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A systemization describes a set of assertions about the relationships between:·        

  •  Two entity descriptions. 

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  • An entity description and a set of entity descriptions. 

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  • The absence of a relationship between an entity description and any other entity descriptions. 

The set of assertions within a given systemization are assumed to be consistent and cohesive and, in some cases, targeted for a specific use. As an example, the set of relationships in the SNOMED?CT relationships table are considered to be one systemization (assuming we ignore localizations). The mapping between SNOMED?CT and ICD?9?CDM released by IHTSDO would be considered a second systemization.

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