<!--
http://www.w3.org/TR/xmldsig2ed-tests/#c14n11xmlbase-prop-2

Check that implementations of [XML-C14N1.1] properly build the xml:base 
at the first level (ietf:e1).
-->
<XPath xmlns:ietf="http://www.ietf.org" >
(//. | //@* | //namespace::*) 
[ancestor-or-self::ietf:e1]
</XPath>