> For the complete documentation index, see [llms.txt](https://docs.b2ihealthcare.com/snow-owl-authoring-platform/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.b2ihealthcare.com/snow-owl-authoring-platform/concept-model/machine-readable-concept-model/concept-model-constraints.md).

# MRCM domain members

MRCM domains are represented by members in MRCM domain reference set type reference sets. The referenced component of a domain member is selected as the most descriptive concept of the set of concepts defined by its Domain constraint.

Its domain constraint can be described by an ECL expression.

The referenced concept is used to link the domain definition to its allowed attributes in the MRCM attribute domain type reference sets.

<figure><img src="/files/NvEOk8fXn5H7SO3nYz3V" alt=""><figcaption><p>MRCM domain members</p></figcaption></figure>

For more information regarding MRCM domain members see the [official documentation](https://confluence.ihtsdotools.org/display/DOCMRCM/5.1+MRCM+Domain+Reference+Set).


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## 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, and the optional `goal` query parameter:

```
GET https://docs.b2ihealthcare.com/snow-owl-authoring-platform/concept-model/machine-readable-concept-model/concept-model-constraints.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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.