Why doesn't Ideographic (ID) in UAX#14 have half-width katakana?

[Werner LEMBERG]

> However, the most important property is to be able to start a new
> line after (almost) any half-width kana.

Bad formulation, sorry.  I mean:

  However, the most important property is to be able to break a line
  after (almost) any half-width kana.


    Werner