docs: def get_objective_sequencing_session_for_objective_bank(self, objective_bank_id, proxy):
          """Gets the ``OsidSession`` associated with the objective sequencing service for the given objective bank.
  
          :param objective_bank_id: the ``Id`` of the objective bank
          :type objective_bank_id: ``osid.id.Id``
          :param proxy: a proxy
          :type proxy: ``osid.proxy.Proxy``
          :return: an ``ObjectiveSequencingSession``
          :rtype: ``osid.learning.ObjectiveSequencingSession``
          :raise: ``NotFound`` -- ``objective_bank_id`` not found
          :raise: ``NullArgument`` -- ``objective_bank_id`` or ``proxy`` is ``null``
          :raise: ``OperationFailed`` -- ``unable to complete request``
          :raise: ``Unimplemented`` -- ``supports_objective_sequencing()`` or ``supports_visible_federation()`` is ``false``
  
          *compliance: optional -- This method must be implemented if ``supports_objective_sequencing()`` and ``supports_visible_federation()`` are ``true``.*
  
          """
          if not objective_bank_id:
              raise NullArgument
          if not self.supports_objective_sequencing():
              raise Unimplemented()
          try:
              from . import sessions
          except ImportError:
              raise OperationFailed()
          proxy = self._convert_proxy(proxy)
          try:
              session = sessions.ObjectiveSequencingSession(objective_bank_id=objective_bank_id, proxy=proxy, runtime=self._runtime)
          except AttributeError:
              raise OperationFailed()
          return session