sumo#integer  a negative or nonnegative whole number
  supertype:  sumo#rational_number  higgins#DigitalSubject (pm)
  equal:  kif#integer (pm)  xsd#integer (pm)
  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

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