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+<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+    "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<chapter id="bitbake-user-manual-intro">
+    <title>Overview</title>
+
+    <para>
+        Welcome to the BitBake User Manual.
+        This manual provides information on the BitBake tool.
+        The information attempts to be as independent as possible regarding
+        systems that use BitBake, such as OpenEmbedded and the
+        Yocto Project.
+        In some cases, scenarios or examples within the context of
+        a build system are used in the manual to help with understanding.
+        For these cases, the manual clearly states the context.
+    </para>
+
+    <section id="intro">
+        <title>Introduction</title>
+
+        <para>
+            Fundamentally, BitBake is a generic task execution
+            engine that allows shell and Python tasks to be run
+            efficiently and in parallel while working within
+            complex inter-task dependency constraints.
+            One of BitBake's main users, OpenEmbedded, takes this core
+            and builds embedded Linux software stacks using
+            a task-oriented approach.
+        </para>
+
+        <para>
+            Conceptually, BitBake is similar to GNU Make in
+            some regards but has significant differences:
+            <itemizedlist>
+                <listitem><para>
+                    BitBake executes tasks according to provided
+                    metadata that builds up the tasks.
+                    Metadata is stored in recipe (<filename>.bb</filename>)
+                    and related recipe "append" (<filename>.bbappend</filename>)
+                    files, configuration (<filename>.conf</filename>) and
+                    underlying include (<filename>.inc</filename>) files, and
+                    in class (<filename>.bbclass</filename>) files.
+                    The metadata provides
+                    BitBake with instructions on what tasks to run and
+                    the dependencies between those tasks.
+                    </para></listitem>
+                <listitem><para>
+                    BitBake includes a fetcher library for obtaining source
+                    code from various places such as local files, source control
+                    systems, or websites.
+                    </para></listitem>
+                <listitem><para>
+                    The instructions for each unit to be built (e.g. a piece
+                    of software) are known as "recipe" files and
+                    contain all the information about the unit
+                    (dependencies, source file locations, checksums, description
+                    and so on).
+                    </para></listitem>
+                <listitem><para>
+                    BitBake includes a client/server abstraction and can
+                    be used from a command line or used as a service over
+                    XML-RPC and has several different user interfaces.
+                    </para></listitem>
+            </itemizedlist>
+        </para>
+    </section>
+
+    <section id="history-and-goals">
+        <title>History and Goals</title>
+
+        <para>
+            BitBake was originally a part of the OpenEmbedded project.
+            It was inspired by the Portage package management system
+            used by the Gentoo Linux distribution.
+            On December 7, 2004, OpenEmbedded project team member
+            Chris Larson split the project into two distinct pieces:
+            <itemizedlist>
+                <listitem><para>BitBake, a generic task executor</para></listitem>
+                <listitem><para>OpenEmbedded, a metadata set utilized by
+                    BitBake</para></listitem>
+            </itemizedlist>
+            Today, BitBake is the primary basis of the
+            <ulink url="http://www.openembedded.org/">OpenEmbedded</ulink>
+            project, which is being used to build and maintain Linux
+            distributions such as the
+            <ulink url='http://www.angstrom-distribution.org/'>Angstrom Distribution</ulink>,
+            and which is also being used as the build tool for Linux projects
+            such as the
+            <ulink url='http://www.yoctoproject.org'>Yocto Project</ulink>.
+        </para>
+
+        <para>
+            Prior to BitBake, no other build tool adequately met the needs of
+            an aspiring embedded Linux distribution.
+            All of the build systems used by traditional desktop Linux
+            distributions lacked important functionality, and none of the
+            ad hoc Buildroot-based systems, prevalent in the
+            embedded space, were scalable or maintainable.
+        </para>
+
+        <para>
+            Some important original goals for BitBake were:
+            <itemizedlist>
+                <listitem><para>
+                    Handle cross-compilation.
+                    </para></listitem>
+                <listitem><para>
+                    Handle inter-package dependencies (build time on
+                    target architecture, build time on native
+                    architecture, and runtime).
+                    </para></listitem>
+                <listitem><para>
+                    Support running any number of tasks within a given
+                    package, including, but not limited to, fetching
+                    upstream sources, unpacking them, patching them,
+                    configuring them, and so forth.
