yadis.manager.YadisServiceManager:
Holds the state of a list of selected Yadis services, managing
storing it in a session and iterating over the services in
order.
yadis.filters.BasicServiceEndpoint:
Generic endpoint object that contains parsed service
information, as well as a reference to the service element from
which it was generated.
unittest.TestCase:
A class whose instances are single test cases.