nixpkgs/doc/manual/options-to-docbook.xsl

<?xml version="1.0"?>

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                xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                xmlns:str="http://exslt.org/strings"
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                xmlns="http://docbook.org/ns/docbook"
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  <xsl:output method='xml' encoding="UTF-8" />

  
  <xsl:template match="/expr/list">

    <chapter xml:id="ch-options">
      <title>List of Options</title>

      <variablelist>

        <xsl:for-each select="attrs">

          <varlistentry>
             <term>
               <option>
                 <xsl:for-each select="attr[@name = 'name']/string">
                   <xsl:value-of select="@value" />
		   <xsl:if test="position() != last()">.</xsl:if>
                 </xsl:for-each>
               </option>
             </term>

             <listitem>

               <para>
                 <xsl:value-of disable-output-escaping="yes"
                               select="attr[@name = 'description']/string/@value" />
               </para>

               <para>
                 <emphasis>Default:</emphasis>
                 <xsl:choose>
                   <xsl:when test="attr[@name = 'default']">
                     <literal>
                       <xsl:apply-templates select="attr[@name = 'default']" />
                     </literal>
                   </xsl:when>
                   <xsl:otherwise>
                     none
                   </xsl:otherwise>
                 </xsl:choose>
               </para>

               <xsl:if test="attr[@name = 'example']">
                 <para>
                   <emphasis>Example:</emphasis>
                   <literal>
                     <xsl:apply-templates select="attr[@name = 'example']" />
                   </literal>
                 </para>
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             </listitem>

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      </variablelist>

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  <xsl:template match="int">
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  <xsl:template match="bool[@value = 'true']">
    true
  </xsl:template>
  
  
  <xsl:template match="bool[@value = 'false']">
    false
  </xsl:template>
  
  
  <xsl:template match="list">
    [
    <xsl:for-each select="*">
      <xsl:apply-templates select="." />
      <xsl:text> </xsl:text>
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  <xsl:template match="attrs">
    {
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      <xsl:text> = </xsl:text>
      <xsl:apply-templates select="*" />
      <xsl:text>; </xsl:text>
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  </xsl:template>
  
  
  <xsl:template match="derivation">
    <xsl:choose>
      <xsl:when test="attr[@name = 'url']/string/@value">
        <emphasis>(download of <xsl:value-of select="attr[@name = 'url']/string/@value" />)</emphasis>
      </xsl:when>
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        <emphasis>(build of <xsl:value-of select="attr[@name = 'name']/string/@value" />)</emphasis>
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