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=JkiQuxT/PO7b81VIIhI5WMcfYMo=