code: def create(cls, name, ipv4_network=None, ipv6_network=None,
                 comment=None):
          
          ipv4_network = ipv4_network if ipv4_network else None
          ipv6_network = ipv6_network if ipv6_network else None
          json = {'name': name,
                  'ipv4_network': ipv4_network,
                  'ipv6_network': ipv6_network,
                  'comment': comment}
  
          return ElementCreator(cls, json)
docs: Create the network element
  
          :param str name: Name of element
          :param str ipv4_network: network cidr (optional if ipv6)
          :param str ipv6_network: network cidr (optional if ipv4)
          :param str comment: comment (optional)
          :raises CreateElementFailed: element creation failed with reason
          :return: instance with meta
          :rtype: Network
          
          .. note:: Either an ipv4_network or ipv6_network must be specified