code: def download_url(self, url, **kwargs):
          
          if self.baseurl and '://' not in url:
              url = join(self.baseurl, url)
          return self.resolver.download_to_directory(self.directory, url, **kwargs)
docs: Download a URL to the workspace.
  
          Args:
              url (string): URL to download to directory
              **kwargs : See :py:mod:`ocrd.resolver.Resolver`
  
          Returns:
              The local filename of the downloaded file