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https://issues.apache.org/jira/browse/UIMA-1257?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on UIMA-1257 started by Adam Lally.

> Type System Merging Should Produce Consistent Ordering of Types
> ---------------------------------------------------------------
>
>                 Key: UIMA-1257
>                 URL: https://issues.apache.org/jira/browse/UIMA-1257
>             Project: UIMA
>          Issue Type: Improvement
>          Components: Core Java Framework
>    Affects Versions: 2.2.2
>            Reporter: Adam Lally
>            Assignee: Adam Lally
>            Priority: Minor
>             Fix For: 2.3
>
>
> Currently when type systems are merged across annotators, the ordering of the 
> types produced by the merge method is not defined, and varies according to 
> the ordering in which the individual type system descriptors are passed to 
> the merge method.  The ordering depends on the order in which individual AEs 
> are initialized, which is also not defined, and may even vary according to 
> JVM version.
> One reason to improve this is that UIMA-AS has a feature to allow binary 
> serialization, but it requires that type systems be identical on both sides 
> of the connection, and it is difficult to ensure this if ordering cannot be 
> relied on. 

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