Hi everyone, my name is Pablo, I work with Antoine's team at Intalio and I have some document on google docs that I would like to share with you. It's a sequence diagram I created when I was trying to understand how jBPM works. It only shows a test case's sequence and it's already old, but still it might help someone in the same situation in the future. I hope it is of use for someone.
https://docs2.google.com/a/intalio.com/drawings/d/1f9B8lVsbpiMytfgAjjAsV8L4rTAmdrD_YwhS3fATwfA/edit?hl=en&authkey=CJy7zr0M

Regards.

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Pablo Elo.
Developer at Intalio Argentina.