> 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-ct-specifications/snomed-ct-release-file-specification/component-release-file-specification/4.2-file-format-specifications.md).

# File Format Specifications

The following subsections provide details of the format of the SNOMED CT component release files.

* [Concept File Specification](/snomed-ct-specifications/snomed-ct-release-file-specification/component-release-file-specification/4.2-file-format-specifications/4.2.1-concept-file-specification.md)
* [Description File Specification](https://github.com/SNOMED-Documents/snomed-release-file-specification/blob/main/4%20component-release-files-specification/4.2%20file-format-specifications/4.2.2%20description-file-specification)
* [Relationship File Specification](/snomed-ct-specifications/snomed-ct-release-file-specification/component-release-file-specification/4.2-file-format-specifications/4.2.3-relationship-file-specification.md)
* [Identifier File Specification](/snomed-ct-specifications/snomed-ct-release-file-specification/component-release-file-specification/4.2-file-format-specifications/4.2.4-identifier-file-specification.md)
* [Transitive Closure Files](/snomed-ct-specifications/snomed-ct-release-file-specification/appendices/appendix-b.-specification-reference-information/t/transitive-closure-file.md)
* [Concrete Value File Specification](/snomed-ct-specifications/snomed-ct-release-file-specification/component-release-file-specification/4.2-file-format-specifications/4.2.6-concrete-value-file-specification.md)

{% hint style="info" %}
A SQL schema, which represents the content of each of the files specified in the section as a relational table, is provided in the [SNOMED CT - SQL Practical Guide](https://docs.snomed.org/snomed-ct-practical-guides/snomed-ct-sql-practical-guide/)
{% endhint %}

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