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https://issues.apache.org/jira/browse/LUCENE-1390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12652831#action_12652831
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Robert Muir commented on LUCENE-1390:
-------------------------------------

sean... from your link: On 16th May 1992 the Latin alphabet for Azerbaijani was 
slightly revised - the letter ä was replaced with ə and the order of letters 
was changed as well. 

i've never seen 'ae' used in its place, certainly not in the Azeri text that I 
am indexing.

andi... im referring to the schwa character in azeri: U+018F (uppercase) and 
U+0259 (lowercase)

> add ISOLatinAccentFilter and deprecate ISOLatin1AccentFilter
> ------------------------------------------------------------
>
>                 Key: LUCENE-1390
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1390
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Analysis
>         Environment: any
>            Reporter: Andi Vajda
>            Priority: Minor
>             Fix For: 2.9
>
>         Attachments: ASCIIFoldingFilter.patch, ASCIIFoldingFilter.patch, 
> ISOLatinAccentFilter.java
>
>
> 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 blocks.
> See: http://en.wikipedia.org/wiki/Latin-1_Supplement_unicode_block
> See: http://en.wikipedia.org/wiki/Latin_Extended-A_unicode_block
> 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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