The Compendium represents the repository from which all the material in the book will draw. While not everything that appears in the Compendiaum will appear in the book of vice-versa, the idea of the Compendium is to act as a collector for information that may appear in the book. Likely, the compendium will likely be a bit rougher and suffer through various levels of editing. In general, the Compendium is meant to larger and more comprehensivve to the book