doc: Add Simplified Chinese translation.

* doc/local.mk (info_TEXINFOS): Add guix.zh_CN.texi.
(TRANSLATED_INFO): Add guix.zh_CN.texi and contributing.zh_CN.texi.
* po/doc/local.mk (DOC_PO_FILES): Add guix-manual.zh_CN.po.
* doc/contributing.zh_CN.texi, doc/guix.zh_CN.texi: New files.

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+@node 贡献
+@chapter 贡献
+
+这个项目是大家合作的成果，我们需要你的帮助以更好地发展。请通过
+@email{guix-devel@@gnu.org} 和 Freenode IRC 上的 @code{#guix} 联系我们。我们欢迎
+您的想法、bug反馈、补丁，以及任何可能对项目有帮助的贡献。我们特别欢迎帮助我们打
+包（@pxref{打包指导}）。
+
+@cindex 行为准则和贡献者
+@cindex 贡献者契约
+我们希望提供一个温暖、友好，并且没有骚扰的的环境，这样每个人都能尽最大努力贡献。
+为了这个目的，我们的项目遵循“贡献者契约”，这个契约是根据
+@url{http://contributor-covenant.org/}制定的。你可以在源代码目录里的
+@file{CODE-OF-CONDUCT}文件里找到一份本地版。
+
+贡献者在提交补丁和网上交流时不需要使用法律认可的名字。他们可以使用任何名字或者假
+名。
+
+@menu
+* 从Git编译::             最新的并且最好的.
+* 在安装之前运行Guix::  黑客技巧。
+* 完美的配置::          正确的工具。
+* 打包指导::             Growing the distribution.
+* 代码风格::             开发者的卫生情况
+* 提交补丁::             分享你的工作。
+@end menu
+
+@node 从Git编译
+@section 从Git编译
+
+如果你想折腾Guix本身，建议使用Git仓库里最新的版本：
+
+@example
+git clone https://git.savannah.gnu.org/git/guix.git
+@end example
+
+当从Git检出构建Guix时，除安装指导（@pxref{Requirements}）里提及的软件包之外还需
+要这些包。
+
+@itemize
+@item @url{http://gnu.org/software/autoconf/, GNU Autoconf};
+@item @url{http://gnu.org/software/automake/, GNU Automake};
+@item @url{http://gnu.org/software/gettext/, GNU Gettext};
+@item @url{http://gnu.org/software/texinfo/, GNU Texinfo};
+@item @url{http://www.graphviz.org/, Graphviz};
+@item @url{http://www.gnu.org/software/help2man/, GNU Help2man （可选）}。
+@end itemize
+
+设置Guix开发环境的最简单的方式当然是使用Guix！下面这些命令启动一个shell，所有的
+依赖和环境变量都为折腾Guix设置好了：
+
+@example
+guix environment guix
+@end example
+
+这个命令更多的信息请参考@xref{Invoking guix environment}。额外的依赖可以通过
+@option{--ad-hoc}选项添加：
+
+@example
+guix environment guix --ad-hoc help2man git strace
+@end example
+
+运行 @command{./bootstrap} 以使用Autoconf和Automake生成编译系统的基础框架。如果
+你的得到这样的错误：
+
+@example
+configure.ac:46: error: possibly undefined macro: PKG_CHECK_MODULES
+@end example
+
+@noindent
+它可能意味着Autoconf无法找到由pkg-config提供的@file{pkg.m4}。请确保@file{pkg.m4}
+可用。由Guile提供的@file{guile.m4}宏也类似。假如你的Automake安装在
+@file{/usr/local}，那么它不会从@file{/usr/share}里寻找@file{.m4}文件。这种情况下，
+你必须执行下面这个命令：
+
+@example
+export ACLOCAL_PATH=/usr/share/aclocal
+@end example
+
+参考@xref{Macro Search Path,,, automake, The GNU Automake Manual}.
+
+然后，像正常一样运行@command{./configure}。确保提供
+@code{--localstatedir=@var{directory}}参数，@var{directory}是你当前系统的
+@code{localstatedir}的值。（@pxref{The Store}）
+
+最后，用@code{make check}执行测试（@pxref{Running the Test Suite}）。如果遇到任
+何错误，请参考“安装指导”（@pxref{Installation}）或者给
+@email{guix-devel@@gnu.org, 邮件列表}发邮件。
+
+
+@node 在安装之前运行Guix
+@section 在安装之前运行Guix
+
+为了保持一个合适的工作环境，你会发现在你的本地代码树里测试修改而不用安装它们会很
+有用。TODO: So that you can distinguish between your ``end-user'' hat and your
+``motley'' costume.