+                    </para></listitem>
+                <listitem><para>
+                    Be Linux distribution agnostic for both build and
+                    target systems.
+                    </para></listitem>
+                <listitem><para>
+                    Be architecture agnostic.
+                    </para></listitem>
+                <listitem><para>
+                    Support multiple build and target operating systems
+                    (e.g. Cygwin, the BSDs, and so forth).
+                    </para></listitem>
+                <listitem><para>
+                    Be self contained, rather than tightly
+                    integrated into the build machine's root
+                    filesystem.
+                    </para></listitem>
+                <listitem><para>
+                    Handle conditional metadata on the target architecture,
+                    operating system, distribution, and machine.
+                    </para></listitem>
+                <listitem><para>
+                    Be easy to use the tools to supply local metadata and packages
+                    against which to operate.
+                    </para></listitem>
+                <listitem><para>
+                    Be easy to use BitBake to collaborate between multiple
+                    projects for their builds.
+                    </para></listitem>
+                <listitem><para>
+                    Provide an inheritance mechanism to share
+                    common metadata between many packages.
+                    </para></listitem>
+            </itemizedlist>
+            Over time it became apparent that some further requirements
+            were necessary:
+            <itemizedlist>
+                <listitem><para>
+                    Handle variants of a base recipe (e.g. native, sdk,
+                    and multilib).
+                    </para></listitem>
+                <listitem><para>
+                    Split metadata into layers and allow layers
+                    to enhance or override other layers.
+                    </para></listitem>
+                <listitem><para>
+                    Allow representation of a given set of input variables
+                    to a task as a checksum.
+                    Based on that checksum, allow acceleration of builds
+                    with prebuilt components.
+                    </para></listitem>
+            </itemizedlist>
+            BitBake satisfies all the original requirements and many more
+            with extensions being made to the basic functionality to
+            reflect the additional requirements.
+            Flexibility and power have always been the priorities.
+            BitBake is highly extensible and supports embedded Python code and
+            execution of any arbitrary tasks.
+        </para>
+    </section>
+
+    <section id="Concepts">
+        <title>Concepts</title>
+
+        <para>
+            BitBake is a program written in the Python language.
+            At the highest level, BitBake interprets metadata, decides
+            what tasks are required to run, and executes those tasks.
+            Similar to GNU Make, BitBake controls how software is
+            built.
+            GNU Make achieves its control through "makefiles", while
+            BitBake uses "recipes".
+        </para>
+
+        <para>
+            BitBake extends the capabilities of a simple
+            tool like GNU Make by allowing for the definition of much more
+            complex tasks, such as assembling entire embedded Linux
+            distributions.
+        </para>
+
+        <para>
+            The remainder of this section introduces several concepts
+            that should be understood in order to better leverage
+            the power of BitBake.
+        </para>
+
+        <section id='recipes'>
+            <title>Recipes</title>
+
+            <para>
+                BitBake Recipes, which are denoted by the file extension
+                <filename>.bb</filename>, are the most basic metadata files.
+                These recipe files provide BitBake with the following:
+                <itemizedlist>
+                    <listitem><para>Descriptive information about the
+                        package (author, homepage, license, and so on)</para></listitem>
+                    <listitem><para>The version of the recipe</para></listitem>
+                    <listitem><para>Existing dependencies (both build
+                        and runtime dependencies)</para></listitem>
+                    <listitem><para>Where the source code resides and
+                        how to fetch it</para></listitem>
+                    <listitem><para>Whether the source code requires
+                        any patches, where to find them, and how to apply
+                        them</para></listitem>
+                    <listitem><para>How to configure and compile the
+                        source code</para></listitem>
+                    <listitem><para>Where on the target machine to install the
+                        package or packages created</para></listitem>
+                </itemizedlist>
+            </para>
+
+            <para>
+                Within the context of BitBake, or any project utilizing BitBake
+                as its build system, files with the <filename>.bb</filename>
+                extension are referred to as recipes.
+                <note>
+                    The term "package" is also commonly used to describe recipes.
+                    However, since the same word is used to describe packaged
+                    output from a project, it is best to maintain a single
+                    descriptive term - "recipes".
+                    Put another way, a single "recipe" file is quite capable
+                    of generating a number of related but separately installable
+                    "packages".
