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https://issues.apache.org/jira/browse/LUCENE-1390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12632706#action_12632706
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Steven Rowe commented on LUCENE-1390:
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bq. The Extended-C and D blocks also have relevant things to include
These two blocks were not included in Unicode 3.0, the version supported by
Java 1.4.2, which is the Java version that Lucene 2.X supports.
Nevertheless, the ranges these two blocks occupy in Unicode 5.1 are
non-characters in Unicode 3.0, so I don't think it would be a problem to add
them.
I'll take a look at adding more stuff this weekend.
I also will add the Unicode character descriptions to the comments for each
character (e.g. "LATIN CAPITAL LETTER A WITH MACRON").
> 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: 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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