Subversion Repositories openrisc

<section xmlns="http://docbook.org/ns/docbook" version="5.0" 
         xml:id="appendix.porting.doc" xreflabel="Documentation Hacking">
<?dbhtml filename="documentation_hacking.html"?>

<info><title>Writing and Generating Documentation</title>
  <keywordset>
    <keyword>ISO C++</keyword>
    <keyword>documentation</keyword>
    <keyword>style</keyword>
    <keyword>docbook</keyword>
    <keyword>doxygen</keyword>
  </keywordset>
</info>

  <section xml:id="doc.intro">
    <info>
    <title>Introduction</title>
    </info>
    <para>
      Documentation for the GNU C++ Library is created from three
      independent sources: a manual, a FAQ, and an API reference.
    </para>
    <para>
      The sub-directory <filename class="directory">doc</filename>
      within the main source directory contains
      <filename>Makefile.am</filename> and
      <filename>Makefile.in</filename>, which provide rules for
      generating documentation, described in excruciating detail
      below. The <filename class="directory">doc</filename>
      sub-directory also contains three directories: <filename
      class="directory">doxygen</filename>, which contains scripts and
      fragments for <command>doxygen</command>, <filename
      class="directory">html</filename>, which contains an html
      version of the manual, and <filename
      class="directory">xml</filename>, which contains an xml version
      of the manual.
    </para>
    <para>
      Diverging from established documentation conventions in the rest
      of the GCC project, libstdc++ does not use Texinfo as a markup
      language. Instead, Docbook is used to create the manual and the
      FAQ, and Doxygen is used to construct the API
      reference. Although divergent, this conforms to the GNU Project
      recommendations as long as the output is of sufficient quality,
      as per
      <link xmlns:xlink="http://www.w3.org/1999/xlink" 
      xlink:href="http://www.gnu.org/prep/standards/standards.html#Documentation">
      GNU Manuals</link>.
    </para>
  </section>

  <section xml:id="doc.generation">
    <info>
    <title>Generating Documentation</title>
    </info>
    
    <para>
      Certain Makefile rules are required by the GNU Coding
      Standards. These standard rules generate HTML, PDF, XML, or man
      files. For each of the generative rules, there is an additional
      install rule that is used to install any generated documentation
      files into the prescribed installation directory. Files are
      installed into <filename class="directory">share/doc</filename>
      or <filename class="directory">share/man</filename> directories.
    </para>

    <para>
      The standard Makefile rules are conditionally supported, based
      on the results of examining the host environment for
      prerequisites at configuration time. If requirements are not
      found, the rule is aliased to a dummy rule that does nothing,
      and produces no documentation. If the requirements are found,
      the rule forwards to a private rule that produces the requested
      documentation.
    </para>

    <para>
      For more details on what prerequisites were found and where,
      please consult the file <filename>config.log</filename> in the
      libstdc++ build directory. Compare this log to what is expected
      for the relevant Makefile conditionals:
      <literal>BUILD_INFO</literal>, <literal>BUILD_XML</literal>,
      <literal>BUILD_HTML</literal>, <literal>BUILD_MAN</literal>,
      <literal>BUILD_PDF</literal>, and <literal>BUILD_EPUB</literal>.
    </para>

    <para>
      Supported Makefile rules:
    </para>

    <variablelist>
      <varlistentry>
        <term>
          <emphasis>make html</emphasis>
        </term>
        <term>
          <emphasis>make install-html</emphasis>
        </term>
        <listitem>
          <para>
            Generates multi-page HTML documentation, and installs it
            in the following directories:
          </para>
          <para>
            <filename class="directory">
              doc/libstdc++/libstdc++-api.html
            </filename>
          </para>
          <para>
            <filename class="directory">
              doc/libstdc++/libstdc++-manual.html
            </filename>
          </para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>
          <emphasis>make pdf</emphasis>
        </term>
        <term>
          <emphasis>make install-pdf</emphasis>
        </term>
        <listitem>
          <para>
            Generates indexed PDF documentation, and installs it as
            the following files:
          </para>
          <para>
            <filename>doc/libstdc++/libstdc++-api.pdf</filename>
          </para>
          <para>
            <filename>doc/libstdc++/libstdc++-manual.pdf</filename>
          </para>
        </listitem>
      </varlistentry>
      
