Add either ``--work-spec`` or ``--work-spec-name`` to an
        :mod:`argparse` `parser`.

def _add_work_spec_name_args(self, parser):
        '''Add either ``--work-spec`` or ``--work-spec-name`` to an
        :mod:`argparse` `parser`.'''
        group = parser.add_mutually_exclusive_group(required=True)
        group.add_argument('-w', '--work-spec', dest='work_spec_path',
                           metavar='FILE', type=existing_path,
                           help='path to a YAML or JSON file')
        group.add_argument('-W', '--work-spec-name', metavar='NAME',
                           help='name of a work spec for queries')