def get_objective_requisite_assignment_session(self):
raise Unimplemented()<EOL>
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``.*