+                    In fact, that ability is fairly common.
+                </note>
+            </para>
+        </section>
+
+        <section id='configuration-files'>
+            <title>Configuration Files</title>
+
+            <para>
+                Configuration files, which are denoted by the
+                <filename>.conf</filename> extension, define
+                various configuration variables that govern the project's build
+                process.
+                These files fall into several areas that define
+                machine configuration options, distribution configuration
+                options, compiler tuning options, general common
+                configuration options, and user configuration options.
+                The main configuration file is the sample
+                <filename>bitbake.conf</filename> file, which is
+                located within the BitBake source tree
+                <filename>conf</filename> directory.
+            </para>
+        </section>
+
+        <section id='classes'>
+            <title>Classes</title>
+
+            <para>
+                Class files, which are denoted by the
+                <filename>.bbclass</filename> extension, contain
+                information that is useful to share between metadata files.
+                The BitBake source tree currently comes with one class metadata file
+                called <filename>base.bbclass</filename>.
+                You can find this file in the
+                <filename>classes</filename> directory.
+                The <filename>base.bbclass</filename> class files is special since it
+                is always included automatically for all recipes
+                and classes.
+                This class contains definitions for standard basic tasks such
+                as fetching, unpacking, configuring (empty by default),
+                compiling (runs any Makefile present), installing (empty by
+                default) and packaging (empty by default).
+                These tasks are often overridden or extended by other classes
+                added during the project development process.
+            </para>
+        </section>
+
+        <section id='layers'>
+            <title>Layers</title>
+
+            <para>
+                Layers allow you to isolate different types of
+                customizations from each other.
+                While you might find it tempting to keep everything in one layer
+                when working on a single project, the more modular you organize
+                your metadata, the easier it is to cope with future changes.
+            </para>
+
+            <para>
+                To illustrate how you can use layers to keep things modular,
+                consider customizations you might make to support a specific target machine.
+                These types of customizations typically reside in a special layer,
+                rather than a general layer, called a Board Support Package (BSP)
+                Layer.
+                Furthermore, the machine customizations should be isolated from
+                recipes and metadata that support a new GUI environment, for
+                example.
+                This situation gives you a couple of layers: one for the machine
+                configurations and one for the GUI environment.
+                It is important to understand, however, that the BSP layer can still
+                make machine-specific additions to recipes within
+                the GUI environment layer without polluting the GUI layer itself
+                with those machine-specific changes.
+                You can accomplish this through a recipe that is a BitBake append
+                (<filename>.bbappend</filename>) file.
+            </para>
+        </section>
+
+        <section id='append-bbappend-files'>
+            <title>Append Files</title>
+
+            <para>
+                Append files, which are files that have the
+                <filename>.bbappend</filename> file extension, extend or
+                override information in an existing recipe file.
+            </para>
+
+            <para>
+                BitBake expects every append file to have a corresponding recipe file.
+                Furthermore, the append file and corresponding recipe file
+                must use the same root filename.
+                The filenames can differ only in the file type suffix used
+                (e.g. <filename>formfactor_0.0.bb</filename> and
+                <filename>formfactor_0.0.bbappend</filename>).
+            </para>
+
+            <para>
+                Information in append files extends or
+                overrides the information in the underlying,
+                similarly-named recipe files.
+            </para>
+
+            <para>
+                When you name an append file, you can use the
+                wildcard character (%) to allow for matching recipe names.
+                For example, suppose you have an append file named
+                as follows:
+                <literallayout class='monospaced'>
+     busybox_1.21.%.bbappend
+                </literallayout>
+                That append file would match any <filename>busybox_1.21.x.bb</filename>
+                version of the recipe.
+                So, the append file would match the following recipe names:
+                <literallayout class='monospaced'>
+     busybox_1.21.1.bb
+     busybox_1.21.2.bb
+     busybox_1.21.3.bb
+                </literallayout>
+                If the <filename>busybox</filename> recipe was updated to
+                <filename>busybox_1.3.0.bb</filename>, the append name would not
+                match.
+                However, if you named the append file
+                <filename>busybox_1.%.bbappend</filename>, then you would have a match.
+            </para>
+
+            <para>
+                In the most general case, you could name the append file something as
+                simple as <filename>busybox_%.bbappend</filename> to be entirely
+                version independent.
