code: @Override
    public void eUnset(int featureID)
    {
      switch (featureID)
      {
        case PureXbasePackage.MODEL__IMPORT_SECTION:
          setImportSection((XImportSection)null);
          return;
        case PureXbasePackage.MODEL__BLOCK:
          setBlock((XBlockExpression)null);
          return;
      }
      super.eUnset(featureID);
    }
docs: <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated