anchor.diff:  
   *Legacy DB element*: <appendix>
   
  -*New HTML element*: <section>
  +*HTML element*: <section>
   
   *Special semantics*: +class="appendix"+ or class="afterword", depending on content
   
  
positive.code: 
  *Legacy DB element*: <bibliography>
  
  *New HTML element*: <section>
  
  *Special semantics*: +class="bibliography"+ for main bibliography; class="biblioentry" for each biblioentry
  
  
negative.code: 
  *Legacy DB element*: <toc> (which we never use, because we autogenerate our TOCs)
  
  *HTML element*: <nav>
  
  *Special semantics*: +class="toc"+ (epub:type="toc" must be added for EPUB 3 output, if not in source)
  
  