public function getSupportedPrivilegeSet(INode $node, array &$supportedPrivilegeSet)
    {
        $ns = '{'.self::NS_CALDAV.'}';
        if ($node instanceof IOutbox) {
            $supportedPrivilegeSet[$ns.'schedule-send'] = [
                'abstract' => false,
                'aggregates' => [
                    $ns.'schedule-send-invite' => [
                        'abstract' => false,
                        'aggregates' => [],
                    ],
                    $ns.'schedule-send-reply' => [
                        'abstract' => false,
                        'aggregates' => [],
                    ],
                    $ns.'schedule-send-freebusy' => [
                        'abstract' => false,
                        'aggregates' => [],
                    ],
                    // Privilege from an earlier scheduling draft, but still
                    // used by some clients.
                    $ns.'schedule-post-vevent' => [
                        'abstract' => false,
                        'aggregates' => [],
                    ],
                ],
            ];
        }
        if ($node instanceof IInbox) {
            $supportedPrivilegeSet[$ns.'schedule-deliver'] = [
                'abstract' => false,
                'aggregates' => [
                    $ns.'schedule-deliver-invite' => [
                        'abstract' => false,
                        'aggregates' => [],
                    ],
                    $ns.'schedule-deliver-reply' => [
                        'abstract' => false,
                        'aggregates' => [],
                    ],
                    $ns.'schedule-query-freebusy' => [
                        'abstract' => false,
                        'aggregates' => [],
                    ],
                ],
            ];
        }
    }