+            </para>
+        </section>
+    </section>
+
+    <section id='obtaining-bitbake'>
+        <title>Obtaining BitBake</title>
+
+        <para>
+            You can obtain BitBake several different ways:
+            <itemizedlist>
+                <listitem><para><emphasis>Cloning BitBake:</emphasis>
+                    Using Git to clone the BitBake source code repository
+                    is the recommended method for obtaining BitBake.
+                    Cloning the repository makes it easy to get bug fixes
+                    and have access to stable branches and the master
+                    branch.
+                    Once you have cloned BitBake, you should use
+                    the latest stable
+                    branch for development since the master branch is for
+                    BitBake development and might contain less stable changes.
+                    </para>
+                    <para>You usually need a version of BitBake
+                    that matches the metadata you are using.
+                    The metadata is generally backwards compatible but
+                    not forward compatible.</para>
+                    <para>Here is an example that clones the BitBake repository:
+                    <literallayout class='monospaced'>
+     $ git clone git://git.openembedded.org/bitbake
+                    </literallayout>
+                    This command clones the BitBake Git repository into a
+                    directory called <filename>bitbake</filename>.
+                    Alternatively, you can
+                    designate a directory after the
+                    <filename>git clone</filename> command
+                    if you want to call the new directory something
+                    other than <filename>bitbake</filename>.
+                    Here is an example that names the directory
+                    <filename>bbdev</filename>:
+                    <literallayout class='monospaced'>
+     $ git clone git://git.openembedded.org/bitbake bbdev
+                    </literallayout></para></listitem>
+                <listitem><para><emphasis>Installation using your Distribution
+                    Package Management System:</emphasis>
+                    This method is not
+                    recommended because the BitBake version that is
+                    provided by your distribution, in most cases,
+                    is several
+                    releases behind a snapshot of the BitBake repository.
+                    </para></listitem>
+                <listitem><para><emphasis>Taking a snapshot of BitBake:</emphasis>
+                    Downloading a snapshot of BitBake from the
+                    source code repository gives you access to a known
+                    branch or release of BitBake.
+                    <note>
+                         Cloning the Git repository, as described earlier,
+                         is the preferred method for getting BitBake.
+                         Cloning the repository makes it easier to update as
+                         patches are added to the stable branches.
+                    </note></para>
+                    <para>The following example downloads a snapshot of
+                    BitBake version 1.17.0:
+                    <literallayout class='monospaced'>
+     $ wget http://git.openembedded.org/bitbake/snapshot/bitbake-1.17.0.tar.gz
+     $ tar zxpvf bitbake-1.17.0.tar.gz
+                    </literallayout>
+                    After extraction of the tarball using the tar utility,
+                    you have a directory entitled
+                    <filename>bitbake-1.17.0</filename>.
+                    </para></listitem>
+                <listitem><para><emphasis>Using the BitBake that Comes With Your
+                    Build Checkout:</emphasis>
+                    A final possibility for getting a copy of BitBake is that it
+                    already comes with your checkout of a larger Bitbake-based build
+                    system, such as Poky or Yocto Project.
+                    Rather than manually checking out individual layers and
+                    gluing them together yourself, you can check
+                    out an entire build system.
+                    The checkout will already include a version of BitBake that
+                    has been thoroughly tested for compatibility with the other
+                    components.
+                    For information on how to check out a particular BitBake-based
+                    build system, consult that build system's supporting documentation.
+                    </para></listitem>
+            </itemizedlist>
+        </para>
+    </section>
+
+    <section id="bitbake-user-manual-command">
+        <title>The BitBake Command</title>
+
+        <para>
+            The <filename>bitbake</filename> command is the primary interface
+            to the BitBake tool.
+            This section presents the BitBake command syntax and provides
+            several execution examples.
+        </para>
+
+        <section id='usage-and-syntax'>
+            <title>Usage and syntax</title>
+
+            <para>
+                Following is the usage and syntax for BitBake:
+                <literallayout class='monospaced'>
+     $ bitbake -h
+     Usage: bitbake [options] [recipename/target ...]
+
+         Executes the specified task (default is 'build') for a given set of target recipes (.bb files).
+         It is assumed there is a conf/bblayers.conf available in cwd or in BBPATH which
+         will provide the layer, BBFILES and other configuration information.
