Extensions Practical Guide

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Caption reference
CapRefIda-dependent-module-implies-that-it-depends-on-another-module-as-opposed-being-depended-on
CapRefTypeFigure
  illustrates a local extension module that references content in a national extension, and is therefore dependent on the national extension module; and similarly a national extension module that references content in the  International Edition, and is therefore dependent on the international modules. 

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Caption label
CapIda-dependent-module-implies-that-it-depends-on-another-module-as-opposed-being-depended-on
CapTypeFigure
A dependent module references content in the module it depends on

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In this example, a local extension contains a simple reference set that represents a subset of concepts. If one or more of the concepts in this subset belong to the National Extension, the extension reference set will contain rows in which the referencedComponentId refers to concepts from a module in the national extension. In this way, content from the local extension module relies on a module from the National Extension. 

Caption reference
CapRefIda-content-dependency-basedcaused-onby-a-reference-refetset-member
CapRefTypeFigure
  illustrates another example in which a content dependency results in a module dependency.

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In this example, the extension includes new clinical content. Because all active concepts in an extension must be subsumed by the root concept, |SNOMED CT Concept|, there must exist at least one 

Concept
ShowPartsterm
t116680003 |is a|
 relationship in the extension with a destinationId that refers to a concept in another module. Clinical content in the extension module must depend on the international core module either directly or indirectly. 
Caption reference
CapRefIda-content-dependency-caused-by-basedan-onis-hierarchicala-relationship
CapRefTypeFigure
 illustrates another example in which a content dependency results in a module dependency.

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Caption label
CapIda-content-dependency-caused-by-an-is-a-relationship
CapTypeFigure
A content dependency caused by an |is a| relationship

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Module Dependency Reference Set
The content dependencies described above create a need to establish a formal link between the dependent module and the modules on which it depends. These dependencies are defined in SNOMED CT at the module level, rather than being defined based on an entire extension. This allows extensions to be subdivided into separate modules, with different dependencies on modules in the same extension, in other extensions, or in the International Edition.
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