The PRP Library is implemented as a Drupal Book, so each item on the Table of Contents (TOC) is a Book Page. Some modifications have been made in the system to make the language switching work, but most Book operations apply.

The PRP Library has been structured so that each part of the PRP documents, up to level 3, is a separate Book Page, meaning that there is a Book Page for Chapter 1, another for 1.1, and another for 1.1.1, but all depper levels, such as 1.1.1.1 and so on, are included in the body of 1.1.1 and referenced with anchor tags in HTML.

The URL alias of each Book Page should be set to the number of the document section: for example, Chapter 2, section 2.4.2 would have a URL alias of "policy-library/2.4.2", regardless of the language.

Internal links from one part of the PRP to another must follow the format 'href="internal:policy-library/2.4.2"', regardless of the content language. Modifications to the site will ensure that Japanese sections link to Japanese sections, English sections to English sections.

English Book Pages must be created from the English interface, while Japanese translations of these Book Pages must be created from the Japanese interface. When selecting the Book and Parent items in the Node, the language of the options is restricted to the language of the interface, so in order to be able to select the Japanese PRP Book, you must be using the Japanese interface.