Richard Eckart de Castilho commented on UIMA-5115:

I think `at(location).single()` is quite a different thing. at (between, 
covered by, etc.) is IMHO all referring to a "location constraint" whereas 
single is a cardinality constraint. The following variations should all IMHO be 

jcas.select(Token.class).coveredBy(10, 20).singleOrNull()
jcas.select(Token.class).between(firstName, lastName).get()

or abstractly


> 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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