Document/presentation generation procedures

• Simplest, direct case: typewriter bi-unique key-type encoding
  
  
• Complex encodings: key -- CODE -- type encoding
  
  
  There may be no inverse function
  
  
• Development of document generation procedures:
  • typewriter: WYSIWYG, ``What You See Is What You Get''
  • early word processors: visible intermediate codings:
    • simplification to bare characters
    • optional code viewing
    • additional previewing
  • modern word processors: WYSIWYG, ``What You See Is What You Get'' (but maybe didn't want...)