code: public B escalation(String escalationCode) {
      EscalationEventDefinition escalationEventDefinition = createEscalationEventDefinition(escalationCode);
      element.getEventDefinitions().add(escalationEventDefinition);
  
      return myself;
    }
docs: Sets an escalation definition for the given escalation code. If already an escalation
  with this code exists it will be used, otherwise a new escalation is created.
  
  @param escalationCode the code of the escalation
  @return the builder object