> For the complete documentation index, see [llms.txt](https://docs.atfinity.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.atfinity.io/rule-language/operators/boolean-operators/equal.md).

# =

### Description

`=` compares whether the two elements on either side the operator are equal. This evaluates to either true or false, delivering different outcomes.

If either side contains an information which is unknown, the whole expression becomes unknown.

This operator is also available via the alias `==`.

### Example

```
p is Person
p.domicile = de
```

Adding this to a [document](/guides/glossary/document.md), means that document will only be included in the [case](/guides/glossary/case.md) when the person involved has residency in Germany. When the person lives in Belgium, the document will not show up in the case.


---

# 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:

```
GET https://docs.atfinity.io/rule-language/operators/boolean-operators/equal.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.