self::ietf:e1 or (parent::ietf:e1 and not(self::text() or self::e2)) or count(id("E3")|ancestor-or-self::node()) = count(ancestor-or-self::node())ikiFWJqYGPEfpO8QMolig+16++M=8c5Lodw38ksKmCwl/via/To9VM0=