      <varlistentry>
        <term>
          <emphasis>make man</emphasis>
        </term>
        <term>
          <emphasis>make install-man</emphasis>
        </term>
        <listitem>
          <para>
            Generates man pages, and installs it in the following directory:
          </para>
          <para>
            <filename class="directory">man/man3/</filename>
          </para>
          <para>
            The generated man pages are namespace-qualified, so to look at
            the man page for <classname>vector</classname>, one would use
            <command>man std::vector</command>.
          </para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>
          <emphasis>make epub</emphasis>
        </term>
        <term>
          <emphasis>make install-epub</emphasis>
        </term>
        <listitem>
          <para>
            Generates documentation in the ebook/portable electronic
            reader format called Epub, and installs it as the
            following file.
          </para>
          <para>
            <filename>doc/libstdc++/libstdc++-manual.epub</filename>
          </para>
        </listitem>
      </varlistentry>      

      <varlistentry>
        <term>
          <emphasis>make xml</emphasis>
        </term>
        <term>
          <emphasis>make install-xml</emphasis>
        </term>
        <listitem>
          <para>
            Generates single-file XML documentation, and installs it
            as the following files:
          </para>
          <para>
            <filename>doc/libstdc++/libstdc++-api-single.xml</filename>
          </para>
          <para>
            <filename>doc/libstdc++/libstdc++-manual-single.xml</filename>
          </para>
        </listitem>
      </varlistentry>
    </variablelist>

    <para>
      Makefile rules for several other formats are explicitly not
      supported, and are always aliased to dummy rules. These
      unsupported formats are: <emphasis>info</emphasis>,
      <emphasis>ps</emphasis>, and <emphasis>dvi</emphasis>.
    </para>
  </section>

  <section xml:id="doc.doxygen"><info><title>Doxygen</title></info>
    
    <section xml:id="doxygen.prereq"><info><title>Prerequisites</title></info>
      
 <table frame="all">
<title>Doxygen Prerequisites</title>

<tgroup cols="3" align="center" colsep="1" rowsep="1">
<colspec colname="c1"/>
<colspec colname="c2"/>
<colspec colname="c3"/>

  <thead>
    <row>
      <entry>Tool</entry>
      <entry>Version</entry>
      <entry>Required By</entry>
    </row>
  </thead>

  <tbody>

    <row>
      <entry>coreutils</entry>
      <entry>8.5</entry>
      <entry>all</entry>
    </row>

    <row>
      <entry>bash</entry>
      <entry>4.1</entry>
      <entry>all</entry>
    </row>

    <row>
      <entry>doxygen</entry>
      <entry>1.7.6.1</entry>
      <entry>all</entry>
    </row>

    <row>
      <entry>graphviz</entry>
      <entry>2.26</entry>
      <entry>graphical hierarchies</entry>
    </row>

    <row>
      <entry>pdflatex</entry>
      <entry>2007-59</entry>
      <entry>pdf output</entry>
    </row>

  </tbody>
</tgroup>
</table>


      <para>
        Prerequisite tools are Bash 2.0 or later,
        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.doxygen.org/">Doxygen</link>, and
        the <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.gnu.org/software/coreutils/">GNU
        coreutils</link>. (GNU versions of find, xargs, and possibly
        sed and grep are used, just because the GNU versions make
        things very easy.) 
      </para>

      <para>
        To generate the pretty pictures and hierarchy
        graphs, the
        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.graphviz.org">Graphviz</link> package
        will need to be installed. For PDF
        output, <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.tug.org/applications/pdftex/">
        pdflatex</link> is required.
      </para>

      <para>
        Be warned the PDF file generated via doxygen is extremely
        large. At last count, the PDF file is over three thousand
        pages. Generating this document taxes the underlying TeX
        formatting system, and will require the expansion of TeX's memory
        capacity. Specifically, the <literal>pool_size</literal>
        variable in the configuration file <filename>texmf.cnf</filename> may
        need to be increased by a minimum factor of two.
      </para>
    </section>

