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Data Modelling 2 (Modelling data with UML class diagram (Association…

- - - - public(+), private(-), protected(#), derived(/)
    - - eg: "new user"
    - - indicate further characteristics. eg: {ordered}
  - - - disjoint vs overlapping
        
        disjoint: object of super class can belong to only one subclass
        
        overlapping: objects of superclass may belong to two or multiple subclass
      - complete vs incomplete
        
        complete: each obj of super class belong to at least one subclass
        
        incomplete: may be obj from the superclass does not belong to any subclass
      - Possible combination
        
        disjoint and complete
        
        disjoint and incomplete
        
        overlapping and complete
        
        overlapping and incomplete