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Date: Tue, 17 May 2011 13:36:47 +0000 (UTC)
From: "Steven Rowe (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
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Subject: [jira] [Resolved] (LUCENE-3110) ASCIIFoldingFilter wrongly folds
 german Umlauts
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     [ https://issues.apache.org/jira/browse/LUCENE-3110?page=3Dcom.atlassi=
an.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Rowe resolved LUCENE-3110.
---------------------------------

    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.
> =C3=84/=C3=A4 =3D> A/a
> =C3=96/=C3=B6 =3D> O/o
> =C3=9C/=C3=BC =3D> U/u
> the correct mapping would be
> =C3=84/=C3=A4 =3D> Ae/ae
> =C3=96/=C3=B6 =3D> Oe/oe
> =C3=9C/=C3=BC =3D> Ue/ue
> so the corresponding rows in the switch statement should be moved down to=
 the ae/oe/ue positions.

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