def METHOD_NAME(cmd, client, policy_name, start=None, expiry=None, permission=None, **kwargs):
    """Create a stored access policy on the containing object"""
    t_access_policy = cmd.get_models('_models#AccessPolicy', resource_type=ResourceType.DATA_STORAGE_BLOB)
    acl = _get_acl(cmd, client, **kwargs)
    acl[policy_name] = t_access_policy(permission, expiry, start)
    if hasattr(acl, 'public_access'):
        kwargs['public_access'] = getattr(acl, 'public_access')
    return _set_acl(cmd, client, acl, **kwargs)