That's a good point about multiple languages executing on th same engine.  Of 
course, once a CIO starts thinking of something as a 'BPM" solution, it's not 
always easy to convince them that we should be using two different process 
definition languages instead of just one.
anonymous wrote : XML schema types, WSDL definitions and structured constructs 
aren't in the vocabulary of business analysts.Indeed, with BPEL a developer 
would have to provide partner services (dealing with all the WSDL stuff, etc.) 
for use in the parent process by the analyst; and actually, the analyst would 
still need to become a bit more "technical".   

It might also be difficult to rule out any need for a simple user interaction 
or two in the parent process--at which point it becomes difficult for BPEL to 
make the grade.  With BPEL as the parent process definition lanquage, all human 
tasks would need to be relagated to a sub-process (of some sort), even the 
simplest ones.  Oracle's BPEL product exemplifies this by supplying a pre-built 
web service that handles human tasks.



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