is#non-graphical_user_interface
  exclusion:  graphical_user_interface
  supertype:  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

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