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Insertion of quotations from external files 

Automatic and programmed insertion of excerpts from external material is extremely useful in non-trivial documents

Superimposition of decorations (fonts and colors) makes it possible to focus the readers attention

 

  (read-text-file-between-marks
    file-path
    mark)
 

  (read-text-file-including-marks
    file-name
    start-mark end-mark)
 

  (colorize-substrings
    (read-text-file-between-marks
      file-path
      mark)
    font-and-color-specification)
 

 

We use these facilities a lot in course materials in the area of programming