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-<chapter xmlns="http://docbook.org/ns/docbook"
-      xmlns:xlink="http://www.w3.org/1999/xlink"
-      xmlns:xi="http://www.w3.org/2001/XInclude"
-      version="5.0"
-      xml:id="ch-simple-expression">
-
-<title>A Simple Nix Expression</title>
-
-<para>This section shows how to add and test the <link
-xlink:href='http://www.gnu.org/software/hello/hello.html'>GNU Hello
-package</link> to the Nix Packages collection.  Hello is a program
-that prints out the text <quote>Hello, world!</quote>.</para>
-
-<para>To add a package to the Nix Packages collection, you generally
-need to do three things:
-
-<orderedlist>
-
-  <listitem><para>Write a Nix expression for the package.  This is a
-  file that describes all the inputs involved in building the package,
-  such as dependencies, sources, and so on.</para></listitem>
-
-  <listitem><para>Write a <emphasis>builder</emphasis>.  This is a
-  shell script<footnote><para>In fact, it can be written in any
-  language, but typically it's a <command>bash</command> shell
-  script.</para></footnote> that actually builds the package from
-  the inputs.</para></listitem>
-
-  <listitem><para>Add the package to the file
-  <filename>pkgs/top-level/all-packages.nix</filename>.  The Nix
-  expression written in the first step is a
-  <emphasis>function</emphasis>; it requires other packages in order
-  to build it.  In this step you put it all together, i.e., you call
-  the function with the right arguments to build the actual
-  package.</para></listitem>
-
-</orderedlist>
-
-</para>
-
-<xi:include href="expression-syntax.xml" />
-<xi:include href="build-script.xml" />
-<xi:include href="arguments-variables.xml" />
-<xi:include href="simple-building-testing.xml" />
-<xi:include href="generic-builder.xml" />
-
-</chapter>