Add wheel.xml

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diff --git a/chapter08/wheel.xml b/chapter08/wheel.xml
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+<?xml version="1.0" encoding="ISO-8859-1"?>
+<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
+  <!ENTITY % general-entities SYSTEM "../general.ent">
+  %general-entities;
+]>
+
+<sect1 id="ch-system-wheel" role="wrap">
+  <?dbhtml filename="wheel.html"?>
+
+  <sect1info condition="script">
+    <productname>wheel</productname>
+    <productnumber>&wheel-version;</productnumber>
+    <address>&wheel-url;</address>
+  </sect1info>
+
+  <title>wheel-&wheel-version;</title>
+
+  <indexterm zone="ch-system-wheel">
+    <primary sortas="a-wheel">wheel</primary>
+  </indexterm>
+
+  <sect2 role="package">
+    <title/>
+
+    <para>Wheel is a Python library that implements the reference
+    implementation of the Python wheel packaging standard.</para>
+
+    <segmentedlist>
+      <segtitle>&buildtime;</segtitle>
+      <segtitle>&diskspace;</segtitle>
+      <seglistitem>
+        <seg>&wheel-fin-sbu;</seg>
+        <seg>&wheel-fin-du;</seg>
+      </seglistitem>
+    </segmentedlist>
+
+  </sect2>
+
+  <sect2 role="installation">
+    <title>Installation of Wheel</title>
+
+    <para>Install wheel with the following command:</para>
+
+<screen><userinput remap="install">pip3 install --no-index $PWD</userinput></screen>
+
+    <variablelist>
+      <title>The meaning of the pip3 options:</title>
+
+      <varlistentry>
+        <term><command>install</command></term>
+        <listitem>
+           <para>Install the package</para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><parameter>--no-index</parameter></term>
+        <listitem>
+          <para>Prevent pip from fetching files from the online package
+          repository (PyPI). If packages are installed in the correct order,
+          then it won't need to fetch any files in the first place, but this
+          option adds some safety in case of user error.</para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><parameter>$PWD</parameter></term>
+        <listitem>
+           <para>Look for files to install in the current working directory.</para>
+        </listitem>
+      </varlistentry>
+
+    </variablelist>
+
+  </sect2>
+
+  <sect2 id="contents-wheel" role="content">
+    <title>Contents of Wheel</title>
+
+    <segmentedlist>
+      <segtitle>Installed module</segtitle>
+      <segtitle>Installed directory</segtitle>
+
+      <seglistitem>
+        <seg>wheel.py</seg>
+        <seg>/usr/lib/python&python-minor;/site-packages/wheel</seg>
+      </seglistitem>
+
+    </segmentedlist>
+
+  </sect2>
+
+</sect1>
+