6.3. Document specific information
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## 6.3. Document specific information

This section contains specific notes about particular documents managed by the FDP.

### 6.3.1. The Handbook

#### `books/handbook/`

The Handbook is written to comply with the FreeBSD DocBook extended DTD.

The Handbook is organized as a DocBook `book`. It is then divided into `part`s, each of which may contain several `chapter`s. `chapter`s are further subdivided into sections (`sect1`) and subsections (`sect2`, `sect3`) and so on.

#### 6.3.1.1. Physical organization

There are a number of files and directories within the `handbook` directory.

### 注意:

The Handbook's organization may change over time, and this document may lag in detailing the organizational changes. If you have any questions about how the Handbook is organized, please contact the FreeBSD documentation project 郵遞論壇.

##### 6.3.1.1.1. `Makefile`

The `Makefile` defines some variables that affect how the SGML source is converted to other formats, and lists the various source files that make up the Handbook. It then includes the standard `doc.project.mk` file, to bring in the rest of the code that handles converting documents from one format to another.

##### 6.3.1.1.2. `book.xml`

This is the top level document in the Handbook. It contains the Handbook's DOCTYPE declaration, as well as the elements that describe the Handbook's structure.

`book.xml` uses parameter entities to load in the files with the `.ent` extension. These files (described later) then define general entities that are used throughout the rest of the Handbook.

##### 6.3.1.1.3. ``directory`/chapter.xml`

Each chapter in the Handbook is stored in a file called `chapter.xml` in a separate directory from the other chapters. Each directory is named after the value of the `id` attribute on the `chapter` element.

For example, if one of the chapter files contains:

<chapter id="kernelconfiguration"> ... </chapter>

then it will be called `chapter.xml` in the `kernelconfiguration` directory. In general, the entire contents of the chapter will be held in this file.

When the HTML version of the Handbook is produced, this will yield `kernelconfiguration.html`. This is because of the `id` value, and is not related to the name of the directory.

In earlier versions of the Handbook the files were stored in the same directory as `book.xml`, and named after the value of the `id` attribute on the file's `chapter` element. Moving them into separate directories prepares for future plans for the Handbook. Specifically, it will soon be possible to include images in each chapter. It makes more sense for each image to be stored in a directory with the text for the chapter than to try to keep the text for all the chapters, and all the images, in one large directory. Namespace collisions would be inevitable, and it is easier to work with several directories with a few files in them than it is to work with one directory that has many files in it.

A brief look will show that there are many directories with individual `chapter.xml` files, including `basics/chapter.xml`, `introduction/chapter.xml`, and `printing/chapter.xml`.

### 重要:

Chapters and/or directories should not be named in a fashion that reflects their ordering within the Handbook. This ordering might change as the content within the Handbook is reorganized; this sort of reorganization should not (generally) include the need to rename files (unless entire chapters are being promoted or demoted within the hierarchy).

Each `chapter.xml` file will not be a complete SGML document. In particular, they will not have their own DOCTYPE lines at the start of the files.

This is unfortunate as it makes it impossible to treat these as generic SGML files and simply convert them to HTML, RTF, PS, and other formats in the same way the main Handbook is generated. This would force you to rebuild the Handbook every time you want to see the effect a change has had on just one chapter.

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