code: @Override
    public void eUnset(int featureID)
    {
      switch (featureID)
      {
        case SimpleAntlrPackage.OPTION_VALUE__KEY:
          setKey(KEY_EDEFAULT);
          return;
        case SimpleAntlrPackage.OPTION_VALUE__VALUE:
          setValue(VALUE_EDEFAULT);
          return;
      }
      super.eUnset(featureID);
    }
docs: <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated