> Date: Mon, 10 Oct 2011 18:24:09 +0800
> From: li bo <[email protected]>
> Cc: [email protected]
> 
> ‘You cannot do this in the first place, because the parts of the UBA
> before that need to distinguish between segment separators, paragraph
> separators, and whitespace.’
> I think you lose a ‘not’ behind 'need'. Is that right?

No, the text is correct as written.

>From the beginning of UBA, where you see the first call to `classify',
and up until L1, segment separators, paragraph separators, and
whitespace characters are processed differently.  So the first call to
`classify' returns their nominal types.  In L1, segment separators,
paragraph separators, and whitespace characters are treated in the
same way, and so `classify' returns their types folded to a single
type "N".

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