I have been working on migrating web sites from atleast Drupal 6 to WordPress 3.7 and at one content type I got little stuck until I found your great plugin to WordPress which enables me to get book-like content.
To accomplish importing Drupal books I have to identify also how the databas logic/relationships works for Organize Series.
So far I have identified Three tables you are using which is terms, term_taxonomy and term_relationships.
To what I understand I have this so far:
term_id = unique id for each series
name = The name of the series
slug = shortname for the book
term_group = doesn't needed so I set it to 0
term_taxonomy_id = unique id
term_id = pointer to the table terms and the field term_id
taxonomy = series
description = description of the series, not necessary what I know
parent = this is not necessary to what I know so I set it to 0
count = I do not know how important this is, so far I set it to 0
object_id = pointer to the table posts and the field nid
term_taxonomy_id = pointer to the table term_taxonomy and the field term_taxonomy_id
term_order = not necessary so I set it to 0
Now I end up with some problems:
1. It only shows one post/node in each series
2. Can not open any node/post in each series without error 404, I can fix that manually in each post to change URL but it would be nice if this plugin could use the default defined URLs by WordPress permalinks instead and not putting the posts directly under /series/slug or allow me to change URL with SQL script when I migrate to WordPress so the old books posts works with this plugin.
3. I know this plugin do not support multiple series in one master serie with GUI but it shall be possible through code? I do not break any things with considering of future updates of your plugin.
Hope I was describing well enough :) Thanks in advance.