An EventType that classifies an Action to be executed. For example, reaching a destination is a task that can be executed by performing certain actions, e.g. driving a car, buying a train ticket, etc. The actions to execute a task can also be organized according to a Plan that is not the same as the one that defines the task (if any). For example, reaching a destination could be defined by a plan to get on holidays, while the plan to execute the task can consist of putting some travels into a sequence.