Illegal character replacements in ISOLatin1AccentFilter
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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
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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