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https://issues.apache.org/jira/browse/LUCENE-2454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12866133#action_12866133
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Earwin Burrfoot commented on LUCENE-2454:
-----------------------------------------

An alternate approach - there was a discussion on narrowing indexing API to 
something stream-like, whereas Document becomes its default implementation. We 
can add some flush-boundary signalling methods, or a notion of composite 
documents to that new API.

I like this approach more, as control does not spread out across different 
APIs/instances. You don't have to hold reference to your policy in the indexing 
code, you don't have to raise/lower flags in some remote code to signal things 
that are internal to yours.

> Nested Document query support
> -----------------------------
>
>                 Key: LUCENE-2454
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2454
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Search
>    Affects Versions: 3.0.2
>            Reporter: Mark Harwood
>            Assignee: Mark Harwood
>            Priority: Minor
>         Attachments: LuceneNestedDocumentSupport-1.zip
>
>
> A facility for querying nested documents in a Lucene index as outlined in 
> http://www.slideshare.net/MarkHarwood/proposal-for-nested-document-support-in-lucene

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