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https://issues.apache.org/jira/browse/LUCENE-1390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12631931#action_12631931
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Steven Rowe commented on LUCENE-1390:
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I think that at a minimum, the Latin Extended Additional block [U+1E00-U+1EFF]
should be added, since it is included in Unicode v3.0 (the version of Unicode
that Java 1.4.2 is conformant with), and it consists mainly of characters which
have exact diacritic-stripped ASCII versions. Wikipedia doesn't seem to have a
page for this block, and I can't find a code chart PDF for Unicode v3.0 on
unicode.org, so here's the PDF for Unicode v5.1 (the latest version):
http://www.unicode.org/charts/PDF/U1E00.pdf
Probably should check against the [Unicode 3.0 data
file|http://www.unicode.org/Public/3.0-Update1/UnicodeData-3.0.1.txt] to make
sure there haven't been any changes to this block between v3.0 and v5.1.0 -
i.e., to make sure that the above-linked PDF is accurate for Unicode v3.0.
There is one more Latin block listed in the [Unicode 3.0 blocks data
file|http://www.unicode.org/Public/3.0-Update/Blocks-3.txt]: [Latin
Extended-B|http://en.wikipedia.org/wiki/Latin_Extended-B_unicode_block]. Since
many of the characters in this block don't have exact diacritic-stripped ASCII
versions, maybe it could be argued that they shouldn't be included in this
filter. A fair proportion of them (maybe 40%), however, do.
> 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
> Attachments: 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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