# Reference Set Type

The [I OWL expression type reference set|](http://snomed.info/id/762676003) represents components and their associations to OWL expressions, e.g. definitions specified in OWL expressions for concepts, or information about OWL ontologies of SNOMED CT. This new type of reference set follows the pattern for annotation type reference set, but the content are not mixed with other types of annotations. The new refset supports accurate representation for feeding data into Description Logic reasoners, validation of OWL expressions, and creation of OWL ontologies for SNOMED CT.

<a href="https://docs.google.com/forms/d/e/1FAIpQLScTmbZIf0UEQwYDkY27EEWBkaiYkHSbR0_9DmFrMLXoQLyL7Q/viewform?usp=pp_url&#x26;entry.1767247133=OWL+Specification&#x26;entry.670899847=Reference%20Set%20Type" class="button primary">Provide Feedback</a>


---

# 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://docs.snomed.org/snomed-ct-specifications/snomed-ct-owl-reference-set-specification/design-considerations/2.1-reference-set-type.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.