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Subject: [wsbpel-comment] Why is <link> acyclic?


Just a few (inoffical) ideas/answers:

In BPEL a link is not a control flow (like a goto) it is more a signalling relationship. Those cant be cyclic, because they are only activated once.

You will have to map a cyclic BPMN to a loop construct in BPEL. Another option is to not allow them in your designer, because that may lead to all kind of confusions. In BPMN you can make a scope repeatable, thats better than modelling "goto loops". (we do that in our process designer also this way).


-----Original Message-----
From: John Evdemon [mailto:John.Evdemon@microsoft.com] 
Sent: Wednesday, September 06, 2006 7:39 PM
To: wsbpel@lists.oasis-open.org
Subject: [wsbpel] FW: [wsbpel-comment] Why is <link> acyclic?

Hello all,

The message below appeared on the BPEL Comments list earlier this week.

Does anyone want to volunteer to answer?


> -----Original Message-----
> From: João Luís Silva Assunção [mailto:jassuncao@deetc.isel.ipl.pt]
> Sent: Monday, September 04, 2006 2:51 PM
> To: wsbpel-comment@lists.oasis-open.org
> Subject: [wsbpel-comment] Why is <link> acyclic?
> Hello all,
> First of all,my apologies if the question is as a dumb one or in the 
> wrong place.
> I'm developing a BPMN designer that exports to BPEL as a school 
> project. Due to the cyclic nature of BPMN diagrams and the acyclic 
> nature of BPEL I had a lot of work to implement the mapping between 
> the two, and I noticed it could be a lot simpler if <link> was not 
> acyclic. What is the reason behind this restriction?
> Thank you.
> This publicly archived list offers a means to provide input to the 
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