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diff --git a/stylesheets/lfs-xsl/docbook-xsl-1.78.1/common/pi.xml b/stylesheets/lfs-xsl/docbook-xsl-1.78.1/common/pi.xml
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index 64efdcae7..000000000
--- a/stylesheets/lfs-xsl/docbook-xsl-1.78.1/common/pi.xml
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@@ -1,168 +0,0 @@
-<?xml version="1.0"?>
-
-<reference><info><title>Common Processing Instruction Reference</title>
-    <releaseinfo role="meta">
-      $Id: pi.xsl 8782 2010-07-27 21:15:17Z mzjn $
-    </releaseinfo>
-  </info>
-  <partintro xml:id="partintro">
-    <title>Introduction</title>
-    
-<para>This is generated reference documentation for all
-      user-specifiable processing instructions (PIs) in the
-      “common” part of the DocBook XSL stylesheets.
-      <note>
-        
-<para>You add these PIs at particular points in a document to
-          cause specific “exceptions” to formatting/output behavior. To
-          make global changes in formatting/output behavior across an
-          entire document, it’s better to do it by setting an
-          appropriate stylesheet parameter (if there is one).</para>
-
-      </note>
-    </para>
-
-  </partintro>
-
-<refentry xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="dbchoice_choice">
-<refnamediv>
-<refname>dbchoice_choice</refname>
-<refpurpose>Generates a localized choice separator</refpurpose>
-</refnamediv>
-<refsynopsisdiv>
-
-    <synopsis><tag class="xmlpi">dbchoice choice="and"|"or"|<replaceable>string</replaceable>"</tag></synopsis>
-  
-</refsynopsisdiv>
-<refsect1><title>Description</title>
-    
-<para>Use the <tag class="xmlpi">dbchoice choice</tag> PI to
-      generate an appropriate localized “choice” separator (for
-      example, <literal>and</literal> or <literal>or</literal>)
-      before the final item in an inline <tag>simplelist</tag></para>
-
-    <warning>
-      
-<para>This PI is a less-than-ideal hack; support for it may
-        disappear in the future (particularly if and when a more
-        appropriate means for marking up "choice" lists becomes
-        available in DocBook).</para>
-
-    </warning>
-  </refsect1><refsect1><title>Parameters</title>
-    
-<variablelist>
-      <varlistentry><term>choice="and"</term>
-        <listitem>
-          
-<para>generates a localized <literal>and</literal> separator</para>
-
-        </listitem>
-      </varlistentry>
-      <varlistentry><term>choice="or"</term>
-        <listitem>
-          
-<para>generates a localized <literal>or</literal> separator</para>
-
-        </listitem>
-      </varlistentry>
-      <varlistentry><term>choice="<replaceable>string</replaceable>"</term>
-        <listitem>
-          
-<para>generates a literal <replaceable>string</replaceable> separator</para>
-
-        </listitem>
-      </varlistentry>
-    </variablelist>
-
-  </refsect1></refentry>
-
-<refentry xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="dbtimestamp">
-<refnamediv>
-<refname>dbtimestamp</refname>
-<refpurpose>Inserts a date timestamp</refpurpose>
-</refnamediv>
-<refsynopsisdiv>
-
-    <synopsis><tag class="xmlpi">dbtimestamp format="<replaceable>formatstring</replaceable>" [padding="0"|"1"]</tag></synopsis>
-  
-</refsynopsisdiv>
-<refsect1><title>Description</title>
-    
-<para>Use the <tag class="xmlpi">dbtimestamp</tag> PI at any point in a
-      source document to cause a date timestamp (a formatted
-      string representing the current date and time) to be
-      inserted in output of the document.</para>
-
-  </refsect1><refsect1><title>Parameters</title>
-    
-<variablelist>
-      <varlistentry><term>format="<replaceable>formatstring</replaceable>"</term>
-        <listitem>
-          
-<para>Specifies format in which the date and time are
-            output</para>
-
-        <note>
-          
-<para>For details of the content of the format string,
-            see <link role="tcg" xlink:href="Datetime.html">Date and time</link>.</para>
-
-        </note>
-        </listitem>
-      </varlistentry>
-      <varlistentry><term>padding="0"|"1"</term>
-        <listitem>
-          
-<para>Specifies padding behavior; if non-zero, padding is is added</para>
-
-        </listitem>
-      </varlistentry>
-    </variablelist>
-
-  </refsect1></refentry>
-
-<refentry xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="dbtex_delims">
-<refnamediv>
-<refname>dbtex_delims</refname>
-<refpurpose>Generates delimiters around embedded TeX equations
-    in output</refpurpose>
-</refnamediv>
-<refsynopsisdiv>
-
-    <synopsis><tag class="xmlpi">dbtex delims="no"|"yes"</tag></synopsis>
-  
-</refsynopsisdiv>
-<refsect1><title>Description</title>
-    
-<para>Use the <tag class="xmlpi">dbtex delims</tag> PI as a
-      child of a <tag>textobject</tag> containing embedded TeX
-      markup, to cause that markup to be surrounded by
-      <literal>$</literal> delimiter characters in output.</para>
-
-      <warning>
-       
-<para>This feature is useful for print/PDF output only if you
-       use the obsolete and now unsupported PassiveTeX XSL-FO
-       engine.</para>
-
-      </warning>
-  </refsect1><refsect1><title>Parameters</title>
-    
-<variablelist>
-      <varlistentry><term>dbtex delims="no"|"yes"</term>
-        <listitem>
-          
-<para>Specifies whether delimiters are output</para>
-
-        </listitem>
-      </varlistentry>
-    </variablelist>
-
-  </refsect1><refsect1 role="params"><title>Related Global Parameters</title>
-    
-<para><parameter>tex.math.delims</parameter></para>
-
-  </refsect1></refentry>
-</reference>
-