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For example, a simple hierarchy could only represent |cellulitis of foot| as either a type of |disorder of foot| or a type of |cellulitis|. As shown in in Figure 3, the SNOMED CT subtype polyhierarchy captures both of these supertype relationships.
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In addition to the relationships that form the subtype polyhierarchy, SNOMED CT also includes other relationships which represent features of a concept that distinguish it from its supertypes. For example, as shown in Figure 4, the defining relationships of |cellulitis of foot| also include relevant values for |associated morphology| and |finding site|.
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