anchor.diff:  ;;;t \index{keyword}
   ;;;t \index{reserved keywords}
   
  -;;; The following keywords and symbols are reserved in ParenScript,
  +;;; The following keywords and symbols are reserved in Parenscript,
   ;;; and should not be used as variable names.
   
   ! ~ ++ -- * / % + - << >> >>> < > <= >= == != ==== !== & ^ | && || *=
  
positive.code: 
  ; (PS-HTML html-expression)
  
  ;;; The HTML generator of ParenScript is very similar to the htmlgen
  ;;; HTML generator library included with AllegroServe. It accepts the
  ;;; same input forms as the AllegroServer HTML generator. However,
  ;;; non-HTML construct are compiled to JavaScript by the ParenScript
  ;;; compiler. The resulting expression is a JavaScript expression.
  
  (ps-html ((:a :href "foobar") "blorg"))
  
negative.code: (ps-html ((:a :href (generate-a-link)) "blorg"))
  => '<A HREF=\"' + generateALink() + '\">blorg</A>'
  
  ;;; We can recursively call the Parenscript compiler in an HTML
  ;;; expression.
  
  (document.write
  