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From "Shai Erera (JIRA)" <>
Subject [jira] Commented: (LUCENE-2498) add sentence boundary charfilter
Date Sun, 13 Jun 2010 06:23:13 GMT


Shai Erera commented on LUCENE-2498:

FWIW, I've implemented sentence boundary support by returning a special token (Type.EOF) from
the Tokenizer and created a EOSFilter which increments the posIncr attribute (set it to 100).
I haven't been following UAX#29 issue, but I'm sure it's a great thing :).

I've used the following to detect
EOS + \u0085 (Next Line (NEL). I'm sure though that there are other markers as well.

> add sentence boundary charfilter
> --------------------------------
>                 Key: LUCENE-2498
>                 URL:
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: contrib/analyzers
>            Reporter: Robert Muir
> From the discussion of LUCENE-2167:
> It would be nice to have a CharFilter? to mark sentence boundaries.
> Such functionality would be useful for:
> * prevent phrase queries with 0 slop from matching across sentences
> * inhibiting multiword synonyms, or shingles, etc.
> For sentence boundary detection we could use Jflex's support for the Unicode Sentence_Break
property etc,
> and the UAX#29 definition as a default grammar.
> One idea is to just mark the boundaries with a user-provided String.
> As a simple use-case, a user could then add this string to a stopfilter, and it would
introduce a position increment.
> This would inhibit phrase queries, etc.
> a user could use the sentence-markers to do more advanced processing downstream.

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