+
+     Options:
+       --version             show program's version number and exit
+       -h, --help            show this help message and exit
+       -b BUILDFILE, --buildfile=BUILDFILE
+                             Execute tasks from a specific .bb recipe directly.
+                             WARNING: Does not handle any dependencies from other
+                             recipes.
+       -k, --continue        Continue as much as possible after an error. While the
+                             target that failed and anything depending on it cannot
+                             be built, as much as possible will be built before
+                             stopping.
+       -a, --tryaltconfigs   Continue with builds by trying to use alternative
+                             providers where possible.
+       -f, --force           Force the specified targets/task to run (invalidating
+                             any existing stamp file).
+       -c CMD, --cmd=CMD     Specify the task to execute. The exact options
+                             available depend on the metadata. Some examples might
+                             be 'compile' or 'populate_sysroot' or 'listtasks' may
+                             give a list of the tasks available.
+       -C INVALIDATE_STAMP, --clear-stamp=INVALIDATE_STAMP
+                             Invalidate the stamp for the specified task such as
+                             'compile' and then run the default task for the
+                             specified target(s).
+       -r PREFILE, --read=PREFILE
+                             Read the specified file before bitbake.conf.
+       -R POSTFILE, --postread=POSTFILE
+                             Read the specified file after bitbake.conf.
+       -v, --verbose         Output more log message data to the terminal.
+       -D, --debug           Increase the debug level. You can specify this more
+                             than once.
+       -n, --dry-run         Don't execute, just go through the motions.
+       -S SIGNATURE_HANDLER, --dump-signatures=SIGNATURE_HANDLER
+                             Dump out the signature construction information, with
+                             no task execution. The SIGNATURE_HANDLER parameter is
+                             passed to the handler. Two common values are none and
+                             printdiff but the handler may define more/less. none
+                             means only dump the signature, printdiff means compare
+                             the dumped signature with the cached one.
+       -p, --parse-only      Quit after parsing the BB recipes.
+       -s, --show-versions   Show current and preferred versions of all recipes.
+       -e, --environment     Show the global or per-recipe environment complete
+                             with information about where variables were
+                             set/changed.
+       -g, --graphviz        Save dependency tree information for the specified
+                             targets in the dot syntax.
+       -I EXTRA_ASSUME_PROVIDED, --ignore-deps=EXTRA_ASSUME_PROVIDED
+                             Assume these dependencies don't exist and are already
+                             provided (equivalent to ASSUME_PROVIDED). Useful to
+                             make dependency graphs more appealing
+       -l DEBUG_DOMAINS, --log-domains=DEBUG_DOMAINS
+                             Show debug logging for the specified logging domains
+       -P, --profile         Profile the command and save reports.
+       -u UI, --ui=UI        The user interface to use (e.g. knotty, hob, depexp).
+       -t SERVERTYPE, --servertype=SERVERTYPE
+                             Choose which server to use, process or xmlrpc.
+       --token=XMLRPCTOKEN   Specify the connection token to be used when
+                             connecting to a remote server.
+       --revisions-changed   Set the exit code depending on whether upstream
+                             floating revisions have changed or not.
+       --server-only         Run bitbake without a UI, only starting a server
+                             (cooker) process.
+       -B BIND, --bind=BIND  The name/address for the bitbake server to bind to.
+       --no-setscene         Do not run any setscene tasks. sstate will be ignored
+                             and everything needed, built.
+       --remote-server=REMOTE_SERVER
+                             Connect to the specified server.
+       -m, --kill-server     Terminate the remote server.
+       --observe-only        Connect to a server as an observing-only client.
+       --status-only         Check the status of the remote bitbake server.
+                </literallayout>
+            </para>
+        </section>
+
+        <section id='bitbake-examples'>
+            <title>Examples</title>
+
+            <para>
+                This section presents some examples showing how to use BitBake.
+            </para>
+
+            <section id='example-executing-a-task-against-a-single-recipe'>
+                <title>Executing a Task Against a Single Recipe</title>
+
+                <para>
+                    Executing tasks for a single recipe file is relatively simple.
+                    You specify the file in question, and BitBake parses
+                    it and executes the specified task.
+                    If you do not specify a task, BitBake executes the default
+                    task, which is "build”.
