Also subworkflows have been used where it would now be natural to use
merging - just because you want to reuse a series of steps from a different
workflow. Merging and Copy/Paste was something we introduced just a few
years ago, so nested workflows from before that could also exist merely as
an artifact, because the user wanted to keep a certain structure from a
different workflow (parts of which might since have been deleted from the
nested workflow). However, in most cases one would believe the reason they
wanted to reuse the fragment is because it is effectively a functional unit.
On 21 November 2013 22:40, Pinar Alper <[email protected]> wrote:
> OK. I think I understand this now.
>
> So sub-workflowing is used as a workflow development construct for
> 1) functional modularisation
> 2) as accessors of data in lists, so as to create combinations not
> possible at depth visible to the immediate processor.
>
>
> thanks again
> pinar
>
> > On 18/11/2013 14:48, Stian Soiland-Reyes wrote:
> >> For instance, if there are iterations over the nested workflow, now
> >> you would have iterations over the immediate first processors instead
> >> (and their downstreams) - which might in some cases require you to
> >> reconfigure List Handling on every step of the workflow.
> >>
> >> Many nested workflows are used with iterations both inside and outside
> >> the nested workflows - in which case there are several List Handling
> >> iteration patterns which can't easily be expressed on a merged
> >> workflow, say outer Dot product and inner Cross product.
> >
> > Another cast that I hit recently relates to the ways in which merges
> > work; if you want to form (apologies for pseudo-SML syntax):
> >
> > 'a list • 'b list • 'c list -> ('a • 'b • 'c) list
> >
> > without using a beanshell, you end up using a merge inside a nested
> > workflow, where the depth of the inputs to the nested workflow are 0 but
> > the values being fed in are lists. Remove the nesting and you get a
> > *completely* different operation which has an outer list which has the
> > three input lists as sub-lists; the outer list is working like a
> > poor-mans tuple. (FWIW, in my particular case, the three values are
> > actually derived from a single input by applications of — decidedly
> > non-trivial — functions, so I can guarantee that doing a dot product
> > works.) Changing the workflow to deal with the fact that the merges now
> > fail would involve introducing an entirely new processor. (I also
> > suspect that we perhaps ought to flag up any workflow that has a merge
> > of a value of depth greater than 0 as being potentially problematic; the
> > “poor-mans tuple†is a categorical canary in the type mine.)
> >
> > I also use nested workflows for looping control and the workflow
> > concerned would *not* work without it. But Stian's already mentioned
> that.
> >
> > The long and short of it is this: nested workflows are a critical
> > feature of Taverna. You can't unnest in all but the most trivial of
> > cases; if you want to understand anything complicated, you'll have to
> > deal with directly nesting. :-)
> >
> > Donal.
> >
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>
>
> --
> regards
> pinar
>
>
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--
Stian Soiland-Reyes, myGrid team
School of Computer Science
The University of Manchester
http://soiland-reyes.com/stian/work/ http://orcid.org/0000-0001-9842-9718
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