Re: [wsbpel] implicite links of the runtime engine (was: Implicit<sequence> macro)

[Ron Ten-Hove <Ronald.Ten-Hove@Sun.COM>]

Satish Thatte wrote:

>The DAG restriction has to do with the difficulty of providing semantics
>in the presence of cycles.  WSFL already had this restriction.
>
Interesting. Yes, cycles do complicate analysis of process properties, 
but unfortunately a lot of business processes involve cycles that cannot 
be reduced to <while> loops. A lot of ad hoc processes, when mapped to 
an executable form, cannot be reduced to a cycle-free graph. While this 
limits our ability to analyse the properties of such processes, the need 
to automate them still exists.

Should we not allow cycles in process graphs, with some caveats about 
the ability of tools and run-time systems to deal with the complications 
that necessarily arise?

-Ron