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# Derivation "ATerm" file format
For historical reasons, [derivations](@docroot@/glossary.md#gloss-store-derivation) are stored on-disk in [ATerm](https://homepages.cwi.nl/~daybuild/daily-books/technology/aterm-guide/aterm-guide.html) format.
Derivations are serialised in one of the following formats:
- ```
Derive(...)
```
For all stable derivations.
- ```
DrvWithVersion(<version-string>, ...)
```
The only `version-string`s that are in use today are for [experimental features](@docroot@/development/experimental-features.md):
- `"xp-dyn-drv"` for the [`dynamic-derivations`](@docroot@/development/experimental-features.md#xp-feature-dynamic-derivations) experimental feature.
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