> For the complete documentation index, see [llms.txt](https://adidas.gitbook.io/api-guidelines/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://adidas.gitbook.io/api-guidelines/rest-api-guidelines/evolution/reserved-identifiers.md).

# Reserved Identifiers

The list of all reserved identifiers or identifiers with special meaning.

## Representation Format Fields

* `_links` - [HAL](/api-guidelines/rest-api-guidelines/message/hal.md)
* `_embedded` - [HAL](/api-guidelines/rest-api-guidelines/message/hal.md)

## Query Parameters

* `fields`- [Choosing Fields & Embedded Resources](/api-guidelines/rest-api-guidelines/execution/choosing-fields-and-embedded-resoruces.md)
* `embedded` - [Choosing Fields & Embedded Resources](/api-guidelines/rest-api-guidelines/execution/choosing-fields-and-embedded-resoruces.md)
* `offset` - [Pagination](/api-guidelines/rest-api-guidelines/execution/pagination.md) 
* `limit`- [Pagination](/api-guidelines/rest-api-guidelines/execution/pagination.md)