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Date: Mon, 19 Apr 2010 04:53:13 -0400 (EDT)
From: "Robert Muir (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Updated: (LUCENE-1343) A replacement for AsciiFoldingFilter
 that does a more thorough job of removing diacritical marks or non-spacing
 modifiers.
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     [ https://issues.apache.org/jira/browse/LUCENE-1343?page=3Dcom.atlassi=
an.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Muir updated LUCENE-1343:
--------------------------------

              Summary: A replacement for AsciiFoldingFilter that does a mor=
e thorough job of removing diacritical marks or non-spacing modifiers.  (wa=
s: A replacement for ISOLatin1AccentFilter that does a more thorough job of=
 removing diacritical marks or non-spacing modifiers.)
        Fix Version/s: 3.1
    Affects Version/s: 3.1
        Lucene Fields: [New, Patch Available]  (was: [New])
          Description:=20
The ISOLatin1AccentFilter takes Unicode characters that have diacritical ma=
rks and replaces them with a version of that character with the diacritical=
 mark removed.  For example =C3=A9 becomes e.  However another equally vali=
d way of representing an accented character in Unicode is to have the unacc=
ented character followed by a non-spacing modifier character (like this:  =
=C3=A9  )    The ISOLatin1AccentFilter doesn't handle the accents in decomp=
osed unicode characters at all.    Additionally there are some instances wh=
ere a word will contain what looks like an accented character, that is actu=
ally considered to be a separate unaccented character  such as  =C5=81  but=
 which to make searching easier you want to fold onto the latin1  lookalike=
  version   L  .  =20

The UnicodeNormalizationFilter can filter out accents and diacritical marks=
 whether they occur as composed characters or decomposed characters, it can=
 also handle cases where as described above characters that look like they =
have diacritics (but don't) are to be folded onto the letter that they look=
 like ( =C5=81  -> L )

  was:
The ISOLatin1AccentFilter takes Unicode characters that have diacritical ma=
rks and replaces them with a version of that character with the diacritical=
 mark removed.  For example =C3=A9 becomes e.  However another equally vali=
d way of representing an accented character in Unicode is to have the unacc=
ented character followed by a non-spacing modifier character (like this:  e=
=CC=81  )    The ISOLatin1AccentFilter doesn't handle the accents in decomp=
osed unicode characters at all.    Additionally there are some instances wh=
ere a word will contain what looks like an accented character, that is actu=
ally considered to be a separate unaccented character  such as  =C5=81  but=
 which to make searching easier you want to fold onto the latin1  lookalike=
  version   L  .  =20

The UnicodeNormalizationFilter can filter out accents and diacritical marks=
 whether they occur as composed characters or decomposed characters, it can=
 also handle cases where as described above characters that look like they =
have diacritics (but don't) are to be folded onto the letter that they look=
 like ( =C5=81  -> L )


> A replacement for AsciiFoldingFilter that does a more thorough job of rem=
oving diacritical marks or non-spacing modifiers.
> -------------------------------------------------------------------------=
-------------------------------------------------
>
>                 Key: LUCENE-1343
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1343
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Analysis
>    Affects Versions: 3.1
>            Reporter: Robert Haschart
>            Assignee: Robert Muir
>            Priority: Minor
>             Fix For: 3.1
>
>         Attachments: LUCENE-1343.patch, normalizer.jar, UnicodeCharUtil.j=
ava, UnicodeNormalizationFilter.java, UnicodeNormalizationFilterFactory.jav=
a, utr30.nrm
>
>
> The ISOLatin1AccentFilter takes Unicode characters that have diacritical =
marks and replaces them with a version of that character with the diacritic=
al mark removed.  For example =C3=A9 becomes e.  However another equally va=
lid way of representing an accented character in Unicode is to have the una=
ccented character followed by a non-spacing modifier character (like this: =
 =C3=A9  )    The ISOLatin1AccentFilter doesn't handle the accents in decom=
posed unicode characters at all.    Additionally there are some instances w=
here a word will contain what looks like an accented character, that is act=
ually considered to be a separate unaccented character  such as  =C5=81  bu=
t which to make searching easier you want to fold onto the latin1  lookalik=
e  version   L  .  =20
> The UnicodeNormalizationFilter can filter out accents and diacritical mar=
ks whether they occur as composed characters or decomposed characters, it c=
an also handle cases where as described above characters that look like the=
y have diacritics (but don't) are to be folded onto the letter that they lo=
ok like ( =C5=81  -> L )

--=20
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