docs: @Override
  	public void setArgument(XExpression newArgument)
  	{
  		XExpression oldArgument = argument;
  		argument = newArgument;
  		if (eNotificationRequired())
  			eNotify(new ENotificationImpl(this, Notification.SET, SarlPackage.SARL_CASTED_EXPRESSION__ARGUMENT, oldArgument, argument));
  	}