source: downloads/boost_1_33_1/tools/boostbook/xsl/dtd/dtd2boostbook.xsl @ 12

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  <xsl:key name="elements" match="element" use="@name"/>
  <xsl:key name="attributes" match="attlist" use="@name"/>
  <xsl:key name="attribute-purposes" match="attpurpose" use="@name"/>

  <xsl:template match="dtd">
    <section id="reference">
      <title>Reference</title>
      <para>
        <xsl:text>Elements:</xsl:text>
        <itemizedlist spacing="compact">
          <xsl:apply-templates select="element" mode="synopsis">
            <xsl:sort select="@name"/>
          </xsl:apply-templates>
        </itemizedlist>
      </para>
      <xsl:apply-templates select="element"/>
    </section>
  </xsl:template>

  <!-- Element synopsis -->
  <xsl:template match="element" mode="synopsis">
    <listitem>
      <simpara>
        <link>
          <xsl:attribute name="linkend">
            <xsl:value-of select="concat('boostbook.dtd.',@name)"/>
          </xsl:attribute>
          <xsl:text>Element </xsl:text>
          <sgmltag><xsl:value-of select="@name"/></sgmltag>
          <xsl:text> - </xsl:text>
          <xsl:apply-templates select="purpose"/>
        </link>
      </simpara>
    </listitem>
  </xsl:template>

  <!-- Elements are transformed into DocBook refentry elements -->
  <xsl:template match="element">
    <refentry>
      <xsl:attribute name="id">
        <xsl:value-of select="concat('boostbook.dtd.',@name)"/>
      </xsl:attribute>

      <refmeta>
        <refentrytitle>
          BoostBook element <sgmltag><xsl:value-of select="@name"/></sgmltag>
        </refentrytitle>
        <manvolnum>9</manvolnum>
      </refmeta>
      <refnamediv>
        <refname><xsl:value-of select="@name"/></refname>
        <refpurpose><xsl:apply-templates select="purpose"/></refpurpose>
      </refnamediv>
      <refsynopsisdiv>
        <xsl:value-of select="@name"/><xsl:text> ::= </xsl:text>
        <xsl:apply-templates select="content-model-expanded"/>
      </refsynopsisdiv>
      <xsl:apply-templates select="description"/>
      <xsl:apply-templates select="key('attributes', @name)"/>
    </refentry>
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    <xsl:apply-templates/>
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    <xsl:text>)</xsl:text>
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    <xsl:text>)</xsl:text>
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      <xsl:value-of select="$separator"/>
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    <xsl:variable name="element-node" select="key('elements', @name)"/>

    <xsl:choose>
      <xsl:when test="$element-node">
        <link>
          <xsl:attribute name="linkend">
            <xsl:value-of select="concat('boostbook.dtd.',@name)"/>
          </xsl:attribute>
          <xsl:value-of select="@name"/>
        </link>
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        <xsl:value-of select="@name"/>
      </xsl:otherwise>
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  <!-- Just copy anything in a purpose element -->
  <xsl:template match="purpose">
    <xsl:copy-of select="text()|*"/>
  </xsl:template>

  <!-- Just copy anything in a description element, but place it in a
       section. -->
  <xsl:template match="description">
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      <title>Description</title>
      <xsl:copy-of select="text()|*"/>
    </refsection>
  </xsl:template>

  <!-- Attributes -->
  <xsl:template match="attlist">
    <refsection>
      <title>Attributes</title>
      
      <informaltable>
        <tgroup cols="4">
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              <entry>Name</entry>
              <entry>Type</entry>
              <entry>Value</entry>
              <entry>Purpose</entry>
            </row>
          </thead>
          <tbody>
            <xsl:apply-templates/>
          </tbody>
        </tgroup>
      </informaltable>
    </refsection>
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  <!-- Attribute -->
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