#technology__engineering  the practical application of science to commerce or industry
  supertype:  practical_application  profession
  subtype:  aeronautical_engineering  the activity of designing and constructing aircraft
  subtype:  automotive_technology__automotive_engineering  the activity of designing and constructing automobiles
  subtype:  chemical_engineering  the activity of applying chemistry to the solution of practical problems
  subtype:  communications_technology  the activity of designing and constructing and maintaining communication systems
     subtype:  digital_communications_technology  the design and construction of communications technology that transmits information in digital form
  subtype:  computer_technology  the activity of designing and constructing and programming computers
  subtype:  rail_technology__railroading  the activity of designing and constructing and operating railroads
     subtype:  magnetic_levitation  high-speed rail technology; train is suspended on a magnetic cushion above a magnetized track and so travels free of friction

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