    <section xml:id="doxygen.rules"><info><title>Generating the Doxygen Files</title></info>
      
      <para>
        The following Makefile rules run Doxygen to generate HTML
        docs, XML docs, XML docs as a single file, PDF docs, and the
        man pages. These rules are not conditional! If the required
        tools are not found, or are the wrong versions, the rule may
        end in an error.
      </para>

      <para>
      <screen><userinput>make doc-html-doxygen</userinput></screen>
      </para>

      <para>
      <screen><userinput>make doc-xml-doxygen</userinput></screen>
      </para>

      <para>
      <screen><userinput>make doc-xml-single-doxygen</userinput></screen>
      </para>

      <para>
      <screen><userinput>make doc-pdf-doxygen</userinput></screen>
      </para>

      <para>
      <screen><userinput>make doc-man-doxygen</userinput></screen>
      </para>

      <para>
        Generated files are output into separate sub directories of
        <filename class="directory">doc/doxygen/</filename> in the
        build directory, based on the output format. For instance, the
        HTML docs will be in <filename class="directory">doc/doxygen/html</filename>.
      </para>

      <para>
        Careful observers will see that the Makefile rules simply call
        a script from the source tree, <filename>run_doxygen</filename>, which
        does the actual work of running Doxygen and then (most
        importantly) massaging the output files. If for some reason
        you prefer to not go through the Makefile, you can call this
        script directly. (Start by passing <literal>--help</literal>.)
      </para>

      <para>
        If you wish to tweak the Doxygen settings, do so by editing
        <filename>doc/doxygen/user.cfg.in</filename>. Notes to fellow
        library hackers are written in triple-# comments.
      </para>

    </section>

    <section xml:id="doxygen.markup"><info><title>Markup</title></info>
      

      <para>
        In general, libstdc++ files should be formatted according to
        the rules found in the
        <link linkend="contrib.coding_style">Coding Standard</link>. Before
        any doxygen-specific formatting tweaks are made, please try to
        make sure that the initial formatting is sound.
      </para>

      <para>
        Adding Doxygen markup to a file (informally called
        <quote>doxygenating</quote>) is very simple. The Doxygen manual can be
        found
        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.stack.nl/~dimitri/doxygen/download.html#latestman">here</link>.
        We try to use a very-recent version of Doxygen.
      </para>

      <para>
        For classes, use
        <classname>deque</classname>/<classname>vector</classname>/<classname>list</classname>
        and <classname>std::pair</classname> as examples.  For
        functions, see their member functions, and the free functions
        in <filename>stl_algobase.h</filename>. Member functions of
        other container-like types should read similarly to these
        member functions.
      </para>

      <para>
        Some commentary to accompany
        the first list in the <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.stack.nl/~dimitri/doxygen/docblocks.html">Special
        Documentation Blocks</link> section of
        the Doxygen manual:
      </para>

      <orderedlist inheritnum="ignore" continuation="restarts">
        <listitem>
          <para>For longer comments, use the Javadoc style...</para>
        </listitem>

        <listitem>
          <para>
            ...not the Qt style. The intermediate *'s are preferred.
          </para>
        </listitem>

        <listitem>
          <para>
            Use the triple-slash style only for one-line comments (the
            <quote>brief</quote> mode).
          </para>
        </listitem>

        <listitem>
          <para>
            This is disgusting. Don't do this.
          </para>
        </listitem>
      </orderedlist>

      <para>
        Some specific guidelines:
      </para>

      <para>
        Use the @-style of commands, not the !-style. Please be
        careful about whitespace in your markup comments. Most of the
        time it doesn't matter; doxygen absorbs most whitespace, and
        both HTML and *roff are agnostic about whitespace. However,
        in &lt;pre&gt; blocks and @code/@endcode sections, spacing can
        have <quote>interesting</quote> effects.
      </para>

      <para>
        Use either kind of grouping, as
        appropriate. <filename>doxygroups.cc</filename> exists for this
        purpose. See <filename>stl_iterator.h</filename> for a good example
        of the <quote>other</quote> kind of grouping.
      </para>

