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https://issues.apache.org/jira/browse/OPENJPA-1744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13014225#comment-13014225
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Michael Dick commented on OPENJPA-1744:
---------------------------------------

Most of the nonrelational support is still in place - a rudimentary xml store 
was part of the initial code drop and is (afaik) still usable.

Implementing a different spec on top of the OpenJPA kernel would be a 
significant undertaking. Is there anything specific to JDO that makes it more 
(or less) usable with non relational stores? I'm looking for pros and cons of 
adding JDO over implementing a hadoop / big table store that uses JPA 
interfaces? 

> Support JDO
> -----------
>
>                 Key: OPENJPA-1744
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1744
>             Project: OpenJPA
>          Issue Type: Improvement
>            Reporter: Matthew T. Adams
>
> OpenJPA came from Kodo, which was a JDO implementation at the time the code 
> was forked.  This request is to bring compliance with the latest JDO 
> specification back to the implementation so that it can be used with 
> nonrelational backends like Google BigTable, Hadoop, etc.

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