Marco Roos wrote:
> Dear Taverna 2 user/developer,
>
> I have attached a little workflow that produces an empty lists in three
> ways: an empty list in the middle of a list of lists, a single (empty)
> list, and an empty list at the end of a list. The output of this
> workflow in the results perspective is as follows.
>
> Empty list in the middle is shown as 'waiting for data'.
> Empty list: nothing
> Empty list at end: nothing (after the list that has items).
>
> The list sizes suggest that internally empty lists are never lost and I
> assume remain a genuine part of a list. This seems very properly done to
> me, but couldn't the output of the worklow reflect this in the results
> perspective? The apparent discrepancy is a bit confusing for me now.
Just to check I ran this workflow from the platform, the empty lists are
part of the results so this *is* a display bug. Printout from a console
workflow listener below:
---
Token 'Token(facade0)[]{t2:list//testNamespace?test0/false/1}' produced
on 'emptylist'
t2:list//testNamespace?test0/false/1
Token 'Token(facade0)[]{t2:list//testNamespace?test12/false/2}' produced
on 'emptyatend'
t2:list//testNamespace?test12/false/2
t2:list//testNamespace?test7/false/1
t2:ref//testNamespace?test2
external : string{item1}
t2:ref//testNamespace?test4
external : string{item2}
t2:ref//testNamespace?test5
external : string{item3}
t2:list//testNamespace?test10/false/1
Token 'Token(facade0)[]{t2:list//testNamespace?test14/false/2}' produced
on 'emptyinmiddle'
t2:list//testNamespace?test14/false/2
t2:list//testNamespace?test8/false/1
t2:ref//testNamespace?test1
external : string{item1}
t2:ref//testNamespace?test6
external : string{item2}
t2:list//testNamespace?test9/false/1
t2:list//testNamespace?test13/false/1
t2:ref//testNamespace?test11
external : string{item3}
---
This shows the workflow engine is correctly producing and returning the
empty lists.
Tom
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