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

SpiceDB

Hi, given the schema:
```
definition group {
    relation owner: user
    relation member: user | group#member

    permission can_edit = owner
    permission can_view = owner + member
}
```
Any ideas on how to create a relationship `groupA#member@groupB#member`, using the authzed client libs?

If I try a subject with id `groupB`, I get:
`… object_id:"groupB" is not allowed as the subject of namespace …`

If I try a subject with id `groupB#member`, I get:
```
message failed validation 
| caused by: invalid Relationship.Subject: embedded message failed validation 
| caused by: invalid SubjectReference.Object: embedded message failed validation |
 caused by: invalid ObjectReference.ObjectId: value does not match regex pattern "^(([a-zA-Z0-9_][a-zA-Z0-9/_|-]{0,127})|\\*)$
```