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From "Mark Miller (JIRA)" <j...@apache.org>
Subject [jira] Closed: (LUCENE-1029) Illegal character replacements in ISOLatin1AccentFilter
Date Wed, 12 Aug 2009 00:06:14 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-1029?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mark Miller closed LUCENE-1029.
-------------------------------

    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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