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https://issues.apache.org/jira/browse/JENA-1488?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16396750#comment-16396750
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Bruno P. Kinoshita commented on JENA-1488:
------------------------------------------

>The DefinedFilter solution sounds like the best from my perspective too.

Agreed! Just re-read [~code-ferret]'s previous comments, then jumped to have a 
look at TextIndexLuceneAssembler/TextIndexLucene. And I believe I'm 
understanding more what he meant. Will wait for his PR to review/test and see 
how the SelectiveFoldingFilter would fit in the solution (I believe I will work 
like a charm!).

>I'd still prefer the SelectiveFoldingFilter to live in the Jena codebase (for 
>reasons of convenience stated above).

Agreed. IIUC, with the DefinedFilter/DefinedTokenizer approach, we will be able 
to use the SelectiveFoldingFilter from my PR, or any other filter/tokenizer 
combination from Lucene :D

 

> SelectiveFoldingFilter for jena-text
> ------------------------------------
>
>                 Key: JENA-1488
>                 URL: https://issues.apache.org/jira/browse/JENA-1488
>             Project: Apache Jena
>          Issue Type: Improvement
>          Components: Text
>    Affects Versions: Jena 3.6.0
>            Reporter: Osma Suominen
>            Assignee: Bruno P. Kinoshita
>            Priority: Major
>
> Currently there's some support for accent folding in jena-text, because 
> Lucene provides an ASCIIFoldingFilter. When this filter is enabled, a search 
> for "deja vu" will match the literal "déjà vu" in the data.
> But we can't use it here at the National Library of Finland (for Finto.fi / 
> Skosmos), because it folds too much! In the Finnish alphabet, in addition to 
> the Latin a-z (which are in ASCII) we use the letters åäö and these should 
> not be folded to ASCII. So we need a Lucene analyzer that can be configured 
> with an exclude list, something like 
>  
> new SelectiveFoldingFilter(String excludeChars) 
>  
> and that can be also be configured via the Jena assembler just like other 
> analyzers supported by jena-text. 
>  
> This was also briefly discussed on the skosmos-users mailing list: 
> [https://groups.google.com/d/msg/skosmos-users/x3zR_uRBQT0/Q90-O_iDAQAJ] 
> Apparently Norwegians have the same problem...
> I've discussed this with [~kinow] and he has some initial code to implement 
> this feature, so I think we can turn this into a PR fairly soon.



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