+                    BitBake obeys inter-task dependencies when doing
+                    so.
+                </para>
+
+                <para>
+                    The following command runs the build task, which is
+                    the default task, on the <filename>foo_1.0.bb</filename>
+                    recipe file:
+                    <literallayout class='monospaced'>
+     $ bitbake -b foo_1.0.bb
+                    </literallayout>
+                    The following command runs the clean task on the
+                    <filename>foo.bb</filename> recipe file:
+                    <literallayout class='monospaced'>
+     $ bitbake -b foo.bb -c clean
+                    </literallayout>
+                    <note>
+                        The "-b" option explicitly does not handle recipe
+                        dependencies.
+                        Other than for debugging purposes, it is instead
+                        recommended that you use the syntax presented in the
+                        next section.
+                    </note>
+                </para>
+            </section>
+
+            <section id='executing-tasks-against-a-set-of-recipe-files'>
+                <title>Executing Tasks Against a Set of Recipe Files</title>
+
+                <para>
+                    There are a number of additional complexities introduced
+                    when one wants to manage multiple <filename>.bb</filename>
+                    files.
+                    Clearly there needs to be a way to tell BitBake what
+                    files are available and, of those, which you
+                    want to execute.
+                    There also needs to be a way for each recipe
+                    to express its dependencies, both for build-time and
+                    runtime.
+                    There must be a way for you to express recipe preferences
+                    when multiple recipes provide the same functionality, or when
+                    there are multiple versions of a recipe.
+                </para>
+
+                <para>
+                    The <filename>bitbake</filename> command, when not using
+                    "--buildfile" or "-b" only accepts a "PROVIDES".
+                    You cannot provide anything else.
+                    By default, a recipe file generally "PROVIDES" its
+                    "packagename" as shown in the following example:
+                    <literallayout class='monospaced'>
+     $ bitbake foo
+                    </literallayout>
+                    This next example "PROVIDES" the package name and also uses
+                    the "-c" option to tell BitBake to just execute the
+                    <filename>do_clean</filename> task:
+                    <literallayout class='monospaced'>
+     $ bitbake -c clean foo
+                    </literallayout>
+                </para>
+            </section>
+
+            <section id='generating-dependency-graphs'>
+                <title>Generating Dependency Graphs</title>
+
+                <para>
+                    BitBake is able to generate dependency graphs using
+                    the <filename>dot</filename> syntax.
+                    You can convert these graphs into images using the
+                    <filename>dot</filename> tool from
+                    <ulink url='http://www.graphviz.org'>Graphviz</ulink>.
+                </para>
+
+                <para>
+                    When you generate a dependency graph, BitBake writes four files
+                    to the current working directory:
+                    <itemizedlist>
+                        <listitem><para><emphasis><filename>package-depends.dot</filename>:</emphasis>
+                            Shows BitBake's knowledge of dependencies between
+                            runtime targets.
+                            </para></listitem>
+                        <listitem><para><emphasis><filename>pn-depends.dot</filename>:</emphasis>
+                            Shows dependencies between build-time targets
+                            (i.e. recipes).
+                            </para></listitem>
+                        <listitem><para><emphasis><filename>task-depends.dot</filename>:</emphasis>
+                            Shows dependencies between tasks.
+                            </para></listitem>
+                        <listitem><para><emphasis><filename>pn-buildlist</filename>:</emphasis>
+                            Shows a simple list of targets that are to be built.
+                            </para></listitem>
+                    </itemizedlist>
+                </para>
+
+                <para>
+                    To stop depending on common depends, use the "-I" depend
+                    option and BitBake omits them from the graph.
+                    Leaving this information out can produce more readable graphs.
+                    This way, you can remove from the graph
+                    <filename>DEPENDS</filename> from inherited classes
+                    such as <filename>base.bbclass</filename>.
+                </para>
+
+                <para>
+                    Here are two examples that create dependency graphs.
+                    The second example omits depends common in OpenEmbedded from
+                    the graph:
+                    <literallayout class='monospaced'>
+     $ bitbake -g foo
+
+     $ bitbake -g -I virtual/kernel -I eglibc foo
+                    </literallayout>
+                </para>
+            </section>
+        </section>
+    </section>
+</chapter>