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https://issues.apache.org/jira/browse/LUCENE-2628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12903990#action_12903990
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Robert Muir commented on LUCENE-2628:
-------------------------------------

{quote}
I actually don't agree on that, if a nice stand alone jar comes out of what we 
do here we should not hesitate to make it usable without the core but that 
might be a super rare case and might even have never happened before here but 
generally being against such a thing doesn't seem to be community or cross 
project friendly to me.
{quote}

I'm sorry, I strongly disagree. I dont think we should publish artifacts such 
as "utility jars" that are not directly related to search.

Furthermore, I do think more things should be marked lucene.internal. In any 
other good size software project, there is a mechanism beyond java 
'public/protected/private' keywords so that
# the code can be shared across packages for internal use
# the code is still not 'exposed' and supported as a public API.

In the JDK, this stuff might be under the package sun.*, in other projects, i 
have seen ".impl" packages.

The only mechanism we have to keep things reasonable from a support 
(back-compat, etc) standpoint is to mark things lucene.internal, and we should 
use it, or we prevent changes/progress by creating an unreasonable support 
burden. 


> Extract OpenBitSet to Apache Commons
> ------------------------------------
>
>                 Key: LUCENE-2628
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2628
>             Project: Lucene - Java
>          Issue Type: Wish
>            Reporter: Stu Hood
>
> o.a.l.util.OpenBitSet is a great alternative to java.util.BitSet, and it is 
> generally useful outside of the search field. It would be great if OpenBitSet 
> were available outside of Lucene proper, perhaps as part of Apache Commons.
> Aside from the communication required to accomplish this, there is the small 
> issue of OpenBitSet extending o.a.l.search.DocIdSet in Lucene 3.0. There is 
> very little logic contained in DocIdSet, so it could probably become an 
> interface: Lucene proper could then extend the extract version of OpenBitSet 
> to implement DocIdSet.

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