docs: def get_repository_lookup_session(self, proxy, *args, **kwargs):
          """Gets the repository lookup session.
  
          arg     proxy (osid.proxy.Proxy): a proxy
          return: (osid.repository.RepositoryLookupSession) - a
                  RepositoryLookupSession
          raise:  OperationFailed - unable to complete request
          raise:  Unimplemented - supports_repository_lookup() is false
          compliance: optional - This method must be implemented if
                      supports_repository_lookup() is true.
  
          """
          if not self.supports_repository_lookup():
              raise Unimplemented()
          try:
              from . import sessions
          except ImportError:
              raise  # OperationFailed()
          proxy = self._convert_proxy(proxy)
          try:
              session = sessions.RepositoryLookupSession(proxy, runtime=self._runtime, **kwargs)
          except AttributeError:
              raise  # OperationFailed()
          return session