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https://issues.apache.org/jira/browse/LUCENE-2358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12851652#action_12851652
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Steven Rowe commented on LUCENE-2358:
-------------------------------------

Hi Robert,

I'm working on a change to ShingleFilter to not output "_" filler token 
unigrams (or generally, filler-only ngrams, to cover the case where position 
increment gaps exceed n).  

I needed to be able to mark cached tokens as being filler tokens (or not) - a 
boolean attribute.  After trying to write a new private-use attribute and 
failing (I didn't make both an interface and an implementation, I think - I 
should figure it out and improve the docs I guess), I found KeywordAttribute 
and have used it to mark whether or not a cached token is a filler token 
(keyword:yes => filler-token:yes).

Would it make sense to have a generalized boolean attribute, specialized for 
keywords or (fill-in-the-blank)?  It's a small leap to say that "iskeyword" 
means true for whatever boolean attribute you want to carry, so this isn't 
really a big deal, but I thought I'd bring it up while you're thinking about 
naming this thing.

(This may be a can of worms: if there  is a generic boolean attribute, should 
there be generic string/int/float/etc. attributes too?)

Steve


> rename KeywordMarkerTokenFilter
> -------------------------------
>
>                 Key: LUCENE-2358
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2358
>             Project: Lucene - Java
>          Issue Type: Task
>          Components: Analysis
>            Reporter: Robert Muir
>            Priority: Trivial
>         Attachments: LUCENE-2358.patch
>
>
> I would like to rename KeywordMarkerTokenFilter to KeywordMarkerFilter.
> We havent released it yet, so its a good time to keep the name brief and 
> consistent.

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