# Cross References

{% hint style="info" %}
**Cross References** is a section within the "Additional Information" tab applicable to our **standards** and **database** registries only
{% endhint %}

FAIRsharing supports a selection of cross references to other resources. If your resource has an equivalent unique identifier in one of these resources, you can add it in this section. Currently supported cross references are:

* AgroPortal
* BioPortal
* OBO Foundry
* Ontology Lookup Service (OLS)
* re3data
* SciCrunch

If you would like to add a cross reference that isn't on this list, there is an "Other" option.


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://fairsharing.gitbook.io/fairsharing/additional-information/cross-references.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.