anchor.diff:      * If you installed Gerbil using RubyGems, then run <pre>gerbil -v</pre> and select the right-most item in the output--that is the path of Gerbil's installation directory.
   
       Inside Gerbil's installation directory, you will see (among other things) the following items:
  +    * <tt>bin/</tt> - contains executable programs.
  +    ** <tt>gerbil</tt> - the main source code of Gerbil.
  +    * <tt>fmt/</tt> - contains the predefined set of format specification files (see <%= xref 'SpecFile' %>). If you ever need to install your custom format specification file globally, put it inside this directory.
  +    <% Gerbil[:format_files].each do |file| %>
  +    ** <tt><%= File.basename(file) %></tt> - <%= YAML.load_file(file)['desc'] %>
  +    <% end %>
  +    * <tt>lib/</tt> - Gerbil automatically adds this directory to Ruby's load path.
  +    ** <tt>gerbil.rb</tt> - project version information.
  +    ** <tt>gerbil/</tt>
  +    *** <tt>html.rb</tt> - provides the @String#to_html@ method.
  +    *** <tt>rdoc.rb</tt> - provides RDoc parse trees to Ruby code.
       * <tt>doc/</tt> - contains the user guide and other documentation.
       ** <tt>gerbil.svg</tt> - the source file of the Gerbil logo.
       ** <tt>guide.erb</tt> - the source file of this user guide.
  -    * <tt>format/</tt> - contains the predefined set of format specification files (see <%= xref 'SpecFile' %>). If you ever need to install your custom format specification file globally, put it inside this directory.
  -    <% Gerbil[:format_files].each do |file| %>
  -    ** <tt><%= File.basename(file) %></tt> - <%= YAML.load_file(file)['desc'] %>
  -    <% end %>
  -    * <tt>gerbil</tt> - the main source code of Gerbil.
       * <tt>LICENSE</tt> - the project license and copyright notice.
  +  <% end %>
  +
  +  <% section 'Version numbering system' do %>
  +    Gerbil uses the "RubyGems rational versioning policy":http://www.rubygems.org/read/chapter/7 to number its releases. This *major.minor.patch* numbering policy "is summarized":http://ablog.apress.com/?p=738 as follows.
  +
  +    | Version number components: |_. Major |_. Minor |_. Patch |
  +    |_. Backwards compatible?    | no      | yes     | yes     |
  +    |_. New features?            | yes     | yes     | no      |
  +    |_. Bug fixes?               | yes     | yes     | yes     |
     <% end %>
   <% end %>
   
  
positive.code:   mailing_list_url  = 'http://rubyforge.org/mailman/listinfo/gerbil-talk'
    mailing_list_link = link(mailing_list_url, "project mailing list")
    download_url      = 'http://rubyforge.org/frs/?group_id=4905'
    feed_url          = File.join(Gerbil[:website], 'rss.xml')
    feed_icon_url     = File.join(Gerbil[:website], 'feed-icon-28x28.png')
  
    # parameters for the HTML format
    $title   = "Gerbil #{Gerbil[:version]} user guide"
    $authors = {'Suraj N. Kurapati' => 'http://rassmalog.rubyforge.org/blog/'}
    $logo    = '<img src="gerbil.png" alt="Gerbil logo" title="Gerbil logo"/>'
    $feeds   = { feed_url => :rss }
  
    # parameters for Gerbil
    $unindent = '  '
  
negative.code: 
    Gerbil is *lighter* and more *flexible* than "DocBook":http://www.docbook.org, "Deplate":http://deplate.sourceforge.net, and "SiSU":http://www.jus.uio.no/sisu/SiSU/ because it is small, fast, and lets you <%= xref "HelloWorld", "define your own custom format" %>. Furthermore, Gerbil is *scriptable* unlike raw text generators such as "AsciiDoc":http://www.methods.co.nz/asciidoc/, "txt2tags":http://txt2tags.sourceforge.net, and "Grutatxt":http://www.triptico.com/software/grutatxt.html because it lets you inject Ruby code directly into your documents for dynamic content generation.
  
    Gerbil is *open-source software* (see <%= xref "License" %>) so feel free to contribute your improvements and discuss your ideas in the <%= mailing_list_link %>. You can obtain the source code from Gerbil's "Darcs":http://darcs.net repository by running the following command:
  
      darcs get <%= source_repo_url %> gerbil
  
    <% note "See the source of this guide" do %>
      Did you know that this user guide was generated by Gerbil? Here is "the source document":guide.erb to prove it!
  