+
+这样，即使你没有运行@code{make install}，所有的命令行工具都可以使用。为此，你先
+要有一个包含全部依赖的环境（@pxref{从Git编译}），然后，为所有的命令添加
+前缀@command{./pre-inst-env}（@file{pre-inst-env}脚本在Guix编译树的最顶层，它由
+@command{./configure}生成），如@footnote{@command{sudo}命令的@option{-E}参数
+确保@code{GUILE_LOAD_PATH}被正确设置，从而@command{guix-daemon}和它使用的工具可
+以找到它们需要的Guile模块。}：
+
+@example
+$ sudo -E ./pre-inst-env guix-daemon --build-users-group=guixbuild
+$ ./pre-inst-env guix build hello
+@end example
+
+@noindent
+类似的，对于使用Guix模块的Guile会话：
+
+@example
+$ ./pre-inst-env guile -c '(use-modules (guix utils)) (pk (%current-system))'
+
+;;; ("x86_64-linux")
+@end example
+
+@noindent
+@cindex REPL
+@cindex read-eval-print loop
+@dots{} and for a REPL (@pxref{Using Guile Interactively,,, guile, Guile
+Reference Manual}):
+
+@example
+$ ./pre-inst-env guile
+scheme@@(guile-user)> ,use(guix)
+scheme@@(guile-user)> ,use(gnu)
+scheme@@(guile-user)> (define snakes
+                       (fold-packages
+                         (lambda (package lst)
+                           (if (string-prefix? "python"
+                                               (package-name package))
+                               (cons package lst)
+                               lst))
+                         '()))
+scheme@@(guile-user)> (length snakes)
+$1 = 361
+@end example
+
+@command{pre-inst-env}脚本设置为此好了所有必要的的环境变量，包括@env{PATH}和
+@env{GUILE_LOAD_PATH}。
+
+@command{./pre-inst-env guix pull} @emph{不} 会更新本地源代码树，它只更新符号链
+接@file{~/.config/guix/current} (@pxref{Invoking guix pull})。如果你想更新本地源
+代码树，请运行@command{git pull}。
+
+
+@node 完美的配置
+@section 完美的配置
+
+折腾Guix的完美配置也是折腾Guile的完美配置@pxref{Using Guile in Emacs,,, guile,
+Guile Reference Manual})。首先，你需要的不仅是一个编辑器，你需要
+@url{http://www.gnu.org/software/emacs, Emacs}，以及美妙的
+@url{http://nongnu.org/geiser/, Geiser}。为此，请运行：
+
+@example
+guix package -i emacs guile emacs-geiser
+@end example
+
+Geiser允许在Emacs里进行交互式的、增长式的开发：buffer里的代码补全和执行，获取一
+行的文档（docstrings），上下文敏感的补全，@kbd{M-.}跳转到对象定义，测试代码的
+REPL，及更多（@pxref{Introduction,,, geiser, Geiser User Manual}）。为了方便的
+Guix开发，请确保修改Guile的加载路径（load path）以使其能从你的项目里找到源代码文
+件。
+
+@lisp
+;; @r{假设Guix项目在 ~/src/guix.}
+(with-eval-after-load 'geiser-guile
+  (add-to-list 'geiser-guile-load-path "~/src/guix"))
+@end lisp
+
+真正编辑代码时别忘了Emacs自带了方便的Scheme模式。而且，一定不要错过
+@url{http://www.emacswiki.org/emacs/ParEdit, Paredit}。它提供了直接操作语法树的
+的功能，例如，用S-表达式替换父节点，为S-表达式添加、删除前后的括号，删除后面的S-
+表达式，等等。
+
+@cindex 代码片段
+@cindex 模板
+@cindex reducing boilerplate
+在@file{etc/snippets}文件夹里，我们还为普通的git commit信息和软件包定义提供模板。
+这些模板可以通过@url{http://joaotavora.github.io/yasnippet/, YASnippet}使用，它
+可以把短的触发字符串扩展成交互式的文字片段。你可能希望将这个文件夹添加到Emacs的
+@var{yas-snippet-dirs}变量里。
+
+@lisp
+;; @r{假设Guix项目在 ~/src/guix.}
+(with-eval-after-load 'yasnippet
+  (add-to-list 'yas-snippet-dirs "~/src/guix/etc/snippets"))
+@end lisp
+
+commit信息片段显示staged文件需要依赖@url{https://magit.vc/, Magit}。编辑commit信
+息时，输入@code{add}，然后按@kbd{TAB}就可以插入一段用于新增软件包的模板；输入
+@code{update}，然后按@kbd{TAB}可以插入一段更新软件包的模板；输入@code{https}然后
+按@kbd{TAB}可以插入一段修改主页URI为HTTPS的模板。
+
+@code{scheme-mode}最重要的模板可以通过输入@code{package...}，然后按@kbd{TAB}触发。
