<!--
http://www.w3.org/TR/xmldsig2ed-tests/#c14n11xmlbase-prop-3

Check that implementations of [XML-C14N1.1] properly build the xml:base 
if one of intermediate the levels (ietf:e1) are absent from the document 
subset.
-->
<XPath xmlns:ietf="http://www.ietf.org" >
(//. | //@* | //namespace::*)
[ancestor-or-self::ietf:e11]
</XPath>