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https://issues.apache.org/jira/browse/UIMA-5463?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marshall Schor resolved UIMA-5463.
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Resolution: Fixed
> uv3 add docs: bkwds compatibility: iterator order change
> --------------------------------------------------------
>
> Key: UIMA-5463
> URL: https://issues.apache.org/jira/browse/UIMA-5463
> Project: UIMA
> Issue Type: Improvement
> Components: Core Java Framework
> Reporter: Marshall Schor
> Assignee: Marshall Schor
> Priority: Minor
> Fix For: 3.0.0SDK-beta
>
>
> UIMA defines iterators over an Index as "undefined" for FSs which compare
> equal using the Index's comparator. For example, for Annotations, this is
> based on the begin and end features, and the type via the type priority
> ordering (if one exists).
> UIMA v2 and v3 treat these undefined elements differently, and have different
> iteration orders. For users who may have inadvertantly written code that
> depends on iteration order for "equal" FSs, the results may differ. Document
> this as part of the backward compatibility differences.
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