+这个片段还插入了触发字符串@code{origin...}，以进一步展开。@code{origin}片段更进
+一步的可能插入其它以@code{...}结尾的触发字符串，它们可以被继续展开。
+
+
+@node 打包指导
+@section 打包指导
+
+@cindex 软件包, 创建
+这个GNU发行版正在开发的早期阶段，可能缺少一些你喜欢的软件。这个章节介绍你可以怎
+样帮助这个发行版成长。
+
+自由软件通常以@dfn{源代码包}的形式分发，通常是包含完整代码的@file{tar.gz}包。添
+加软件包到这个发行版意味着两件事：添加描述如何编译包的@dfn{配方}和一系列依赖软件，
+以及添加配方之外的@dfn{软件包元数据}，如一段文字描述和证书信息。
+
+在Guix里所有这些信息都包含在@dfn{软件包定义}里。软件包定义提供了软件包的高层视角。
+它们使用Scheme编程语言编写，事实上，对每个软件包我们都定义一个绑定到软件包定义的
+的变量，并且从模块（@pxref{Package Modules}）中导出那个变量。然而，深入的Scheme
+知识@emph{不}是创建软件包的前提条件。若要了解软件包的更多信息，@pxref{Defining
+Packages}。
+
+一旦软件包定义准备好了，并且包存在Guix代码树的一个文件里，你可以用@command{guix
+build} (@pxref{Invoking guix build})命令测试它。假设这个新软件包的名字叫做
+@code{gnew}，你可以在Guix编译树里运行这个命令(@pxref{在安装之前运行Guix})：
+
+@example
+./pre-inst-env guix build gnew --keep-failed
+@end example
+
+使用@code{--keep-failed}参数会保留失败的编译树，这可以使调试编译错误更容易。
+@code{--log-file}也是一个调试时很有用的参数，它可以用来访问编译日志。
+
+如果@command{guix}命令找不到这个软件包，那可能是因为源文件包含语法错误，或者缺少
+导出软件包的@code{define-public}语句。为了查找错误，你可以用Guile导入这个模块以
+了解这个错误的详情：
+
+@example
+./pre-inst-env guile -c '(use-modules (gnu packages gnew))'
+@end example
+
+一旦你的软件包可以正确编译，请给我们发送补丁（@pxref{提交补丁}）。当然，
+如果你需要帮助，我们也会很乐意帮助你。一旦补丁被提交到Guix仓库里，这个新的软件包
+会被自动地在支持的平台上编译@url{http://hydra.gnu.org/jobset/gnu/master, our
+continuous integration system}。
+
+@cindex substituter
+用户可以通过运行@command{guix pull}命令获取最新的软件包定义（@pxref{Invoking
+guix pull}）。当@code{@value{SUBSTITUTE-SERVER}}编译好这些软件包之后，安装这些软
+件包时会自动从服务器（@pxref{Substitutes}）上下载编译好的二进制包。唯一需要人工
+干预的地方是评审和应用代码补丁。
+
+
+@menu
+* 软件自由::             什么可以进入这个发行版。
+* 软件包命名::          名字里包含什么？
+* 版本号::                当名字不够时
+* 简介和描述::          帮助用户寻找合适的软件包
+* Python模块::             接触英式的喜剧
+* Perl模块::               小珍珠。
+* Java包::                  喝咖啡休息。
+* 字体::                   字体的乐趣。
+@end menu
+
+@node 软件自由
+@subsection 软件自由
+
+@c ===========================================================================
+@c
+@c This file was generated with po4a. Translate the source file.
+@c
+@c ===========================================================================
+@c Adapted from http://www.gnu.org/philosophy/philosophy.html.
+@cindex 自由软件
+开发GNU操作系统是为了用户拥有计算的自由。GNU是@dfn{自由软件}，这意味着它有
+@url{http://www.gnu.org/philosophy/free-sw.html,四项重要的自由}：运行程序的自由，
+以源代码形式学习和修改程序的自由，原样重新分发副本的自由，和分发修改后的版本的自
+由。GNU发行版里包含的软件包只提供遵守这四项自由的软件。
+
+此外，GNU发行版遵循
+@url{http://www.gnu.org/distros/free-system-distribution-guidelines.html,自由软
+件发行版准则}。这些准则拒绝非自由的固件和对非自由软件的推荐，并讨论解决商标和专
+利的方法。
+
+某些上游的软件包源代码包含一小部分违反上述准则的可选的子集，比如这个子集本身就是
+非自由代码。这时，这些讨厌的代码需要用合适的补丁或者软件包定义（@pxref{Defining
+Packages}）里的@code{origin}里的代码片段移除。这样，@code{guix build --source}就
+可以返回自由的源代码而不是未经修改的上游源代码。
+
+
+@node 软件包命名
+@subsection 软件包命名
+
+@cindex 软件包名字
+一个软件包事实上有两个名字：第一个是@emph{Scheme变量}的名字，即用
+@code{define-public}定义的名字。通过这个名字，软件包可以被Scheme代码找到，如用作
+其它软件包的输入。第二个名字是软件包定义里的@code{name}属性的字符串值。这个名字
+用于软件包管理命令，如：@command{guix package}，@command{guix build}
+
+两个名字通常是相同的，常是上游项目名字转成小写字母并把下划线替换成连字符的结果。
+比如，GNUnet转成@code{gnunet}，SDL_net转成@code{sdl-net}。
+
+我们不给库软件包添加@code{lib}前缀，除非它是项目官方名字的一部分。但是
+@pxref{Python模块}和@ref{Perl模块}有关于Python和Perl语言的特殊规则。
+
+字体软件包的名字处理起来不同，@pxref{字体}.
