#classification_system  a system for classifying things
  supertype:  #organisation__arrangement__organization__system  an organized structure for arranging or classifying; "he changed the arrangement of the topics"; "the facts were familiar but it was in the organization of them that he was original"; "he tried to understand their system of classification"
  subtype:  #hierarchical_classification_system  a classification system where entries are arranged based on some hierarchical structure
  subtype:  #rating_system__scoring_system__scoringsystem  a system of classifying according to quality or merit or amount
  subtype:  #file_system__filing_system  a system of classifying into files (usually arranged alphabetically)
  subtype:  #pigeonholing__grouping  a system for classifying things into groups
     subtype:  #ABO_blood_group_system__ABO_system__ABO_group  a classification system for the antigens of human blood; used in blood transfusion therapy; four groups are A and B and AB and O

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