sumo#real_number  a number that can be expressed as a (possibly infinite) decimal, i.e. a number that has a position on the number line
  exclusion:  sumo#imaginary_number  sumo#complex_number
  supertype:  sumo#number
  equal:  kif#real (pm)
  subtype:  sumo#rational_number  real_number that is the product of dividing two integers
     subtype:  sumo#integer  a negative or nonnegative whole number
        subtype:  sumo#nonnegative_integer__nonnegativeinteger  integer >= 0
           subtype:  sumo#positive_integer  integer > 0
           subtype:  kif#zero  class containing only 0
        subtype:  sumo#negative_integer  integer < 0
        subtype:  sumo#even_integer  integer that is evenly divisible by 2
        subtype:  sumo#odd_integer__oddinteger  integer that is not evenly divisible by 2
        subtype:  sumo#prime_number__primenumber
  subtype:  sumo#irrational_number
  subtype:  sumo#nonnegative_real_number  real_number >= 0
     subtype:  sumo#nonnegative_integer__nonnegativeinteger  integer >= 0
     subtype:  sumo#positive_real_number  real_number > 0
        subtype:  sumo#positive_integer  integer > 0
  subtype:  sumo#negative_real_number  real_number < 0
     subtype:  sumo#negative_integer  integer < 0
  subtype:  sumo#binary_number  elements from the number system with base 2; every binary_number is expressed as a sequence of the digits 1 and 0
  subtype:  xsd#decimal

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