-The Petri net is specified by implementing a set of callback functions (much like the `gen_fsm` behavior) declaring the place names, the transition names, the preset for each transition, in what modes a transition is enabled, what happens, when a transition fires in a given mode, and the net's initial marking. To communicate with the outside world, callback functions handling calls, casts, and unformatted messages can be provided. Finally, the user can specify a trigger function that is called for each token that is about to emerge on a place. This trigger function can devise side effects and can either let the token be created normally or make it vanish. Both terminating and live nets can be defined using `gen_pnet` and even though a live net never finishes to make progress, the net instance is constantly responsive to outside requests.
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