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https://issues.apache.org/jira/browse/LUCENE-1343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12786941#action_12786941
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DM Smith commented on LUCENE-1343:
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I also am dubious about a general purpose folding filter that maps letters to
their ASCII look-alike and agree that folding is language dependent.
May Americans are illiterate when it comes to text with diacritics and NSM.
Personally I'm nearly illiterate. I think having prominent folding filters
without adequate explanation about their pitfalls or usefulness may lead
illiterates into a false sense of sufficiency.
If it makes sense to have a filter for TR39 I think that should be a separate
issue. If that's what this issue is all about then it's description should be
modified.
I think this should otherwise be closed as a bad idea.
Robert Muir, Would it make sense to have a Greek filter that strips diacritics?
My thought is that if the letter is Greek then the diacritics would be removed,
but otherwise it would not.
Similar question for Hebrew, I see value in two filters: one would strip
cantillation and the other, vowel points. Or would it be better to have one
that can do both depending on flags?
> A replacement for ISOLatin1AccentFilter that does a more thorough job of
> removing 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
> Reporter: Robert Haschart
> Priority: Minor
> Attachments: normalizer.jar, UnicodeCharUtil.java,
> UnicodeNormalizationFilter.java, UnicodeNormalizationFilterFactory.java
>
>
> The ISOLatin1AccentFilter takes Unicode characters that have diacritical
> marks and replaces them with a version of that character with the diacritical
> mark removed. For example é becomes e. However another equally valid way of
> representing an accented character in Unicode is to have the unaccented
> character followed by a non-spacing modifier character (like this: é )
> The ISOLatin1AccentFilter doesn't handle the accents in decomposed unicode
> characters at all. Additionally there are some instances where a word will
> contain what looks like an accented character, that is actually considered to
> be a separate unaccented character such as Ł but which to make searching
> easier you want to fold onto the latin1 lookalike version L .
> 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 ( Ł -> L )
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