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The logical design of a SNOMED CT extension is technically consistent with that of the International Edition. Both represent and version SNOMED CT components and reference sets in release files that conform to the
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Every SNOMED CT extension includes one or more modules, and each module contains either SNOMED CT components or reference sets (or both). Modules are may be dependent on other modules. A national or local extension uses a namespace identifier issued by SNOMED International to ensure that all extension components can be uniquely identified (across all extensions). A SNOMED CT edition includes the contents of a focus module together with the contents of all the modules on which it depends. This includes the modules in the International Edition and possibly other modules from a national and/or local extension.
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