docs: private void writeObject (final ObjectOutputStream aOS) throws IOException
    {
      // Read the data
      if (m_aDFOS.isInMemory ())
      {
        _ensureCachedContentIsPresent ();
      }
      else
      {
        m_aCachedContent = null;
        m_aDFOSFile = m_aDFOS.getFile ();
      }
  
      // write out values
      aOS.defaultWriteObject ();
    }