docs: def get_objective_requisite_assignment_session(self, *args, **kwargs):
          """Gets the session for managing objective requisites.
  
          return: (osid.learning.ObjectiveRequisiteAssignmentSession) - an
                  ObjectiveRequisiteAssignmentSession
          raise:  OperationFailed - unable to complete request
          raise:  Unimplemented -
                  supports_objective_requisite_assignment() is false
          compliance: optional - This method must be implemented if
                      supports_objective_requisite_assignment() is true.
  
          """
          if not self.supports_objective_requisite_assignment():
              raise Unimplemented()
          try:
              from . import sessions
          except ImportError:
              raise OperationFailed()
          try:
              session = sessions.ObjectiveRequisiteAssignmentSession(runtime=self._runtime)
          except AttributeError:
              raise OperationFailed()
          return session