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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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Marko Asplund updated LUCENE-1029:
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Attachment: ISOLatin1AccentFilter-javadoc.patch
I think the class javadoc is very misleading so I'm attaching a documentation
patch.
For one the scandinavian characters do not contain diacritical marks or
accents. The dots in ä and ö as well as the ring in å is considered part of
the letter, not diacritics. The class name implies that it does something with
accents so for this reason I would not have expected the class to replace the
scandinavian characters.
The javadoc also says it replaces characters with their "equivalent" ASCII
characters. There are no equivalents for the scandinavian characters.
> 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-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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