> ## Documentation Index
> Fetch the complete documentation index at: https://omss.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Reserved Namespaces

> A list of reserved namespaces and their respective value order.

This page lists all reserved namespaces in OMSS Core, along with the order of values that are allowed in each namespace. Reserved namespaces are used to ensure that certain identifier values are unique and consistent across all OMSS Core implementations. The following namespaces are currently reserved:

## TMDB

Website: [https://www.themoviedb.org/](https://www.themoviedb.org/)

* Movie: `tmdb:<movie_id>` - e.g., `tmdb:329865` for [https://www.themoviedb.org/movie/329865-arrival](https://www.themoviedb.org/movie/329865-arrival)
* TV Episode: `tmdb:<show_id>:<season>:<episode>` - e.g., `tmdb:87108:1:4` for [https://www.themoviedb.org/tv/87108-chernobyl/season/1/episode/4](https://www.themoviedb.org/tv/87108-chernobyl/season/1/episode/4)

<Note>All values must be natural numbers (≥ 1), except `season_number` which may be `0` (specials).</Note>

## IMDb

Website: [https://www.imdb.com/](https://www.imdb.com/)

* Movie: `imdb:tt<digits>` - e.g., `imdb:tt2543164` for [https://www.imdb.com/title/tt2543164/](https://www.imdb.com/title/tt2543164/)
* TV Episode: `imdb:tt<digits>` - e.g., `imdb:tt36428159` for [https://www.imdb.com/title/tt36428159/](https://www.imdb.com/title/tt36428159/)

<Note>Valid IDs consist of the prefix `tt` followed by exactly seven digits.</Note>

## Anime

<Warning>
  We will add more namespaces in the future, including (probably several) reserved namespaces for anime. Sadly the anime field is pretty vast and I don't have the time to research which ID-Provider is the most used/stable.

  I would like to invite the community to help me with this. If you have a suggestion for a good anime ID-Provider, please reach out to here: [omss-spec/docs#1](https://github.com/omss-spec/docs/issues/1)
</Warning>


## Related topics

- [Glossary and Terminology](/core/explanation/glossary.md)
- [OMSS IDs](/core/explanation/omss-id.md)
- [OMSSId](/sdk-artifacts/types/OMSSId.md)