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From "Steven Rowe (JIRA)" <>
Subject [jira] Commented: (LUCENE-1166) A tokenfilter to decompose compound words
Date Wed, 06 Feb 2008 16:41:08 GMT


Steven Rowe commented on LUCENE-1166:

Hi Thomas,

Looking at [], which seems to be the
same information as in the file you attached to this issue, the license
issue may be a problem - the hyphenation data is covered by different licenses on a per-language
basis.  For example, there are two German data files, and both are licensed under a LaTeX
license, as is the Danish file, and these two languages are the most likely targets for your
TokenFilter.  IANAL, but unless Apache licenses can be secured for this data, I don't think
the files can be incorporated directly into an Apache project.

Also, I don't see Swedish among the hyphenation data licenses - is it covered in some other

> A tokenfilter to decompose compound words
> -----------------------------------------
>                 Key: LUCENE-1166
>                 URL:
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Analysis
>            Reporter: Thomas Peuss
>         Attachments: CompoundTokenFilter.patch, de.xml, hyphenation.dtd
> A tokenfilter to decompose compound words you find in many germanic languages (like German,
Swedish, ...) into single tokens.
> An example: Donaudampfschiff would be decomposed to Donau, dampf, schiff so that you
can find the word even when you only enter "Schiff".
> I use the hyphenation code from the Apache XML project FOP (
to do the first step of decomposition. Currently I use the FOP jars directly. I only use a
handful of classes from the FOP project.
> My question now:
> Would it be OK to copy this classes over to the Lucene project (renaming the packages
of course) or should I stick with the dependency to the FOP jars? The FOP code uses the ASF
V2 license as well.
> What do you think?

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