> For the complete documentation index, see [llms.txt](https://docs.snomed.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.snomed.org/snomed-international-documents/snomed-ct-glossary/e/extended-edition.md).

# extended edition

## extended edition

A SNOMED CT edition to which a specified set of additional modules has been added.

#### Notes

* An *extended edition* provides a way to add a set of modules containing maps, subsets and other derivatives to an edition.
* The module dependencies of all the additional *modules* must be satisfied by other *modules* in the *extended edition*.
* Additional *modules* included in an *extended versioned edition* may include additional reference sets and reference set members and metadata concepts (with descriptions and a subtype relationship linking them to the appropriate branch of the | SNOMED CT Model Component| hierarchy). However, they should **not** include other concepts, descriptions, relationships or OWL reference set members.

#### Examples

* The SNOMED CT International Edition with both the | International Health Terminology Standards Development Organisation general dentistry diagnostic module| and the | International Health Terminology Standards Development Organisation odontogram module| .
* The SNOMED CT Spanish Edition with the [| SNOMED CT to ICD-10 rule-based mapping module|](http://snomed.info/id/449080006) .

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