The 'Trigger' defines a trigger. A trigger is a kind of 'meta-event'. It is an event that occurs when an event that
was realized at the last event check is now not realized. A trigger is then realized when a given event triggers its
state from 'activated' to 'not activated'. A trigger can be associated with an order through the 'Order' tag.
You can't define a trigger based on another trigger.
The keyword for the 'Trigger' are
