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https://issues.apache.org/jira/browse/UIMA-5115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15507891#comment-15507891
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Richard Eckart de Castilho commented on UIMA-5115:
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"between(fs1, fs2)" for me is a shorthand for "coveredBy(fs1.end, fs2.begin)". 
Beyond being a shorthand, I imagine there may be ways of implementing 
"between(fs1, fs2)" more efficiently because we can seek for the fses in the 
index and don't have to go via the offsets. But I may simply now have delved 
sufficiently deep into the APIs yet to see that offsets can be used efficiently 
in the same way.

No, in my present mental world, "between" cannot be used to specify a range for 
"sameBeginEnd" (at). Again, if I wanted to do that I would probably write 
"at(fs1.end, fs2.begin)" and suffer if there are any penalties from 
offset-based lookups vs. FS-based lookups.

> uv3 select() api for iterators and streams over CAS contents
> ------------------------------------------------------------
>
>                 Key: UIMA-5115
>                 URL: https://issues.apache.org/jira/browse/UIMA-5115
>             Project: UIMA
>          Issue Type: New Feature
>          Components: Core Java Framework
>            Reporter: Marshall Schor
>            Priority: Minor
>             Fix For: 3.0.0SDKexp
>
>
> Design and implement a select() API based on uimaFIT's select, integrated 
> well with Java 8 concepts.  Initial discussions in UIMA-1524.  Wiki with 
> diagram: https://cwiki.apache.org/confluence/display/UIMA/UV3+Iterator+support



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