def get_objective_search_session_for_objective_bank(self, objective_bank_id=None):
if objective_bank_id is None:<EOL><INDENT>raise NullArgument<EOL><DEDENT>raise Unimplemented()<EOL>
Gets the ``OsidSession`` associated with the objective search service for the given objective bank.

        arg:    objective_bank_id (osid.id.Id): the ``Id`` of the
                objective bank
        return: (osid.learning.ObjectiveSearchSession) - ``an
                _objective_search_session``
        raise:  NotFound - ``objective_bank_id`` not found
        raise:  NullArgument - ``objective_bank_id`` is ``null``
        raise:  OperationFailed - ``unable to complete request``
        raise:  Unimplemented - ``supports_objective_search()`` or
                ``supports_visible_federation()`` is ``false``
        *compliance: optional -- This method must be implemented if
        ``supports_objective_search()`` and
        ``supports_visible_federation()`` are ``true``.*