code: def add_site_element(self, element):
          
          element = element_resolver(element)
          self.data['site_element'].extend(element)
          self.update()
docs: Add a site element or list of elements to this VPN.
  
          :param list element: list of Elements or href's of vpn site
              elements
          :type element: list(str,Network)
          :raises UpdateElementFailed: fails due to reason
          :return: None