> ## 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>

<Tip>
  We suggest using TMDB to request Anime. If you are looking for a map of different Anime IDs of different ID-Providers to TMDB, [check out this cool list](https://github.com/Fribb/anime-lists).
</Tip>

## 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>


## Related topics

- [Glossary and Terminology](/core/misc/glossary.md)
- [OMSS IDs](/core/explanation/omss-id.md)