data: ARXO-2026-0457.json.