Components that are created in an extension are identified using extensionSCTIDs. These identifiers include an extension namespace which ensures that they do not collide with other SCTIDs, and can be traced to an authorized originator.
Members may create, maintain and distribute extensions to address specific national, regional and language requirements. SNOMED International Affiliates may also create, maintain and distribute extensions to meet the needs of particular software solutions and customers.
See also Edition which refers to the combination of an extension with the International Release and, where relevant, any modules from other extensions on which it depends.