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From "Marko Asplund (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-1029) Illegal character replacements in ISOLatin1AccentFilter
Date Tue, 16 Oct 2007 06:59:51 GMT

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

Marko Asplund updated LUCENE-1029:
----------------------------------

    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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