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https://issues.apache.org/jira/browse/UIMA-125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12463581
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Thilo Goetz commented on UIMA-125:
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I thought there was an issue with XCAS 1.x/2.0 interoperability because the 
Sofa datastructure in the CAS had changed.  I remember trying to load 1.x 
XCASes for test cases, and that wouldn't work.  Do we have code that takes care 
of that at the services level?  If so, can I use that code to make, for 
example, CVD XCAS version agnostic?

> Apache UIMA client should be able to communicate with IBM UIMA (1.x or 2.0) 
> service
> -----------------------------------------------------------------------------------
>
>                 Key: UIMA-125
>                 URL: https://issues.apache.org/jira/browse/UIMA-125
>             Project: UIMA
>          Issue Type: Improvement
>          Components: Transport Adapters - SOAP, Vinci
>            Reporter: Adam Lally
>         Assigned To: Eddie Epstein
>             Fix For: 2.1
>
>
> For ease of migration it is important that an application running Apache UIMA 
> should be able to call services deployed under previous versions of UIMA.
> Previous discussions with Eddie have indicated this would be fairly 
> straightforward for single-Sofa CASes, not necessarily for CASes containing 
> multiple Sofas.  Possibly support for single-Sofa CASes only is sufficient, 
> as that would still help migration for the vast majority of UIMA users.

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