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Association/Correlation and Cardinality

The aim is for the source and target to be "equivalent" (i.e. an exact semantic match).

However, some maps will not be exact. In these situations, the map will have a different association type:

A narrower (than) map: This association is used when the meaning of the SNOMED CT concept is is narrower than the  the meaning of the EDQM concept.

• Another way of saying this is that this is a "broad-to-narrow" map (from the EDQM source concept to the SNOMED CT target concept); this is a 'narrower' mapping because the map is to a concept with a narrower meaning than the source concept
  
  • For example, a mapping between "Medicated sponge"  in EDQM to "Conventional release cutaneous sponge (dose form)" in SNOMED CT is "narrower" -  as the EDQM concept is very generic in terms of not specifying an intended site of administration, whereas the SNOMED CT concept does explicitly have an intended site of administration (cutaneous).
• Note that when 'Narrower than target' maps are made, these may give a 1..* cardinality between an EDQM concept and SNOMED CT concepts, especially when the mapping is considered in its entirety.

A broader (than) map: This association is used when the meaning of the SNOMED CT concept is is broader than the  the meaning of the EDQM concept, and it is not possible or considered reasonable to author new, more granular SNOMED CT concepts

• Another way of saying this is that this is a "narrow-to-broad" map (from the EDQM source concept to the SNOMED CT target concept); this is a 'broader' mapping because the map is is to a concept with a broader meaning than the source concept
  
  • For example, a mapping between  "Inhalation powder, hard capsule" in EDQM to "Conventional release powder for inhalation (dose form)" in SNOMED_CT is "broader" - as the EDQM concept is precise, particularly in regard to the encapsulation of the dose form whereas the SNOMED CT concept is less explicit, with no description of encapsulation of the inhalation powder.
• Note that when "'Broader than target’ maps may be made; these may give a *..1 cardinality when the mapping is considered in its entirety.

In all cases where the mapping is 'Broader than’ or 'Narrower than', implementation guidance is provided.