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diff --git a/chapter06/bison.xml b/chapter06/bison.xml
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--- a/chapter06/bison.xml
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@@ -1,142 +0,0 @@
-<?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-bison" role="wrap">
-  <?dbhtml filename="bison.html"?>
-
-  <sect1info condition="script">
-    <productname>bison</productname>
-    <productnumber>&bison-version;</productnumber>
-    <address>&bison-url;</address>
-  </sect1info>
-
-  <title>Bison-&bison-version;</title>
-
-  <indexterm zone="ch-system-bison">
-    <primary sortas="a-Bison">Bison</primary>
-  </indexterm>
-
-  <sect2 role="package">
-    <title/>
-
-    <para>The Bison package contains a parser generator.</para>
-
-    <segmentedlist>
-      <segtitle>&buildtime;</segtitle>
-      <segtitle>&diskspace;</segtitle>
-
-      <seglistitem>
-        <seg>&bison-ch6-sbu;</seg>
-        <seg>&bison-ch6-du;</seg>
-      </seglistitem>
-    </segmentedlist>
-
-  </sect2>
-
-  <sect2 role="installation">
-    <title>Installation of Bison</title>
-<!--
-    <para>First, fix a build problem with the current version:</para>
-
-<screen><userinput remap="pre">sed -i '9327 s/mv/cp/' Makefile.in</userinput></screen>
--->
-    <para>Prepare Bison for compilation:</para>
-
-<screen><userinput remap="configure">./configure --prefix=/usr --docdir=/usr/share/doc/bison-&bison-version;</userinput></screen>
-
-<!--  I could not find a race condidtion in the current version.
-    <para>Compile the package, but work around a race condition in the 
-    current version:</para>
-
-<screen><userinput remap="make">make -j1</userinput></screen>-->
-
-    <para>Compile the package:</para>
-
-<screen><userinput remap="make">make</userinput></screen>
-
-    <para>To test the results (about 5.5 SBU), issue:</para>
-
-<screen><userinput remap="test">make check</userinput></screen>
-
-    <para>Fourteen tests fail in the "Diagnostics" section, probably because of
-    missing locales.</para>
-
-<!--
-    <para>There is a circular dependency between bison and flex with regard to
-    the checks.  If desired, after installing flex in the next section, the
-    bison package can be rebuilt and the bison checks can be run with 
-    <command>make check</command>.</para>
--->
-
-    <para>Install the package:</para>
-
-<screen><userinput remap="install">make install</userinput></screen>
-
-  </sect2>
-
-  <sect2 id="contents-bison" role="content">
-    <title>Contents of Bison</title>
-
-    <segmentedlist>
-      <segtitle>Installed programs</segtitle>
-      <segtitle>Installed library</segtitle>
-      <segtitle>Installed directory</segtitle>
-
-      <seglistitem>
-        <seg>bison and yacc</seg>
-        <seg>liby.a</seg>
-        <seg>/usr/share/bison</seg>
-      </seglistitem>
-    </segmentedlist>
-
-    <variablelist>
-      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
-      <?dbfo list-presentation="list"?>
-      <?dbhtml list-presentation="table"?>
-
-      <varlistentry id="bison">
-        <term><command>bison</command></term>
-        <listitem>
-          <para>Generates, from a series of rules, a program for analyzing the
-          structure of text files; Bison is a replacement for Yacc (Yet Another
-          Compiler Compiler)</para>
-          <indexterm zone="ch-system-bison bison">
-            <primary sortas="b-bison">bison</primary>
-          </indexterm>
-        </listitem>
-      </varlistentry>
-
-      <varlistentry id="yacc">
-        <term><command>yacc</command></term>
-        <listitem>
-          <para>A wrapper for <command>bison</command>, meant for programs that
-          still call <command>yacc</command> instead of <command>bison</command>;
-          it calls <command>bison</command> with the <parameter>-y</parameter>
-          option</para>
-          <indexterm zone="ch-system-bison yacc">
-            <primary sortas="b-yacc">yacc</primary>
-          </indexterm>
-        </listitem>
-      </varlistentry>
-
-      <varlistentry id="liby">
-        <term><filename class="libraryfile">liby</filename></term>
-        <listitem>
-          <para>The Yacc library containing implementations of Yacc-compatible
-          <function>yyerror</function> and <function>main</function> functions;
-          this library is normally not very useful, but POSIX requires it</para>
-          <indexterm zone="ch-system-bison liby">
-            <primary sortas="c-liby">liby</primary>
-          </indexterm>
-        </listitem>
-      </varlistentry>
-
-    </variablelist>
-
-  </sect2>
-
-</sect1>