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Subclass Hierarchy Tree

- entity
     + physical
     - abstract
          + quantity
          + attribute
          + set or class
          - relation
               + single valued relation
               - total valued relation
                    * duration
               * partial valued relation
               + binary relation
               + probability relation
               + spatial relation
               + temporal relation
               + ternary relation
               + quaternary relation
               + quintary relation
               + list
               + predicate
               + variable arity relation
               + relation extended to quantities
          + proposition
          + graph
          + graph element