(cons 'page:is-last-bookpart is-last-bookpart)
(cons 'page:is-bookpart-last-page is-bookpart-last-page)
(cons 'page:page-number-string
(cons 'page:is-last-bookpart is-last-bookpart)
(cons 'page:is-bookpart-last-page is-bookpart-last-page)
(cons 'page:page-number-string