# AccessPolicyRule One operation, selector, and optional assigned resource. ```python from goodmem.models import AccessPolicyRule ``` - `operation` (`Operation | None`, required): Protected operation. - `selector` (`Selector | None`, required): Resource-selection semantics. - `assigned_resource` (`AccessPolicyTarget | None`, optional): Required exactly for EXACT and DIRECT_MEMBERS_OF selectors. JSON: `assignedResource`. [Python](../../python.md) Related types — open only those used by your request: - [AccessPolicyTarget](AccessPolicyTarget.md) - [Operation](Operation.md) - [Selector](Selector.md)