RFC 5891, "Internationalized Domain Names in Applications (IDNA): Protocol", August 2010

Errata ID: 3969
Status: Held for Document Update
Type: Editorial
Publication Format(s) : TEXT
Reported By: Peter Occil
Date Reported: 2014-04-19
Held for Document Update by: Barry Leiba
Date Held: 2014-04-21

Section 4.2.3.2 says:

The Unicode string MUST NOT begin with a combining mark or combining
character (see The Unicode Standard, Section 2.11 [Unicode] for an
exact definition).

It should say:

The Unicode string MUST NOT begin with a combining mark or combining 
character (as defined in The Unicode Standard, Section 3.6 [Unicode], 
definition D52).

Notes:

Section 2.11 of the Unicode Standard explains what combining characters are only in general terms. Section 3.6 contains the actual definition.

----- Verifier Notes -----
The actual fix is probably closer to changing "exact definition" to "explanation of combining characters," and leaving the reference alone. But discussion indicates that more clarification is probably good, and that clarification needs to be in the broader context of a document update.

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