DEFINITION MODULE STutility; (*DEE 2014-01-22/2015-11-25*)
  FROM STchars IMPORT character;

  PROCEDURE islower(c: character): BOOLEAN;
  PROCEDURE isupper(c: character): BOOLEAN;
  PROCEDURE isletter (n: character): BOOLEAN;
  PROCEDURE isalphanum (n: character): BOOLEAN;
  PROCEDURE isdigit (c: character): BOOLEAN;
  PROCEDURE ispunct (p: character): BOOLEAN;
  PROCEDURE max(x, y: INTEGER): INTEGER;
  PROCEDURE min (x, y: INTEGER): INTEGER;
END STutility.