#file__data_file  a set of related records (either written or electronic) kept together
  supertype:  #document  anything serving as a representation of a person's thinking by means of symbolic marks
  subtype:  #computer_file  (computer science) a file maintained in computer-readable form
     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
  subtype:  #mug_file__mugfile__mug_book__mugbook  a file of mug shots (pictures of criminals that are kept on file by the police)
  subtype:  #tickler_file__ticklerfile__tickler  a file of memoranda or notices that remind of things to be done
  subtype:  pm#special_file__specialfile
     subtype:  pm#computer_program__software_file
        subtype:  pm#freeware_file
        subtype:  pm#web_search_engine
        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#documentation
        subtype:  pm#tutorial
        subtype:  pm#lecture
        subtype:  pm#user_manual
        subtype:  #software_documentation__documentation  program listings or technical manuals describing the operation and use of programs
        instance:  http://www.webkb.org/doc/w2doc.html
     subtype:  pm#repository
        subtype:  pm#web_index__webindex
           subtype:  pm#web_index_and_search_engine
        subtype:  pm#Yellow_Pages
        subtype:  pm#WWW_home_page
        subtype:  pm#cookie
     subtype:  pm#WWW_file
  subtype:  pm#unretrievable_file__unretrievablefile



1 schema is about #file
[pm#graph1_on_file
     [any #file,
          may have for pm#url: a pm#URL,
          pm#result of: a #writing,
          pm#authoring_date: a pm#time_measure,
          may have for pm#creator: a #person,
          may have for dc#Creator: a pm#string,
          may have for #size: a #computer_memory_unit,
          may have for pm#format: a #data_format,
          may have for pm#title: a pm#string,
          may have for dc#Coverage: a pm#thing,
          pm#descr of: a pm#situation]
];


1 statement is about an indirect instance of #file (http://www.webkb.org/doc/w2doc.html): pm#graph1_on_WebKB-2
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