      <para>
        Please use markup tags like @p and @a when referring to things
        such as the names of function parameters. Use @e for emphasis
        when necessary. Use @c to refer to other standard names.
        (Examples of all these abound in the present code.)
      </para>

      <para>
        Complicated math functions should use the multi-line
        format. An example from <filename>random.h</filename>:
      </para>

      <para>
<literallayout class="normal">
/**
 * @brief A model of a linear congruential random number generator.
 *
 * @f[
 *     x_{i+1}\leftarrow(ax_{i} + c) \bmod m
 * @f]
 */
</literallayout>
      </para>

      <para>
        One area of note is the markup required for
        <literal>@file</literal> markup in header files. Two details
        are important: for filenames that have the same name in
        multiple directories, include part of the installed path to
        disambiguate. For example:
      </para>

      <para>
<literallayout class="normal">
/** @file debug/vector
 *  This file is a GNU debug extension to the Standard C++ Library.
 */
</literallayout>
      </para>

      <para>
        The other relevant detail for header files is the use of a
        libstdc++-specific doxygen alias that helps distinguish
        between public header files (like <filename>random</filename>)
        from implementation or private header files (like
        <filename>bits/c++config.h</filename>.) This alias is spelled
        <literal>@headername</literal> and can take one or two
        arguments that detail the public header file or files that
        should be included to use the contents of the file. All header
        files that are not intended for direct inclusion must use
        <literal>headername</literal> in the <literal>file</literal>
        block. An example:
      </para>

      <para>
<literallayout class="normal">
/** @file bits/basic_string.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{string}
 */
</literallayout>
      </para>

      <para>
        Be careful about using certain, special characters when
        writing Doxygen comments. Single and double quotes, and
        separators in filenames are two common trouble spots. When in
        doubt, consult the following table.
      </para>

<table frame="all">
<title>HTML to Doxygen Markup Comparison</title>

<tgroup cols="2" align="left" colsep="1" rowsep="1">
<colspec colname="c1"/>
<colspec colname="c2"/>

  <thead>
    <row>
      <entry>HTML</entry>
      <entry>Doxygen</entry>
    </row>
  </thead>

  <tbody>
    <row>
      <entry>\</entry>
      <entry>\\</entry>
    </row>

    <row>
      <entry>"</entry>
      <entry>\"</entry>
    </row>

    <row>
      <entry>'</entry>
      <entry>\'</entry>
    </row>

    <row>
      <entry>&lt;i&gt;</entry>
      <entry>@a word</entry>
    </row>

    <row>
      <entry>&lt;b&gt;</entry>
      <entry>@b word</entry>
    </row>

    <row>
      <entry>&lt;code&gt;</entry>
      <entry>@c word</entry>
    </row>

    <row>
      <entry>&lt;em&gt;</entry>
      <entry>@a word</entry>
    </row>

    <row>
      <entry>&lt;em&gt;</entry>
      <entry>&lt;em&gt;two words or more&lt;/em&gt;</entry>
    </row>
  </tbody>

</tgroup>
</table>


    </section>

  </section>

  <section xml:id="doc.docbook"><info><title>Docbook</title></info>
    

    <section xml:id="docbook.prereq"><info><title>Prerequisites</title></info>
      
      
 <table frame="all">
<title>Docbook Prerequisites</title>

<tgroup cols="3" align="center" colsep="1" rowsep="1">
<colspec colname="c1"/>
<colspec colname="c2"/>
<colspec colname="c3"/>

  <thead>
    <row>
      <entry>Tool</entry>
      <entry>Version</entry>
      <entry>Required By</entry>
    </row>
  </thead>

  <tbody>

    <row>
      <entry>docbook5-style-xsl</entry>
      <entry>1.76.1</entry>
      <entry>all</entry>
    </row>

    <row>
      <entry>xsltproc</entry>
      <entry>1.1.26</entry>
      <entry>all</entry>
    </row>

    <row>
      <entry>xmllint</entry>
      <entry>2.7.7</entry>
      <entry>validation</entry>
    </row>

