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https://issues.apache.org/jira/browse/LUCENE-1390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12635594#action_12635594
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Steven Rowe commented on LUCENE-1390:
-------------------------------------
bq. It would be good to clarify how the goals of this issue differ from
LUCENE-1343 ... as an outside observer they seem to be the same thing
LUCENE-1343 depends on either Java 6 or an ICU jar. Java 5 support (much less
Java 6 support) is still a ways off, and core Lucene can't have external
dependencies. IMO, this issue intends to provide *core* Lucene support for
folding a wider set of accented characters to ASCII.
In a moment I'll attach a patch that, in addition to the larger set of accented
characters to be folded that Andi has provided, folds all Unicode characters I
could find to their ASCII equivalents.
> 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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