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https://issues.apache.org/jira/browse/LUCENE-3110?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steven Rowe resolved LUCENE-3110.
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Resolution: Won't Fix
See LUCENE-1696, where Robert Muir advocates using an ICU collation filter
instead of locale-sensitive accent stripping.
> ASCIIFoldingFilter wrongly folds german Umlauts
> -----------------------------------------------
>
> Key: LUCENE-3110
> URL: https://issues.apache.org/jira/browse/LUCENE-3110
> Project: Lucene - Java
> Issue Type: Improvement
> Components: modules/analysis
> Affects Versions: 3.1
> Reporter: Michael Gaber
>
> the german umlauts are currently mapped as follows.
> Ä/ä => A/a
> Ö/ö => O/o
> Ü/ü => U/u
> the correct mapping would be
> Ä/ä => Ae/ae
> Ö/ö => Oe/oe
> Ü/ü => Ue/ue
> so the corresponding rows in the switch statement should be moved down to the
> ae/oe/ue positions.
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