foreach ($acls as $acl) {
                    $policy['modAccessContext'][$acl->get('target')][] = array(
                        'principal' => $acl->get('principal'),
                        'authority' => $acl->get('authority'),
                        'policy' => $acl->get('data') ? $this->xpdo->fromJSON($acl->get('data'), true) : array(),