# unknown

### Description

Create a condition for when a certain piece of [information](https://docs.atfinity.io/guides/glossary/information) is unknown.

### Example

If you want to trigger a warning when a person's domicile has not yet been registered in the [case](https://docs.atfinity.io/guides/glossary/case), attach this condition to the warning:

```
p is Person
p.is_pep is unknown
```