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https://issues.apache.org/jira/browse/SOLR-3535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13294504#comment-13294504
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Jack Krupansky commented on SOLR-3535:
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Maybe there should be a "block-doc-aware" interface/base class that update 
processors can implement or extend. If an update processor does implement that 
interface then it can be passed the new hierarchical doc/list in one shot. But 
for "legacy" update processors (that don't implement "block-doc-aware") each of 
the sub-documents and the parent document would get passed one at a time.

                
> Add block support for XMLLoader
> -------------------------------
>
>                 Key: SOLR-3535
>                 URL: https://issues.apache.org/jira/browse/SOLR-3535
>             Project: Solr
>          Issue Type: Sub-task
>          Components: update
>    Affects Versions: 4.1, 5.0
>            Reporter: Mikhail Khludnev
>            Priority: Minor
>         Attachments: SOLR-3535.patch
>
>
> I'd like to add the following update xml message:
> <add-block>
>     <doc>....</doc>
>     <doc>....</doc>
> </add-block>
> out of scope for now: 
> * other update formats
> * update log support (NRT), should not be a big deal
> * overwrite feature support for block updates - it's more complicated, I'll 
> tell you why
> Alt
> * wdyt about adding attribute to the current tag {pre}<add block="true">{pre} 
> * or we can establish RunBlockUpdateProcessor which treat every <add> 
> ....</add> as a block.
> *Test is included!!*
> How you'd suggest to improve the patch?

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