#spectrum  an ordered array of the components of an emission or wave
  subtype:  absorption_spectrum  action_spectrum  electromagnetic_spectrum  emission_spectrum  infrared_spectrum  line_spectrum  microwave_spectrum  radio_spectrum  sound_spectrum  ultraviolet_spectrum  visible_spectrum
  part:  spectrum_line
  supertype:  array  an orderly arrangement: "an array of troops in battle order"
     supertype:  arrangement  an orderly grouping (of things or persons)
        supertype:  group__grouping  any number of entities (members) considered as a unit
           supertype:  collection  something gathering separated things (entities/situations)
              supertype:  divisible_entity__divisibleentity  many classifications under this category are application-dependant
                 supertype:  entity  something that can be "involved" in a situation
                    supertype:  thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
                 supertype:  divisible_thing__divisiblething
                    supertype:  thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

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