    <row>
      <entry>dblatex</entry>
      <entry>0.3</entry>
      <entry>pdf output</entry>
    </row>

    <row>
      <entry>pdflatex</entry>
      <entry>2007-59</entry>
      <entry>pdf output</entry>
    </row>

    <row>
      <entry>docbook2X</entry>
      <entry>0.8.8</entry>
      <entry>info output</entry>
    </row>

    <row>
      <entry>epub3 stylesheets</entry>
      <entry>b3</entry>
      <entry>epub output</entry>
    </row>

  </tbody>
</tgroup>
</table>

      <para>
        Editing the DocBook sources requires an XML editor. Many
        exist: some notable options
        include <command>emacs</command>, <application>Kate</application>,
        or <application>Conglomerate</application>.
      </para>

      <para>
        Some editors support special <quote>XML Validation</quote>
        modes that can validate the file as it is
        produced. Recommended is the <command>nXML Mode</command>
        for <command>emacs</command>.
      </para>

      <para>
        Besides an editor, additional DocBook files and XML tools are
        also required.
      </para>

      <para>
        Access to the DocBook 5.0 stylesheets and schema is required. The
        stylesheets are usually packaged by vendor, in something
        like <filename>docbook5-style-xsl</filename>. To exactly match
        generated output, please use a version of the stylesheets
        equivalent
        to <filename>docbook5-style-xsl-1.75.2-3</filename>. The
        installation directory for this package corresponds to
        the <literal>XSL_STYLE_DIR</literal>
        in <filename>doc/Makefile.am</filename> and defaults
        to <filename class="directory">/usr/share/sgml/docbook/xsl-ns-stylesheets</filename>.
      </para>

      <para>
        For processing XML, an XSLT processor and some style
        sheets are necessary. Defaults are <command>xsltproc</command>
        provided by <filename>libxslt</filename>.
      </para>

      <para>
        For validating the XML document, you'll need
        something like <command>xmllint</command> and access to the
        relevant DocBook schema. These are provided
        by a vendor package like <filename>libxml2</filename> and <filename>docbook5-schemas-5.0-4</filename>
      </para>

      <para>
        For PDF output, something that transforms valid Docbook XML to PDF is
        required. Possible solutions include <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://dblatex.sourceforge.net">dblatex</link>,
        <command>xmlto</command>, or <command>prince</command>. Of
        these, <command>dblatex</command> is the default. Other
        options are listed on the DocBook web <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://wiki.docbook.org/topic/DocBookPublishingTools">pages</link>. Please
        consult the <email>libstdc++@gcc.gnu.org</email> list when
        preparing printed manuals for current best practice and
        suggestions.
      </para>

      <para>
        For Texinfo output, something that transforms valid Docbook
        XML to Texinfo is required. The default choice is <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://docbook2x.sourceforge.net/">docbook2X</link>.
      </para>

      <para>
        For epub output, the <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://sourceforge.net/projects/docbook/files/epub3/">stylesheets</link> for EPUB3 are required. These stylesheets are still in development. To validate the created file, <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://code.google.com/p/epubcheck/">epubcheck</link> is necessary.
      </para>
    </section>

    <section xml:id="docbook.rules"><info><title>Generating the DocBook Files</title></info>
      

      <para>
        The following Makefile rules generate (in order): an HTML
        version of all the DocBook documentation, a PDF version of the
        same, and a single XML document.  These rules are not
        conditional! If the required tools are not found, or are the
        wrong versions, the rule may end in an error.
      </para>

      <para>
      <screen><userinput>make doc-html-docbook</userinput></screen>
      </para>

      <para>
      <screen><userinput>make doc-pdf-docbook</userinput></screen>
      </para>

      <para>
      <screen><userinput>make doc-xml-single-docbook</userinput></screen>
      </para>

      <para>
        Generated files are output into separate sub directores of
        <filename class="directory">doc/docbook/</filename> in the
        build directory, based on the output format. For instance, the
        HTML docs will be in <filename
        class="directory">doc/docbook/html</filename>.
      </para>