+
+
+@node 版本号
+@subsection 版本号
+
+@cindex 软件包版本
+我们通常只为每个自由软件的最新版本打包。但是有时候，比如对于版本不兼容的库，需要
+有同一个软件包的两个或更多版本。它们需要使用不同的Scheme变量名。我们为最新的版本
+使用@ref{软件包命名}里规定的名字，旧的版本使用加上后缀的名字，后缀是@code{-}
+和可以区分开版本号的版本号的最小前缀。
+
+软件包定义里的名字对于同一个软件包的所有版本都是相同的，并且不含有版本号。
+
+例如，GTK+的2.24.20和3.9.12两个版本可以这样打包：
+
+@example
+(define-public gtk+
+  (package
+    (name "gtk+")
+    (version "3.9.12")
+    ...))
+(define-public gtk+-2
+  (package
+    (name "gtk+")
+    (version "2.24.20")
+    ...))
+@end example
+如果我们还需要GTK+ 3.8.2，就这样打包
+@example
+(define-public gtk+-3.8
+  (package
+    (name "gtk+")
+    (version "3.8.2")
+    ...))
+@end example
+
+@c See <https://lists.gnu.org/archive/html/guix-devel/2016-01/msg00425.html>,
+@c for a discussion of what follows.
+@cindex 用于版本控制快照的版本号
+有时候，我们为软件包上游的版本控制系统（VCS）的快照而不是正式发布版打包。这是特
+殊情况，因为决定哪个是稳定版的权力应该属于上游开发者。然而，有时候这是必须的。那
+么，我们该如何决定写在@code{version}里的版本号呢？
+
+显然，我们需要让VCS快照的commit ID在版本号中体现出来，但是我们也需要确保版本号单
+调递增，以便@command{guix package --upgrade}决定哪个版本号更新。由于commit ID，
+尤其是Git的commit ID，不是单调递增的，我们添加一个每次升级快照时都手动增长的
+revision数字。最后的版本号字符串看起来是这样：
+
+@example
+2.0.11-3.cabba9e
+  ^    ^    ^
+  |    |    `-- 上游的commit ID
+  |    |
+  |    `--- Guix软件包的revision
+  |
+最新的上游版本号
+@end example
+
+把@code{版本号}里的commit ID截短，比如只取7个数字，是一个好主意。它避免了美学上
+的烦恼（假设美学在这里很重要），以及操作系统限制引起的问题（比如Linux内核的127字
+节）。尽管如此，在@code{origin}里最好使用完整的commit ID，以避免混淆。
+
+@example
+(define my-package
+  (let ((commit "c3f29bc928d5900971f65965feaae59e1272a3f7")
+        (revision "1"))          ;Guix软件包的revision
+    (package
+      (version (git-version "0.9" revision commit))
+      (source (origin
+                (method git-fetch)
+                (uri (git-reference
+                      (url "git://example.org/my-package.git")
+                      (commit commit)))
+                (sha256 (base32 "1mbikn@dots{}"))
+                (file-name (git-file-name name version))))
+      ;; @dots{}
+      )))
+@end example
+
+@node 简介和描述
+@subsection 简介和描述
+
+@cindex 软件包描述
+@cindex 软件包简介
+我们已经看到，GNU@tie{}Guix里的每个软件包都包含一个简介（synopsis）和一个描述
+（description）（@pxref{Defining Packages}）。简介和描述很重要：它们是
+@command{guix package --search}搜索的信息，并且是帮助用户决定一个软件包是否符合
+自己需求的重要信息。因此，打包的人应该关注怎样写它们的内容。
+
+简介必须以大写字母开头，并且不能以句号结尾。它们不能以 ``a'' 或者 ``the'' 等没有
+意义的词开头。例如 ``File-frobbing tool'' 要比 ``A tool that frobs files'' 更好。
+简介需要说明软件包是什么－－如 ``Core GNU utilities (file, text, shell)''，或者
+它的用途－－如 GNU@tie{}grep 的简介是 ``Print lines matching a pattern''。
+
+Keep in mind that the synopsis must be meaningful for a very wide audience.
+For example, ``Manipulate alignments in the SAM format'' might make sense
+for a seasoned bioinformatics researcher, but might be fairly unhelpful or
+even misleading to a non-specialized audience.  It is a good idea to come up
+with a synopsis that gives an idea of the application domain of the
+package.  In this example, this might give something like ``Manipulate
+nucleotide sequence alignments'', which hopefully gives the user a better
+idea of whether this is what they are looking for.
