SNOMED CT components and reference set members are added, modified or inactivated according to the SNOMED CT editorial principles and policies.
General principles that apply to all SNOMED CT extension content include:
Any modifications resulting in changes to the classification of international content must be accompanied by a disclaimer notifying users of the differences between the extension edition and the International Edition. Please note that modifications of this kind pose a risk to the comparability and interoperability of data captured using different SNOMED CT editions.
Extension producers should assign all new extension content to a module which they own. Therefore every concept, description, relationship and reference set member, which is managed within an extension, should belong to a module created and owned by the extension producer. As illustrated in Figure 5.4.1-1, this is accomplished by setting the moduleId attribute in each component and reference set file to a module concept that was created by the extension producer in the given extension. Any dependencies between components or reference set members in the extension module, and components or reference set members in other modules are specified in the module dependency reference set.
Figure 5.4.1-1: Examples of correct and incorrect module assignment in an extensionFor information on how to move content from one module to another, please refer to 220.127.116.11 Promotion and Demotion.