      <para>
        If the Docbook stylesheets are installed in a custom location,
        one can use the variable <literal>XSL_STYLE_DIR</literal> to
        override the Makefile defaults. For example:
      </para>

      <screen>
        <userinput>
make <literal>XSL_STYLE_DIR="/usr/share/xml/docbook/stylesheet/nwalsh"</literal> doc-html-docbook
        </userinput>
      </screen>

      </section>

    <section xml:id="docbook.validation"><info><title>Editing and Validation</title></info>

      <para>
        After editing the xml sources, please make sure that the XML
        documentation and markup is still valid. This can be
        done easily, with the following validation rule:
      </para>

      <screen>
        <userinput>make doc-xml-validate-docbook</userinput>
      </screen>

      <para>
        This is equivalent to doing:
      </para>
      
      <screen>
        <userinput>
          xmllint --noout --valid <filename>xml/index.xml</filename>
        </userinput>
      </screen>

      <para>
        Please note that individual sections and chapters of the
        manual can be validated by substituting the file desired for
        <filename>xml/index.xml</filename> in the command
        above. Reducing scope in this manner can be helpful when
        validation on the entire manual fails.
      </para>

      <para>
        All Docbook xml sources should always validate. No excuses!
      </para>

    </section>

    <section xml:id="docbook.examples"><info><title>File Organization and Basics</title></info>
      

    <literallayout class="normal">
      <emphasis>Which files are important</emphasis>

      All Docbook files are in the directory
      libstdc++-v3/doc/xml

      Inside this directory, the files of importance:
      spine.xml         - index to documentation set
      manual/spine.xml  - index to manual
      manual/*.xml      - individual chapters and sections of the manual
      faq.xml           - index to FAQ
      api.xml           - index to source level / API

      All *.txml files are template xml files, i.e., otherwise empty files with
      the correct structure, suitable for filling in with new information.

      <emphasis>Canonical Writing Style</emphasis>

      class template
      function template
      member function template
      (via C++ Templates, Vandevoorde)

      class in namespace std: allocator, not std::allocator

      header file: iostream, not &lt;iostream&gt;


      <emphasis>General structure</emphasis>

      &lt;set&gt;
      &lt;book&gt;
      &lt;/book&gt;

      &lt;book&gt;
      &lt;chapter&gt;
      &lt;/chapter&gt;
      &lt;/book&gt;

      &lt;book&gt;
      &lt;part&gt;
      &lt;chapter&gt;
      &lt;section&gt;
      &lt;/section&gt;

      &lt;sect1&gt;
      &lt;/sect1&gt;

      &lt;sect1&gt;
      &lt;sect2&gt;
      &lt;/sect2&gt;
      &lt;/sect1&gt;
      &lt;/chapter&gt;

      &lt;chapter&gt;
      &lt;/chapter&gt;
      &lt;/part&gt;
      &lt;/book&gt;

      &lt;/set&gt;
    </literallayout>
    </section>

    <section xml:id="docbook.markup"><info><title>Markup By Example</title></info>
      

      <para>
        Complete details on Docbook markup can be found in the DocBook
        Element Reference,
        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.docbook.org/tdg/en/html/part2.html">online</link>.
        An incomplete reference for HTML to Docbook conversion is
        detailed in the table below.
      </para>

<table frame="all">
<title>HTML to Docbook XML Markup Comparison</title>

<tgroup cols="2" align="left" colsep="1" rowsep="1">
<colspec colname="c1"/>
<colspec colname="c2"/>

  <thead>
    <row>
      <entry>HTML</entry>
      <entry>Docbook</entry>
    </row>
  </thead>

