With version 1.8.0, xili-language, shipped as other version for tests, now offers automatic ways to add multilingual features for custom post types created by you or developers. Soon, (I hope) a ‘how to set’ post with example of custom post type.
Edit Book (Custom post type)
At the right, you can see the meta boxes to set language of the edited book (here in french by an english writer !) and create linked book in other language if exists.
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