<!--
http://www.w3.org/TR/xmldsig2ed-tests/#XMLID

Check that implementations of [XML-C14N1.1] handle xml:id attributes 
as defined in [XML-C14N1.1]
-->
<XPath xmlns:ietf="http://www.ietf.org" >
(//. | //@* | //namespace::*)
[ancestor-or-self::ietf:e11 or ancestor-or-self::ietf:e12]
</XPath>