+
+Descriptions should take between five and ten lines.  Use full sentences,
+and avoid using acronyms without first introducing them.  Please avoid
+marketing phrases such as ``world-leading'', ``industrial-strength'', and
+``next-generation'', and avoid superlatives like ``the most
+advanced''---they are not helpful to users looking for a package and may
+even sound suspicious.  Instead, try to be factual, mentioning use cases and
+features.
+
+@cindex Texinfo markup, in package descriptions
+Descriptions can include Texinfo markup, which is useful to introduce
+ornaments such as @code{@@code} or @code{@@dfn}, bullet lists, or hyperlinks
+(@pxref{Overview,,, texinfo, GNU Texinfo}).  However you should be careful
+when using some characters for example @samp{@@} and curly braces which are
+the basic special characters in Texinfo (@pxref{Special Characters,,,
+texinfo, GNU Texinfo}).  User interfaces such as @command{guix package
+--show} take care of rendering it appropriately.
+
+Synopses and descriptions are translated by volunteers
+@uref{http://translationproject.org/domain/guix-packages.html, at the
+Translation Project} so that as many users as possible can read them in
+their native language.  User interfaces search them and display them in the
+language specified by the current locale.
+
+To allow @command{xgettext} to extract them as translatable strings,
+synopses and descriptions @emph{must be literal strings}.  This means that
+you cannot use @code{string-append} or @code{format} to construct these
+strings:
+
+@lisp
+(package
+  ;; @dots{}
+  (synopsis "This is translatable")
+  (description (string-append "This is " "*not*" " translatable.")))
+@end lisp
+
+Translation is a lot of work so, as a packager, please pay even more
+attention to your synopses and descriptions as every change may entail
+additional work for translators.  In order to help them, it is possible to
+make recommendations or instructions visible to them by inserting special
+comments like this (@pxref{xgettext Invocation,,, gettext, GNU Gettext}):
+
+@example
+;; TRANSLATORS: "X11 resize-and-rotate" should not be translated.
+(description "ARandR is designed to provide a simple visual front end
+for the X11 resize-and-rotate (RandR) extension. @dots{}")
+@end example
+
+
+@node Python模块
+@subsection Python模块
+
+@cindex python
+We currently package Python 2 and Python 3, under the Scheme variable names
+@code{python-2} and @code{python} as explained in @ref{版本号}.  To
+avoid confusion and naming clashes with other programming languages, it
+seems desirable that the name of a package for a Python module contains the
+word @code{python}.
+
+Some modules are compatible with only one version of Python, others with
+both.  If the package Foo compiles only with Python 3, we name it
+@code{python-foo}; if it compiles only with Python 2, we name it
+@code{python2-foo}. If it is compatible with both versions, we create two
+packages with the corresponding names.
+
+If a project already contains the word @code{python}, we drop this; for
+instance, the module python-dateutil is packaged under the names
+@code{python-dateutil} and @code{python2-dateutil}.  If the project name
+starts with @code{py} (e.g.@: @code{pytz}), we keep it and prefix it as
+described above.
+
+@subsubsection Specifying Dependencies
+@cindex inputs, for Python packages
+
+Dependency information for Python packages is usually available in the
+package source tree, with varying degrees of accuracy: in the
+@file{setup.py} file, in @file{requirements.txt}, or in @file{tox.ini}.
+
+Your mission, when writing a recipe for a Python package, is to map these
+dependencies to the appropriate type of ``input'' (@pxref{package Reference,
+inputs}).  Although the @code{pypi} importer normally does a good job
+(@pxref{Invoking guix import}), you may want to check the following check
+list to determine which dependency goes where.
+
+@itemize
+
+@item
+We currently package Python 2 with @code{setuptools} and @code{pip}
+installed like Python 3.4 has per default.  Thus you don't need to specify
+either of these as an input.  @command{guix lint} will warn you if you do.
+
+@item
+Python dependencies required at run time go into @code{propagated-inputs}.
+They are typically defined with the @code{install_requires} keyword in
+@file{setup.py}, or in the @file{requirements.txt} file.
+
+@item
+Python packages required only at build time---e.g., those listed with the
+@code{setup_requires} keyword in @file{setup.py}---or only for
+testing---e.g., those in @code{tests_require}---go into
+@code{native-inputs}.  The rationale is that (1) they do not need to be
+propagated because they are not needed at run time, and (2) in a
+cross-compilation context, it's the ``native'' input that we'd want.
+
+Examples are the @code{pytest}, @code{mock}, and @code{nose} test
+frameworks.  Of course if any of these packages is also required at
+run-time, it needs to go to @code{propagated-inputs}.
+
+@item
+Anything that does not fall in the previous categories goes to
+@code{inputs}, for example programs or C libraries required for building
+Python packages containing C extensions.
+
+@item
+If a Python package has optional dependencies (@code{extras_require}), it is
+up to you to decide whether to add them or not, based on their
+usefulness/overhead ratio (@pxref{提交补丁, @command{guix size}}).
