code: @Override
    public boolean eIsSet(int featureID)
    {
      switch (featureID)
      {
        case SimpleAntlrPackage.OPTION_VALUE__KEY:
          return KEY_EDEFAULT == null ? key != null : !KEY_EDEFAULT.equals(key);
        case SimpleAntlrPackage.OPTION_VALUE__VALUE:
          return VALUE_EDEFAULT == null ? value != null : !VALUE_EDEFAULT.equals(value);
      }
      return super.eIsSet(featureID);
    }
docs: <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated