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https://issues.apache.org/jira/browse/LUCENE-1390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12652834#action_12652834
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Robert Muir commented on LUCENE-1390:
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with regards to transliteration the bgn/pcgn standard states:
The special letter Ə, ə known as schwa, should be reproduced in that form
whenever encountered.
Use Ә (U+04D8) and ә (U+04D9) for schwa when writing in the Cyrillic script,
but use Ə (U+018F) and ə (U+0259) for schwa when writing in the Roman alphabet.
In those instances when it cannot be reproduced, however, the letter Ä ä may be
substituted for it.
http://earth-info.nga.mil/gns/html/Romanization/Romanization_Azerbaijani.pdf
> 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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