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From "Andi Vajda (JIRA)" <>
Subject [jira] Commented: (LUCENE-1390) add ISOLatinAccentFilter and deprecate ISOLatin1AccentFilter
Date Wed, 03 Dec 2008 18:05:44 GMT


Andi Vajda commented on LUCENE-1390:

Ah, I see now what you're asking for. Sorry about the misunderstanding.
I believe I had picked 'e' for schwa because it looks closest to that 
letter. I have no objections to switching to using 'a' instead if that's 
more "correct".
This Wikipedia seems to agree:
This other Wikipedia is less clear about 
this, but it seems that using 'a' instead of 'e' doesn't contradict it.

Steven, I can amend the patch but you said you had more changes coming. If 
that's the case, could you please add this change as well. If that's not the 
case, is it ok for me to add this change and call for this bug to be 
committed to trunk and closed ?

> add ISOLatinAccentFilter and deprecate ISOLatin1AccentFilter
> ------------------------------------------------------------
>                 Key: LUCENE-1390
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Analysis
>         Environment: any
>            Reporter: Andi Vajda
>            Priority: Minor
>             Fix For: 2.9
>         Attachments: ASCIIFoldingFilter.patch, ASCIIFoldingFilter.patch,
> The ISOLatin1AccentFilter is removing accents from accented characters in the ISO Latin
1 character set.
> It does what it does and there is no bug with it.
> It would be nicer, though, if there was a more comprehensive version of this code that
included not just ISO-Latin-1 (ISO-8859-1) but the entire Latin 1 and Latin Extended A unicode
> See:
> See:
> That way, all languages using roman characters are covered.
> A new class, ISOLatinAccentFilter is attached. It is intended to supercede ISOLatin1AccentFilter
which should get deprecated.

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