From: Laurentiu Iancu (firstname.lastname@example.org)
Date: Tue Jun 08 2010 - 12:39:26 CDT
The incorrect presence of break opportunities at SOT in LineBreakTest.txt is a known issue, documented in the erratum dated 2008-April-28 at http://www.unicode.org/errata/. The correct result at SOT is a no-break, in accordance to rule LB2.
From: email@example.com [mailto:firstname.lastname@example.org] On Behalf Of Konstantin Ritt
Sent: Tuesday, June 08, 2010 8:10 AM
To: Mark Davis ☕
Cc: Asmus Freytag; Masaaki Shibata; email@example.com
Subject: Re: Questionable lines on LineBreakTest.txt
2010/6/8 Mark Davis ☕ <firstname.lastname@example.org<mailto:email@example.com>>
> If the test files are "known to be in error", then those "known" cases need to be actually communicated back to the UTC; sitting on them doesn't do anyone any good.
> I have not had a chance to investigate, but this particular case may be covered by the description in http://unicode.org/Public/6.0.0/ucd/auxiliary/LineBreakTest-6.0.0d4.html:
> The Line Break tests use tailoring of numbers described in Example 7 of Section 8.2 Examples of Customization.
LB24 says: The default line breaking algorithm approximates this with the following (LB25) rule. Note that some cases have already been handled, such as ‘9,’, ‘[9’. For a tailoring that supports the regular expression directly, as well as a key to the notation see Section 8.2, Examples of Customization.
and there is a note in LineBreakTest*.txt file: Note: The Line Break tests use tailoring of numbers described in Example 7 of Section 8.2 Examples of Customization. They also differ from the results produced by a pair table implementation in sequences like: ZW SP CL.
but I have yet another question: why every test in LineBreakTest.txt assumes break opportunity at the start-of-text while LB2 says: Never break at the start of text ? if these tests are for "out of context" usage, where can i read such note?
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