class AccessControl:
    def __init__(self):
        self._roles = {}

    def grant(self, user_id: str, role: str) -> None:
        self._roles[user_id] = role

    def has_role(self, user_id: str, role: str) -> bool:
        return self._roles.get(user_id) == role


class Governance:
    def __init__(self):
        self.policies = {}

    def register_policy(self, name: str, policy: dict) -> None:
        self.policies[name] = policy

    def get_policy(self, name: str):
        return self.policies.get(name)