code: def sign(self, xml_doc):
          
          try:
              self.client = Client(self.url)
          except ValueError as e:
              self.message = e.message
          except URLError:
              self.message = 'The url you provided: ' + \
                  '%s could not be reached' % self.url
docs: Sign the document with a third party signatory.
  
          :param str xml_doc: Document self signed in plain xml
          :returns answer: Answer is given from the signatory
              itself if connected.