+
+@end itemize
+
+
+@node Perl模块
+@subsection Perl模块
+
+@cindex perl
+Perl programs standing for themselves are named as any other package, using
+the lowercase upstream name.  For Perl packages containing a single class,
+we use the lowercase class name, replace all occurrences of @code{::} by
+dashes and prepend the prefix @code{perl-}.  So the class @code{XML::Parser}
+becomes @code{perl-xml-parser}.  Modules containing several classes keep
+their lowercase upstream name and are also prepended by @code{perl-}.  Such
+modules tend to have the word @code{perl} somewhere in their name, which
+gets dropped in favor of the prefix.  For instance, @code{libwww-perl}
+becomes @code{perl-libwww}.
+
+
+@node Java包
+@subsection Java包
+
+@cindex java
+Java programs standing for themselves are named as any other package, using
+the lowercase upstream name.
+
+To avoid confusion and naming clashes with other programming languages, it
+is desirable that the name of a package for a Java package is prefixed with
+@code{java-}.  If a project already contains the word @code{java}, we drop
+this; for instance, the package @code{ngsjava} is packaged under the name
+@code{java-ngs}.
+
+For Java packages containing a single class or a small class hierarchy, we
+use the lowercase class name, replace all occurrences of @code{.} by dashes
+and prepend the prefix @code{java-}.  So the class @code{apache.commons.cli}
+becomes package @code{java-apache-commons-cli}.
+
+
+@node 字体
+@subsection 字体
+
+@cindex fonts
+For fonts that are in general not installed by a user for typesetting
+purposes, or that are distributed as part of a larger software package, we
+rely on the general packaging rules for software; for instance, this applies
+to the fonts delivered as part of the X.Org system or fonts that are part of
+TeX Live.
+
+To make it easier for a user to search for fonts, names for other packages
+containing only fonts are constructed as follows, independently of the
+upstream package name.
+
+The name of a package containing only one font family starts with
+@code{font-}; it is followed by the foundry name and a dash @code{-} if the
+foundry is known, and the font family name, in which spaces are replaced by
+dashes (and as usual, all upper case letters are transformed to lower
+case).  For example, the Gentium font family by SIL is packaged under the
+name @code{font-sil-gentium}.
+
+For a package containing several font families, the name of the collection
+is used in the place of the font family name.  For instance, the Liberation
+fonts consist of three families, Liberation Sans, Liberation Serif and
+Liberation Mono.  These could be packaged separately under the names
+@code{font-liberation-sans} and so on; but as they are distributed together
+under a common name, we prefer to package them together as
+@code{font-liberation}.
+
+In the case where several formats of the same font family or font collection
+are packaged separately, a short form of the format, prepended by a dash, is
+added to the package name.  We use @code{-ttf} for TrueType fonts,
+@code{-otf} for OpenType fonts and @code{-type1} for PostScript Type 1
+fonts.
+
+
+@node 代码风格
+@section 代码风格
+
+In general our code follows the GNU Coding Standards (@pxref{Top,,,
+standards, GNU Coding Standards}).  However, they do not say much about
+Scheme, so here are some additional rules.
+
+@menu
+* Programming Paradigm::     How to compose your elements.
+* Modules::                  Where to store your code?
+* Data Types and Pattern Matching::  Implementing data structures.
+* Formatting Code::          Writing conventions.
+@end menu
+
+@node Programming Paradigm
+@subsection Programming Paradigm
+
+Scheme code in Guix is written in a purely functional style.  One exception
+is code that involves input/output, and procedures that implement low-level
+concepts, such as the @code{memoize} procedure.
+
+@node Modules
+@subsection Modules
+
+Guile modules that are meant to be used on the builder side must live in the
+@code{(guix build @dots{})} name space.  They must not refer to other Guix
+or GNU modules.  However, it is OK for a ``host-side'' module to use a
+build-side module.
+
+Modules that deal with the broader GNU system should be in the @code{(gnu
+@dots{})} name space rather than @code{(guix @dots{})}.
+
+@node Data Types and Pattern Matching
+@subsection Data Types and Pattern Matching
+
+The tendency in classical Lisp is to use lists to represent everything, and
+then to browse them ``by hand'' using @code{car}, @code{cdr}, @code{cadr},
+and co.  There are several problems with that style, notably the fact that
+it is hard to read, error-prone, and a hindrance to proper type error
+reports.
+
+Guix code should define appropriate data types (for instance, using
+@code{define-record-type*}) rather than abuse lists.  In addition, it should
+use pattern matching, via Guile’s @code{(ice-9 match)} module, especially
+when matching lists.
+
+@node Formatting Code
+@subsection Formatting Code
+
+@cindex formatting code
+@cindex coding style
+When writing Scheme code, we follow common wisdom among Scheme programmers.
+In general, we follow the @url{http://mumble.net/~campbell/scheme/style.txt,
+Riastradh's Lisp Style Rules}.  This document happens to describe the
+conventions mostly used in Guile’s code too.  It is very thoughtful and well
+written, so please do read it.