  <tbody>
    <row>
      <entry>&lt;p&gt;</entry>
      <entry>&lt;para&gt;</entry>
    </row>
    <row>
      <entry>&lt;pre&gt;</entry>
      <entry>&lt;computeroutput&gt;, &lt;programlisting&gt;,
        &lt;literallayout&gt;</entry>
    </row>
    <row>
      <entry>&lt;ul&gt;</entry>
      <entry>&lt;itemizedlist&gt;</entry>
    </row>
    <row>
      <entry>&lt;ol&gt;</entry>
      <entry>&lt;orderedlist&gt;</entry>
    </row>
    <row>
      <entry>&lt;il&gt;</entry>
      <entry>&lt;listitem&gt;</entry>
    </row>
    <row>
      <entry>&lt;dl&gt;</entry>
      <entry>&lt;variablelist&gt;</entry>
    </row>
    <row>
      <entry>&lt;dt&gt;</entry>
      <entry>&lt;term&gt;</entry>
    </row>
    <row>
      <entry>&lt;dd&gt;</entry>
      <entry>&lt;listitem&gt;</entry>
    </row>

    <row>
      <entry>&lt;a href=""&gt;</entry>
      <entry>&lt;ulink url=""&gt;</entry>
    </row>
    <row>
      <entry>&lt;code&gt;</entry>
      <entry>&lt;literal&gt;, &lt;programlisting&gt;</entry>
    </row>
    <row>
      <entry>&lt;strong&gt;</entry>
      <entry>&lt;emphasis&gt;</entry>
    </row>
    <row>
      <entry>&lt;em&gt;</entry>
      <entry>&lt;emphasis&gt;</entry>
    </row>
    <row>
      <entry>"</entry>
      <entry>&lt;quote&gt;</entry>
    </row>
   </tbody>
</tgroup>
</table>

<para>
  And examples of detailed markup for which there are no real HTML
  equivalents are listed in the table below.
</para>

<table frame="all">
<title>Docbook XML Element Use</title>

<tgroup cols="2" align="left" colsep="1" rowsep="1">
<colspec colname="c1"/>
<colspec colname="c2"/>

  <thead>
    <row>
      <entry>Element</entry>
      <entry>Use</entry>
    </row>
  </thead>

  <tbody>
    <row>
      <entry>&lt;structname&gt;</entry>
      <entry>&lt;structname&gt;char_traits&lt;/structname&gt;</entry>
    </row>
    <row>
      <entry>&lt;classname&gt;</entry>
      <entry>&lt;classname&gt;string&lt;/classname&gt;</entry>
    </row>
    <row>
      <entry>&lt;function&gt;</entry>
      <entry>
        <para>&lt;function&gt;clear()&lt;/function&gt;</para>
        <para>&lt;function&gt;fs.clear()&lt;/function&gt;</para>
      </entry>
    </row>
    <row>
      <entry>&lt;type&gt;</entry>
      <entry>&lt;type&gt;long long&lt;/type&gt;</entry>
    </row>
    <row>
      <entry>&lt;varname&gt;</entry>
      <entry>&lt;varname&gt;fs&lt;/varname&gt;</entry>
    </row>
    <row>
      <entry>&lt;literal&gt;</entry>
      <entry>
        <para>&lt;literal&gt;-Weffc++&lt;/literal&gt;</para>
        <para>&lt;literal&gt;rel_ops&lt;/literal&gt;</para>
      </entry>
    </row>
    <row>
      <entry>&lt;constant&gt;</entry>
      <entry>
        <para>&lt;constant&gt;_GNU_SOURCE&lt;/constant&gt;</para>
        <para>&lt;constant&gt;3.0&lt;/constant&gt;</para>
      </entry>
    </row>
    <row>
      <entry>&lt;command&gt;</entry>
      <entry>&lt;command&gt;g++&lt;/command&gt;</entry>
    </row>
    <row>
      <entry>&lt;errortext&gt;</entry>
      <entry>&lt;errortext&gt;In instantiation of&lt;/errortext&gt;</entry>
    </row>
    <row>
      <entry>&lt;filename&gt;</entry>
      <entry>
        <para>&lt;filename class="headerfile"&gt;ctype.h&lt;/filename&gt;</para>
        <para>&lt;filename class="directory"&gt;/home/gcc/build&lt;/filename&gt;</para>
        <para>&lt;filename class="libraryfile"&gt;libstdc++.so&lt;/filename&gt;</para>
      </entry>
    </row>
   </tbody>
</tgroup>
</table>

</section>
</section>
</section>