docs: @Override
    public void eUnset(int featureID)
    {
      switch (featureID)
      {
        case SimpleExpressionsPackage.IF_CONDITION__ELSEIF:
          setElseif(ELSEIF_EDEFAULT);
          return;
        case SimpleExpressionsPackage.IF_CONDITION__CONDITION:
          setCondition((Expression)null);
          return;
      }
      super.eUnset(featureID);
    }