# Common Features of All Release Files

This subsection explains features that apply to all SNOMED CT release files.

* [General Structure of Release Files](/snomed-ct-specifications/snomed-ct-release-file-specification/release-types-packages-and-files/3.1-common-features-of-all-release-files/3.1.1-general-structure-of-release-files.md)
* [Release File Data Types](/snomed-ct-specifications/snomed-ct-release-file-specification/release-types-packages-and-files/3.1-common-features-of-all-release-files/3.1.2-release-file-data-types.md)
* [Fields Present in All Release Files](/snomed-ct-specifications/snomed-ct-release-file-specification/release-types-packages-and-files/3.1-common-features-of-all-release-files/3.1.3-fields-present-in-all-release-files.md)
* [Meaning of the Active Field](/snomed-ct-specifications/snomed-ct-release-file-specification/release-types-packages-and-files/3.1-common-features-of-all-release-files/3.1.4-meaning-of-the-active-field.md)
* [History Mechanism](/snomed-ct-specifications/snomed-ct-release-file-specification/release-types-packages-and-files/3.1-common-features-of-all-release-files/3.1.5-history-mechanism.md)
* [Module Identification](/snomed-ct-specifications/snomed-ct-release-file-specification/release-types-packages-and-files/3.1-common-features-of-all-release-files/3.1.6-module-identification.md)

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