'Add any book-writing options to the :class:`Config` object
:param:`cfg`.'

@classmethod
def config(cls, cfg):

    oeb = cfg.add_group('oeb', _('OPF/NCX/etc.    generation    options.'))
    versions = ['1.2', '2.0']
    oeb('opf_version', ['--opf-version'], default='2.0', choices=versions, help=_('OPF    version    to    generate.    Default    is    %default.'))
    oeb('adobe_page_map', ['--adobe-page-map'], default=False, help=_('Generate    an    Adobe    "page-map"    file    if    pagination    information    is    available.'))
    return cfg
