anchor.diff:  
   *HTML element*: <dl>
   
  -*Special semantics*: Generally none, but see <<glossary>> for an example of a special case
  -
  -*Note*: Optionally, you could add <p>s to a <dd> with multiple paragraphs.
  +*Content model*: Mirrors HTML5 Specification
  +
  +*Content model for <dt> children*: text and/or zero or more Inline elements
  +
  +*Content model for <dd> children*: Either of the following is acceptable:
  +
  +* text and/or zero or more Inline elements
  +* Zero or more Block elements
   
   *Example*:
   
   ----
   <dl>
  -  <dt>Constant Width Bold</dt>
  +  <dt>Constant Width Bold font</dt>
     <dd>Used to indicate user input</dd>
   </dl>
   ----
  
positive.code: 
  *HTML element*: <a>
  
  *Special semantics*: class="xref"footnote:[From DocBook; no close match in EPUB 3 Structural Semantics Vocabulary]
  
  Example:
  
  
negative.code:       <li class="index:term">azalea, <a href="ch01#azalea" class="index:locator">Shrubbery</a></li>
      </ol>
    </div>
  </section>
  ----
  
  ==== Sections
  
  *HTML element*: <section>
  
  *Attribute requirements*: class="sect1", class="sect2", class="sect3", class="sect4", class="sect5"footnote:[From DocBook vocabulary], depending on hierarchy level. "sect1" is used for <section> elements nested directly in main Book components ("chapter", "appendix", etc.). "sect2" is used for <section> elements nested in a "sect1" <section>, "sect3" is used for <section> elements nested in a "sect2" <section>, and so on. 
  
  *Content model*: The first child must be a heading element corresponding to the hierarchy level indicated by "class" value, as follows:
  
  ----
  "sect1" -> h1
  "sect2" -> h2
  "sect3" -> h3
  "sect4" -> h4
  "sect5" -> h5
  ----
  
  The heading is followed by zero or more Block elements, followed by zero or more <section> elements with a class value one level lower in the hierarchy, as long as the parent section is a "sect4" or higher (e.g., <section class="sect4"> nested in <section class="sect3">)
  
  *Example*:
  
  ----
  <section class="sect1">
    <h1>A-Head</h1>
    <p>If you httpparty, you must party hard</p>
    <!-- Some more paragraphs -->
    <section class="sect2">
      <h2>B-Head</h2>
      <p>What's the frequency, Kenneth?</p>
      <!-- And so on... -->
    </section>
  </section>
  ----
  
  