+
+Some special forms introduced in Guix, such as the @code{substitute*} macro,
+have special indentation rules.  These are defined in the
+@file{.dir-locals.el} file, which Emacs automatically uses.  Also note that
+Emacs-Guix provides @code{guix-devel-mode} mode that indents and highlights
+Guix code properly (@pxref{Development,,, emacs-guix, The Emacs-Guix
+Reference Manual}).
+
+@cindex indentation, of code
+@cindex formatting, of code
+If you do not use Emacs, please make sure to let your editor knows these
+rules.  To automatically indent a package definition, you can also run:
+
+@example
+./etc/indent-code.el gnu/packages/@var{file}.scm @var{package}
+@end example
+
+@noindent
+This automatically indents the definition of @var{package} in
+@file{gnu/packages/@var{file}.scm} by running Emacs in batch mode.  To
+indent a whole file, omit the second argument:
+
+@example
+./etc/indent-code.el gnu/services/@var{file}.scm
+@end example
+
+@cindex Vim, Scheme code editing
+If you are editing code with Vim, we recommend that you run @code{:set
+autoindent} so that your code is automatically indented as you type.
+Additionally, @uref{https://www.vim.org/scripts/script.php?script_id=3998,
+@code{paredit.vim}} may help you deal with all these parentheses.
+
+We require all top-level procedures to carry a docstring.  This requirement
+can be relaxed for simple private procedures in the @code{(guix build
+@dots{})} name space, though.
+
+Procedures should not have more than four positional parameters.  Use
+keyword parameters for procedures that take more than four parameters.
+
+
+@node 提交补丁
+@section 提交补丁
+
+Development is done using the Git distributed version control system.  Thus,
+access to the repository is not strictly necessary.  We welcome
+contributions in the form of patches as produced by @code{git format-patch}
+sent to the @email{guix-patches@@gnu.org} mailing list.
+
+This mailing list is backed by a Debbugs instance accessible at
+@uref{https://bugs.gnu.org/guix-patches}, which allows us to keep track of
+submissions.  Each message sent to that mailing list gets a new tracking
+number assigned; people can then follow up on the submission by sending
+email to @code{@var{NNN}@@debbugs.gnu.org}, where @var{NNN} is the tracking
+number (@pxref{Sending a Patch Series}).
+
+Please write commit logs in the ChangeLog format (@pxref{Change Logs,,,
+standards, GNU Coding Standards}); you can check the commit history for
+examples.
+
+Before submitting a patch that adds or modifies a package definition, please
+run through this check list:
+
+@enumerate
+@item
+If the authors of the packaged software provide a cryptographic signature
+for the release tarball, make an effort to verify the authenticity of the
+archive.  For a detached GPG signature file this would be done with the
+@code{gpg --verify} command.
+
+@item
+Take some time to provide an adequate synopsis and description for the
+package.  @xref{简介和描述}, for some guidelines.
+
+@item
+Run @code{guix lint @var{package}}, where @var{package} is the name of the
+new or modified package, and fix any errors it reports (@pxref{Invoking guix
+lint}).
+
+@item
+Make sure the package builds on your platform, using @code{guix build
+@var{package}}.
+
+@item
+We recommend you also try building the package on other supported
+platforms.  As you may not have access to actual hardware platforms, we
+recommend using the @code{qemu-binfmt-service-type} to emulate them.  In
+order to enable it, add the following service to the list of services in
+your @code{operating-system} configuration:
+
+@example
+(service qemu-binfmt-service-type
+ (qemu-binfmt-configuration
+   (platforms (lookup-qemu-platforms "arm" "aarch64" "mips64el"))
+   (guix-support? #t)))
+@end example
+
+Then reconfigure your system.
+
+You can then build packages for different platforms by specifying the
+@code{--system} option.  For example, to build the "hello" package for the
+armhf, aarch64, or mips64 architectures, you would run the following
+commands, respectively:
+@example
+guix build --system=armhf-linux --rounds=2 hello
+guix build --system=aarch64-linux --rounds=2 hello
+guix build --system=mips64el-linux --rounds=2 hello
+@end example
+
+@item
+@cindex bundling
+Make sure the package does not use bundled copies of software already
+available as separate packages.
+
+Sometimes, packages include copies of the source code of their dependencies
+as a convenience for users.  However, as a distribution, we want to make
+sure that such packages end up using the copy we already have in the
+distribution, if there is one.  This improves resource usage (the dependency
+is built and stored only once), and allows the distribution to make
+transverse changes such as applying security updates for a given software
+package in a single place and have them affect the whole system---something
+that bundled copies prevent.
+
+@item
+Take a look at the profile reported by @command{guix size} (@pxref{Invoking
+guix size}).  This will allow you to notice references to other packages
+unwillingly retained.  It may also help determine whether to split the
+package (@pxref{Packages with Multiple Outputs}), and which optional
+dependencies should be used.  In particular, avoid adding @code{texlive} as
+a dependency: because of its extreme size, use @code{texlive-tiny} or
+@code{texlive-union} instead.
