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SNOMED CT content may sometimes need to be moved from one module to another, to enable it to be published in a different edition. Moving SNOMED CT content up the module dependency chain (i.e. from a given module to a module on which it depends) is known as content promotion. This may be required to make the content accessable accessible to a wider audience. Moving SNOMED CT content down the module dependency chain (i.e. from a given module to a module that is dependent on it) is known as content demotion. This may be required to make the content accessable accessible to a narrower audience. In these situations, it is essential to be aware of the principles for promotion and demotion. These principles ensure the integrity and traceability of the content, in both the original module and the module to which it is moved.

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