Reorganization of EPUB Specifications

[mattgarrish]

A number of changes are being made in EPUB 3.1 to simplify the readability of the specifications, key among these are:

• A new top-level specification called simply "EPUB 3.1" is being added. This document will contain a list of all core specifications in the standard, the high-level publication requirements, publication resource requirements, as well as an index of features. This specification will become the official reference point for EPUB.
• The "EPUB Publications" specification is being renamed to "EPUB Packages" as the publication requirements are moving to the top-level specification (the name is a return to the Open Packaging Format naming prior to EPUB 3). All requirements for packages will be retained in this document, as the specification will focus solely on what is required for any rendition of the content. The EPUB Navigation Document definition will move to this specification as it is an implementation of a content document to provide navigation for a package (i.e., it does not add requirements for how to produce content documents, and was out of place in Content Documents itself).
• Content Documents loses the navigation document definition, but otherwise is undergoing only some small shuffling of content to simplify readability.
• OCF includes some minor changes for readability but is functionally unchanged by this process.

This issue will remain open past the publication of the first draft for comments.