anchor.diff:  */
   grammar creole;
      
  +document
  +    : (line? CR)*
  +    ;
  +
  +line
  +    : markup+ 
  +    ;
  +
   markup
  -    : (bold
  +    : bold
       | italics
       | href
       | title
  -    | line
  +    | hline
       | text
       | listitem
       | image
       | table
  -    | nowiki)+
  +    | nowiki
       ;
       
   text
  
positive.code:     ;
  
  title
      : '='+ markup '='+
      ;
  
  nowiki
  
negative.code:     : LBRACE text RBRACE
      ;
  
  hline
      : '----'
      ;
  
  