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Based on the feedback so far, I updated the document and added some more details from the comments and discussions. 

We still think for-each as a keyword confuses people by setting up some behavior expectations (e.g., it will run sequentially, you can work with data inside the loop, you can ‘nest’ for-each loops - while it’s not a loop at all, just a way to run actions which are not accepting arrays of data, with arrays of data). 

But no better idea on the keyword just yet. 

DZ. 


On Dec 15, 2014, at 10:53 PM, Renat Akhmerov <rakhmerov at mirantis.com> wrote:

> Thanks Nikolay,
> 
> I also left my comments and tend to like Alt2 better than others. Agree with Dmitri that “all-permutations” thing can be just a different construct in the language and “concurrency” should be rather a policy than a property of “for-each” because it doesn’t have any impact on workflow logic itself, it only influence the way how engine runs a task. So again, policies are engine capabilities, not workflow ones.
> 
> One tricky question that’s still in the air is how to deal with publishing. I mean in terms of requirements it’s pretty clear: we need to apply “publish” once after all iterations and be able to access an array of iteration results as $. But technically, it may be a problem to implement such behavior, need to think about it more.
> 
> Renat Akhmerov
> @ Mirantis Inc.
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