> For the complete documentation index, see [llms.txt](https://docs.openagua.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.openagua.org/how-to-use/user-guide/advanced/data-specifications.md).

# OpenAgua data specifications

Data in OpenAgua builds on the data schema of Hydra Platform. Understanding these OpenAgua-specific data specifications is helpful if uploading data via Hydra API.

Hydra enables extensions through the `layout` field of many data objects (or, in the case of template types, the `properties` field). OpenAgua thus uses the `layout` field (and `properties` field) extensively.

## Scenarios

OpenAgua uses the following fields within the `scenario.layout` field:

* `class`: Options include `baseline`, `option`, `portfolio`, `scenario` and `results`.
  * The `baseline` scenario represents the main scenario from which all other scenarios are derived.
  * Scenarios with the `option`, `portfolio` and `scenario` class are shown in their respective parts of the application.
  * Scenarios with the `results` class are available for viewing in the results explorer.

{% hint style="warning" %}
All scenarios in OpenAgua should be classified with layout.class. Unclassified scenarios will not be deleted, but may not be visible.
{% endhint %}