#system_of_weights_and_measures  system of measurement for length and weight and duration
  supertype:  #system_of_measurement  a system of related measures
  subtype:  #English_system__British_system  a system of weights and measures based on the foot and pound and second
  subtype:  #metric_system  a decimal system of weights and measures based on the meter and the kilogram and the second
     subtype:  #cgs__cg  system of measurement based on centimeters and grams and seconds
     subtype:  #Systeme_International_d'Unites__Systeme_International__SI__International_System  a complete metric system of units of measurement for scientists; fundamental quantities are length (meter) and mass (kilogram) and time (second) and electric current (ampere) and temperature (kelvin) and amount of matter (mole) and luminous intensity (candela)

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