#computer_file  (computer science) a file maintained in computer-readable form
  supertype:  #file__data_file  a set of related records (either written or electronic) kept together
  subtype:  #backup_file  (computer science) a computer file dedicated to storing and updating computer backups
  subtype:  #binary_file  (computer science) a computer file containing machine-readable information that must be read by an application; characters use all 8 bits of each byte
     subtype:  pm#GIF_file
  subtype:  #master_file__main_file  (computer science) a computer file that is used as the authority in a given job and that is relatively permanent
  subtype:  #disk_file  (computer science) a computer file stored on a magnetic disk and identified by a unique label
  subtype:  #transaction_file__transactionfile__detail_file  (computer science) a computer file containing relatively transient data about a particular data processing task
  subtype:  #input_file__inputfile__input_data__inputdata  (computer science) a computer file that contains data that serve as input to a device or program
  subtype:  #output_file  (computer science) a computer file that contains data that are the output of a device or program
  subtype:  #read-only_file  (computer science) a file that you can read but cannot change
  subtype:  #text_file__document  (computer science) a computer file that contains text (and possibly formatting instructions) using 7-bit ASCII characters
     subtype:  #web_page__webpage  a document connected to the World Wide Web and viewable by anyone connected to the internet who has a web browser
     subtype:  #ASCII_text_file  a text file that contains only ASCII characters without special formatting
        subtype:  #source_code  program instructions written as an ASCII text file; must be translated by a compiler or interpreter or assembler into the object code for a particular computer before execution
     subtype:  pm#plain_text_file
     subtype:  pm#structured_text_file
        subtype:  pm#HTML_file
     subtype:  pm#encoded_text_file
        subtype:  pm#postscript_file

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