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https://issues.apache.org/jira/browse/LUCENE-3110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13034709#comment-13034709
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Robert Muir commented on LUCENE-3110:
-------------------------------------
Hi,
these characters are not German umlauts. They are unicode characters used
by a number of languages. the purpose of ASCIIFolding is to do simple
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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