public void Extract(IExtractedContentHandler contentHandler)
        {
            contentHandler.OnBeginExtraction();

            var rootCatalog = GetRootCatalog();

            ExtractNode(rootCatalog, contentHandler);

            contentHandler.OnFinishExtraction();
        }
 public void OnFinishExtraction()
 {
     OnStatusChanged("Finishing VSF export.");
     _contentHandler.OnFinishExtraction();
 }