Line breaking for Kanbun and Bopomofo characters

[Katsuhiko Momoi]

According to the "LineBreak-4.0.0.txt" accompanying  UTR #14, Kanbun 
characters are considered as the same as CJK ideographs and classified 
as "ID" class meaning, i.e. we should be able to line break before or 
after a character.

http://www.unicode.org/Public/4.0-Update/LineBreak-4.0.0.txt
http://www.unicode.org/reports/tr14
In Kanbun reading (classical Chinese), I always thought that these 
characters are a part of the preceding character so that a line should 
not break before it. For example, 0x3191 is an instruction to skip the 
preceding character and read the next character first and then come back 
to the preceding character.

Can someone on the list tell me the rationale for classifying them in 
the "ID" class?
The same question for Bopomofo characters.

Thanks,

- Kat

--
Katsuhiko Momoi
e-mail: [EMAIL PROTECTED]