# AccessPolicyRule One operation, selector, and optional assigned resource. - `operation` (`Operation`, required): Protected operation. - `selector` (`Selector`, required): Resource-selection semantics. - `assignedResource` (`AccessPolicyTarget | null`, optional): Required exactly for EXACT and DIRECT_MEMBERS_OF selectors. [TypeScript](../../typescript.md) Related types — open only those used by your request: - [AccessPolicyTarget](AccessPolicyTarget.md) - [Operation](Operation.md) - [Selector](Selector.md)