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https://issues.apache.org/jira/browse/LUCENE-1029?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mark Miller closed LUCENE-1029.
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Resolution: Invalid
The new ASCIIFoldingFilter is the current best work on this. Future issues
should be targeted at that - but I think it does what we want it to do -
individual issues can be brought up if they exist.
> Illegal character replacements in ISOLatin1AccentFilter
> -------------------------------------------------------
>
> Key: LUCENE-1029
> URL: https://issues.apache.org/jira/browse/LUCENE-1029
> Project: Lucene - Java
> Issue Type: Bug
> Components: Analysis
> Affects Versions: 2.2
> Reporter: Marko Asplund
> Attachments: ISOLatin1AccentFilter-by-Collator.patch,
> ISOLatin1AccentFilter-javadoc.patch
>
>
> The ISOLatin1AccentFilter class is responsible for replacing "accented
> characters in the ISO Latin 1 character set by their unaccented equivalent".
> Some of the replacements performed for scandinavian characters (used e.g. in
> the finnish, swedish, danish languages etc.) are illegal. The scandinavian
> characters are different from the accented characters used e.g. in latin
> based languages such as french in that these characters (ä, ö, å) represent
> entirely independent sounds in the language and therefore cannot be
> represented with any other sound without change of meaning. It is therefore
> illegal to replace these characters with any other character.
> This means for example that you can't change the finnish word sää (weather)
> to saa (will have) because these are two entirely different words with
> different meaning. The same applies to scandinavian languages as well.
> There's no connection between the sounds represented by ä and a; ö and o or å
> and a.
> In addition to the three characters mentioned above danish and norwegian use
> other special characters such as ø and æ. It should be checked if the
> replacement is legal for these characters.
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