Hello,
I had planned to integrate Sebastian Bergmann workflow engine in Joomla, which I did, but then we figured out that it will be better to rewrite a new one.
After some researches, I concluded that Petri Nets are the best representations for the core of a new workflow engine.
So, I implemented a Petri Net API (framework) and its description is availaible on the repo :
https://github.com/florianv/PetrinetI'm waiting for your feedback.
Regards,
Florian