In the production of the normalization tables for Unicode 3.0, the
character U+FB1D HEBREW LETTER YOD WITH HIRIQ was mistakenly omitted
Composition Exclusions. During the public review period, this
mistake was reported, but the report was misinterpreted and thus
Unicode 3.1, this character is now included in Composition
This particular change does affect backwards compatibility of
Normalization forms NFKC and NFC for strings containing this
character. It is recommended that all implementations for these
Normalization forms upgrade to the Unicode 3.1 data tables.
Policies. The Unicode Technical Committee has authorized a
change in Composition Exclusions in Unicode 3.1 to correct this
omission. The officers of the Unicode consortium have also approved this
change. The reasons for the exceptional decision are that:
- The omission had been reported during the public review period for
- There were no normative references to Unicode 3.0 Normalization
from our liaison organizations (particularly IETF and W3C), although
normative references are expected soon after Unicode 3.1.
- YOD WITH HIRIQ is one of a class of characters ("marked" Hebrew
presentation forms within the range U+FB1D .. U+FB4E) that were to be
handled all in the same way, during all review and discussion of
Normalization in the UTC. The other characters in this class were
uniformly included in Composition Exclusions.
- YOD WITH HIRIQ is a very rare character. The amount of existing
data containing it is infinitesimal as a proportion of all
computerized text. Even if it takes some time for implementations to
upgrade, this change should pose no significant
backwards-compatibility issue in practice.
No future changes will be made to normalization that would affect
backwards compatibility; no other characters could satisfy these
criteria in the future.