Re: A bunch of OWL-S difficulties

Daniel Elenius wrote:

> 
> Hi.
> 
> Here is a whole bunch of issues/questions/comments on OWL-S that I wish 
> to discuss. Please dig in on any of them that you like. (The comments 
> below refer to OWL-S 1.1 beta.)
> 
> .... stuff omitted
> 
> 5) Split+Join vs Unordered
> What is the difference between these two control constructs? Can I get 
> an example to show the difference?

 From the technical overview, it appears to me that there's only one 
difference: split+join indicates *concurrent* execution of a group of 
activities, whereas unordered is non-committal on that point.  That is, 
unordered is "looser", in that it could allow for either a sequential or 
a concurrent execution (or perhaps some arbitrary combination of the 2 
approaches).  (Thus, informally, one could think of the set of unordered 
executions as a superset of the set of split+join executions.)

As to how often anyone would care about this distinction, or if it 
should be retained, that's a separate matter I guess.  Comments are 
welcome on this question.

Regards,
David