anchor.diff:  
           +LexemeStrings()
   
  -    details
  +    details(open=true)
           summary: h4 Boolean Flags
           +LexemeBooleans
   
           +method("check_flag", "flag_id")(open=true)
               | Get the value of one of the boolean flags
   
  -    details
  +    details(open=true)
           summary: h4 Distributional Features
           +LexemeDistributional()
   
  -    details
  +    details(open=true)
           summary: h4 Alignment and Output
   
           ul
  
positive.code:         +method("nbor(i=1)")(open=true)
              | Get the #[em i]th next / previous neighboring token.
  
      details
          summary: h4 Named Entities
  
          ul
  
negative.code: mixin summary
      block
  
  //mixin en_example
  //    pre.language-python: code
  //        include ../../code/api.example_war_and_peace
  
  mixin SeeAlso(name, link_target)
      a(href=link_target)
  