Potential Erratum re. length limits in RFC 5890
markus.icu at gmail.com
Wed Sep 29 00:12:38 CEST 2010
On Tue, Sep 28, 2010 at 3:02 PM, Kenneth Whistler <kenw at sybase.com> wrote:
> Those are the minimum and maximum cases. For some more
> typical mix of characters from the BMP, the UTF-8 length
> will be >= 63 and <= 252 octets.
Correct. (Or actually, with a "mix of characters from the BMP" you would get
at most 189 UTF-8 bytes.)
However, Martin quoted the RFC as saying
[...] U-labels that
obey all of the relevant symmetry (and other) constraints of these
documents may be quite a bit longer, potentially up to 252 characters
(Unicode code points).
How to 252 *Unicode code points* relate to the A-label length limit of 63
*octets* (where each is an ASCII letter or digit)?
(Aside from the xn-- prefix which reduces the label contents to 59 octets.)
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