- A book is a high level data structure. A book is subdivided into Chapters and subChapters to an infinite nesting level. (Sub)Chapters in turn contain Articles.
- A Book is divided into several chapters and subchapters to an infinite nesting level. Synonym for Section.
- Synonym for Post or Item.
- An Online Manual is a collection of ManualPages? (same as Posts?) organized into a hierarchy Chapters? and sub-chapters, generally with specific ordering.