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https://issues.apache.org/jira/browse/UIMA-6407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17470434#comment-17470434
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Peter Klügl commented on UIMA-6407:
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You are correct. GATHER is irrelevant since the introduction of labels.
Before labels have been available, there was a need to have some action to
create complex annotations where the features are set to specific matches of
other rule elements. Thus the GATHER action was introduced. I would call it
deprecated now and would not recommend using it. It is still there for
backwards compatibility.
(The same applies for other language elements like SHIFT)
> Ruta: Relevance/Purpose of GATHER
> ---------------------------------
>
> Key: UIMA-6407
> URL: https://issues.apache.org/jira/browse/UIMA-6407
> Project: UIMA
> Issue Type: Question
> Components: Ruta
> Affects Versions: 2.8.1ruta, 3.1.0ruta
> Reporter: Michael Stenger
> Assignee: Peter Klügl
> Priority: Minor
>
> Hi.
> This is just a question for clarification on the functionality of action
> GATHER. As far as I can tell, it creates a new annotation of the given type,
> spanning the matched annotation of the given rule elements and allows to
> assign them to the features of the created annotation.
> But how is this different from the CREATE action? I'd argue that the latter
> can do the same and more, which would render GATHER irrelevant. Just by using
> LabelExpressions instead of NumberExpressions as arguments:
> {noformat}
> A B{-> GATHER(C, 1, 2, "a" = 1, "b" = 2)};
> // VS
> x:A y:B{-> CREATE(C, 1, 2, "a" = x, "b" = y)};{noformat}
> Some clarification would be great. Thank you.
> Best, Michael
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