Precomposed form

Stephane Bortzmeyer bortzmeyer at
Wed Oct 20 15:08:01 CEST 2010

On Wed, Oct 20, 2010 at 08:09:25AM +0300,
 Abdulrahman I. ALGhadir <aghadir at> wrote 
 a message of 251 lines which said:

> any rule that decided whenever a sequence of code-points have a
> certain percomposed form

Normalizing with NFC should be enough, no? If NFC(sequence) !=
sequence, then the sequence of code points has a precomposed form.

> or if there is already a code-point which has an identical display
> as for a sequence code-points to be its precomposed form or not.

More difficult because "identical display" is out-of-scope for
Unicode: it depends on the font. (That's also why the entire issue of
homographs is moot.)

More information about the Idna-update mailing list