1 <XPath xmlns:ietf="http://www.ietf.org" > 2 (//.|//@*|//namespace::*) 3 [ 4 self::ietf:e1 5 or 6 (parent::ietf:e1 and not(self::text() or self::e2)) 7 or 8 count(id("E3")|ancestor-or-self::node()) = count(ancestor-or-self::node()) 9 ] 10 </XPath>