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Every document must begin with a Document Info section, which looks something like this:
[article The Document Title
    [quickbook 1.5]
    [version 1.0]
    [id the_document_name]
    [copyright 2000 2002 2003 Joe Blow, Jane Doe]
    [authors [Blow, Joe] [Doe, Jane]]
    [license The document's license]
    [source-mode c++]
]
        article is the document type. There are several possible document
        types, most of these are based on docbook document elements. These are fully
        described in DocBook: The Definitive
        Guide:
      
        Boostbook also adds another document type library
        for documenting software libraries.
      
So the documentation for the 'foo' library might start:
[library Foo
    [quickbook 1.5]
    [id foo]
    [version 1.0]
]
The document info block has a few different types of attributes. They are all optional.
[quickbook 1.6]
          The quickbook attribute declares the version of quickbook
          the document is written for. In its absence, version 1.1 is assumed. It's
          recommended that you use [quickbook 1.6] which is the version
          described here.
        
| ![[Note]](../../../../doc/src/images/note.png) | Note | 
|---|---|
| 
            The quickbook version also makes some changes to the markup that's generated.
            Most notably, the ids that are automatically for headers and sections
            are different in later versions. To minimise disruption, you can use
            the  [article Article that was original
         written in quickbook 1.3
[quickbook 1.6]
[compatibility-mode 1.3]
]
This feature shouldn't be used for new documents, just for porting old documents to the new version. | 
          Both the quickbook and compatibility-mode
          tags can be used at the start of the file, before the document info block,
          and also in files that don't have a document info block.
        
[source-mode teletype]
          The source-mode attribute sets the initial Source
          Mode. If it is omitted, the default value of c++
          will be used.
        
[id foo]
          id specifies the id of the document element. If it isn't specified
          the id is automatically generated from the title. This id is also used
          to generate the nested ids.
        
[lang en]
          lang specifies the document language. This is used by docbook
          to localize the documentation. Note that Boostbook doesn't have any localization
          support so if you use it to generate the reference documentation it will
          be in English regardless.
        
It should be a language code drawn from ISO 639 (perhaps extended with a country code drawn from ISO 3166, as en-US).
[dirname foo]
          dirname is used to specify the directory name of the library
          in the repository. This is a boostbook extension so it's only valid for
          library documentation blocks. It's used for some boostbook
          functionality, but for pure quickbook documentation has no practical effect.
        
          version, copyright, authors,
          license, last-revision and bibliod
          are optional information.
        
          purpose and category are boostbook
          attributes which are only valid for library documents.
          If you use them for other document types, quickbook will warn about them,
          but still use them, generating invalid markup, that's just ignored by the
          style sheets.
        
Docinfo blocks can only appear at the beginning of a quickbook file, so to create a more complicated document you need to use several quickbook files and use the include tag to nest them. For example, say you wish to create a book with an introduction and a chapter, you first create a file for the book:
[book Simple example [quickbook 1.6] ] [include introduction.qbk] [include chapter.qbk]
| ![[Note]](../../../../doc/src/images/note.png) | Note | 
|---|---|
| 
            Structuring a document like this was introduced in quickbook 1.6, so
            the  | 
          The appropriate document type for an introduction is preface,
          so the contents of introduction.qbk should be something like:
        
[preface Introduction [quickbook 1.6] ] Write the introduction to the book here....
          And chapter.qbk:
        
[chapter A chapter [quickbook 1.6] ] Chapter contents....
Quickbook documents are structured using 'sections'. These are used to generate the table of contents, and, when generating html, to split the document into pages. This is optional but a good idea for all but the simplest of documents.
A sectioned document might look like:
[book Title
    [quickbook 1.5]
]
[section First Section]
[/...]
[endsect]
[section Second Section]
[/...]
[endsect]
        Sections start with the section tag, and end with the [endsect]
        tag. ([/...] is a comment, described
        later).
      
Sections can be given an optional id:
[#quickbook.ref.id] [section:id The Section Title]
        id will be the filename of the generated section. If it is not
        present, "The Section Title" will be normalized and become the
        id. Valid characters are a-Z, A-Z,
        0-9 and _. All non-valid characters
        are converted to underscore and all upper-case are converted to lower case.
        Thus: "The Section Title" will be normalized to "the_section_title".
      
Sections can nest, and that results in a hierarchy in the table of contents.