#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:  pm#collection  something gathering separated things (entities/situations)
              supertype:  pm#divisible_entity__divisibleentity  many classifications under this category are application-dependant
                 supertype:  pm#entity  something that can be "involved" in a situation
                    supertype:  pm#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:  pm#divisible_thing__divisiblething
                    supertype:  pm#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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