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

            var rootCatalog = GetRootCatalog();

            ExtractNode(rootCatalog, contentHandler);

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