docs: def get_objective_requisite_assignment_session(self, proxy):
          """Gets the session for managing objective requisites.
  
          arg:    proxy (osid.proxy.Proxy): a proxy
          return: (osid.learning.ObjectiveRequisiteAssignmentSession) - an
                  ``ObjectiveRequisiteAssignmentSession``
          raise:  NullArgument - ``proxy`` is ``null``
          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 errors.Unimplemented()
          # pylint: disable=no-member
          return sessions.ObjectiveRequisiteAssignmentSession(proxy=proxy, runtime=self._runtime)