# setSpec = map(self.tag_to_setspec, book.tags.filter(category__in=self.TAG_CATEGORIES))
header = common.Header(None, identifier, make_time_naive(book.changed_at), [], False)
if not headers_only:
# setSpec = map(self.tag_to_setspec, book.tags.filter(category__in=self.TAG_CATEGORIES))
header = common.Header(None, identifier, make_time_naive(book.changed_at), [], False)
if not headers_only: