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I<transition> or I<task>.

=item * C<$action>

The event action called on the entity. This is either I<start>, I<continue>,
I<complete> or I<execute>.

=item * C<$node>

The first argument passed to the C<cb_*> callback method, the respective entity
node in the process that this callback is emitted for. On activity callbacks,
this is the activity object, the task object on task callbacks, the process
object for process entities, and transition for transition calls.

=item * C<$instance>

The second argument passed to the C<cb_*> callback method, being the instance
for the node called on. In case of a transition callback, this is the activity
instance the transition originated from (the activity being executed).

=back