SpiceDB is an open source, Google Zanzibar-inspired, database system for creating and managing security-critical application permissions.

SpiceDB

If we look at an example schema like:
```definition document {
  relation parent: organization
  relation required_status: status

  permission read = parent->read & required_status->is_member
}```

If the document we're checking the permission on doesn't have a relationship with a status, what is the default behavior?

If there a way to only enforce the `required_status->is_member` check if the document entity *has* a status relationship defined with some status object?