+
+@item
+For important changes, check that dependent package (if applicable) are not
+affected by the change; @code{guix refresh --list-dependent @var{package}}
+will help you do that (@pxref{Invoking guix refresh}).
+
+@c See <https://lists.gnu.org/archive/html/guix-devel/2016-10/msg00933.html>.
+@cindex branching strategy
+@cindex rebuild scheduling strategy
+Depending on the number of dependent packages and thus the amount of
+rebuilding induced, commits go to different branches, along these lines:
+
+@table @asis
+@item 300 dependent packages or less
+@code{master} branch (non-disruptive changes).
+
+@item between 300 and 1,200 dependent packages
+@code{staging} branch (non-disruptive changes).  This branch is intended to
+be merged in @code{master} every 3 weeks or so.  Topical changes (e.g., an
+update of the GNOME stack) can instead go to a specific branch (say,
+@code{gnome-updates}).
+
+@item more than 1,200 dependent packages
+@code{core-updates} branch (may include major and potentially disruptive
+changes).  This branch is intended to be merged in @code{master} every 2.5
+months or so.
+@end table
+
+All these branches are @uref{https://hydra.gnu.org/project/gnu, tracked by
+our build farm} and merged into @code{master} once everything has been
+successfully built.  This allows us to fix issues before they hit users, and
+to reduce the window during which pre-built binaries are not available.
+
+@c TODO: It would be good with badges on the website that tracks these
+@c branches.  Or maybe even a status page.
+Generally, branches other than @code{master} are considered @emph{frozen} if
+there has been a recent evaluation, or there is a corresponding @code{-next}
+branch.  Please ask on the mailing list or IRC if unsure where to place a
+patch.
+
+@item
+@cindex determinism, of build processes
+@cindex reproducible builds, checking
+Check whether the package's build process is deterministic.  This typically
+means checking whether an independent build of the package yields the exact
+same result that you obtained, bit for bit.
+
+A simple way to do that is by building the same package several times in a
+row on your machine (@pxref{Invoking guix build}):
+
+@example
+guix build --rounds=2 my-package
+@end example
+
+This is enough to catch a class of common non-determinism issues, such as
+timestamps or randomly-generated output in the build result.
+
+Another option is to use @command{guix challenge} (@pxref{Invoking guix
+challenge}).  You may run it once the package has been committed and built
+by @code{@value{SUBSTITUTE-SERVER}} to check whether it obtains the same
+result as you did.  Better yet: Find another machine that can build it and
+run @command{guix publish}.  Since the remote build machine is likely
+different from yours, this can catch non-determinism issues related to the
+hardware---e.g., use of different instruction set extensions---or to the
+operating system kernel---e.g., reliance on @code{uname} or @file{/proc}
+files.
+
+@item
+When writing documentation, please use gender-neutral wording when referring
+to people, such as @uref{https://en.wikipedia.org/wiki/Singular_they,
+singular ``they''@comma{} ``their''@comma{} ``them''}, and so forth.
+
+@item
+Verify that your patch contains only one set of related changes.  Bundling
+unrelated changes together makes reviewing harder and slower.
+
+Examples of unrelated changes include the addition of several packages, or a
+package update along with fixes to that package.
+
+@item
+Please follow our code formatting rules, possibly running the
+@command{etc/indent-code.el} script to do that automatically for you
+(@pxref{Formatting Code}).
+
+@item
+When possible, use mirrors in the source URL (@pxref{Invoking guix
+download}).  Use reliable URLs, not generated ones.  For instance, GitHub
+archives are not necessarily identical from one generation to the next, so
+in this case it's often better to clone the repository.  Don't use the
+@command{name} field in the URL: it is not very useful and if the name
+changes, the URL will probably be wrong.
+
+@end enumerate
+
+When posting a patch to the mailing list, use @samp{[PATCH] @dots{}} as a
+subject.  You may use your email client or the @command{git send-email}
+command (@pxref{Sending a Patch Series}).  We prefer to get patches in plain
+text messages, either inline or as MIME attachments.  You are advised to pay
+attention if your email client changes anything like line breaks or
+indentation which could potentially break the patches.
+
+When a bug is resolved, please close the thread by sending an email to
+@email{@var{NNN}-done@@debbugs.gnu.org}.
+
+@unnumberedsubsec Sending a Patch Series
+@anchor{Sending a Patch Series}
+@cindex patch series
+@cindex @code{git send-email}
+@cindex @code{git-send-email}
+
+@c Debbugs bug: https://debbugs.gnu.org/db/15/15361.html
+When sending a patch series (e.g., using @code{git send-email}), please
+first send one message to @email{guix-patches@@gnu.org}, and then send
+subsequent patches to @email{@var{NNN}@@debbugs.gnu.org} to make sure they
+are kept together.  See @uref{https://debbugs.gnu.org/Advanced.html, the
+Debbugs documentation} for more information.