[jira] [Created] (UIMA-5463) uv3 add docs: bkwds compatibility: iterator order change

["Marshall Schor (JIRA)" <de...@uima.apache.org>]

Marshall Schor created UIMA-5463:
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             Summary: 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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