is#user_interface
  supertype:  user_interface__interface  (computer science) a program that controls a display for the user (usually on a computer monitor) and that allows the user to interact with the system
  subtype:  non-graphical_user_interface
     subtype:  procedure_call_interface
        subtype:  network-accessible_procedure_call_interface
           subtype:  RPC_interface__Remote_Procedure_Call_interface__remoteprocedurecallinterface
        subtype:  API__application_programming_interface__applicationprogramminginterface
     subtype:  command_based_interface__commandbasedinterface
        subtype:  network-accessible_command_based_interface
           subtype:  OKBC_interface
           subtype:  CGI-accessible_command_based_interface
        subtype:  direct_command_based_interface__shell
           subtype:  sh
           subtype:  ksh
           subtype:  csh
  subtype:  graphical_user_interface
  subtype:  network-accessible_interface
     subtype:  Web_based_interface
        subtype:  HTML_based_interface
        subtype:  CGI_based_interface
     subtype:  network-accessible_procedure_call_interface
     subtype:  network-accessible_command_based_interface

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