[xml] xpath problem

[Aleksey Sanin <aleksey aleksey com>]

Hi, Daniel!

One of XML Security Library customers reported a strange problem  with 
XPath. It's quite late
here and I am not absolutelly sure but it looks like a bug. If it is 
possible, will you take a look, please?

Thank you in advance,
Aleksey.



The problem:
===========================================================
There are two files a.xml and b.xml with a difference of \n in the last 
line:
--- a.xml ---
<?xml version="1.0"?>
<EndUsers><EndUser Id="aaa"><Version>1.0</Version>
</EndUser>
</EndUsers>
--- b. xml ---
<?xml version="1.0"?>
<EndUsers><EndUser Id="aaa"><Version>1.0</Version>
</EndUser></EndUsers>
-------------
And there is an XPath expression:
(//. | //@* | //namespace::*) [ (ancestor::node() = 
/EndUsers[1]/child::EndUser[ Id='aaa']) ]

The expected result is that this expression selects all childs of the 
EndUser node with
Id attribute equal to 'aaa' (I know that it's ugly because the Id 
attribute selected w/o node :) ).  
However, it should work! But running this expression on these two files 
gives different results
(correct result in the a.xml case and wrong result in the b.xml case):

[aleksey shell dd]$ ./testXPath --debug -f test.xpath -i a.xml
========================
Expression: (//. | //@* | //namespace::*)[(ancestor::node() = 
/EndUsers[1]/child::EndUser[ Id='aaa'])]
Object is a Node Set :
Set contains 6 nodes:
1  ATTRIBUTE Id
   TEXT
     content=aaa
2  ELEMENT Version
3  TEXT
   content=1.0
4  TEXT
   content=
5  namespace xml href=http://www.w3.org/XML/1998/namespace
6  namespace xml href=http://www.w3.org/XML/1998/namespace

[aleksey shell dd]$ ./testXPath --debug -f test.xpath -i b.xml
========================
Expression: (//. | //@* | //namespace::*)[(ancestor::node() = 
/EndUsers[1]/child::EndUser[ Id='aaa'])]
Object is a Node Set :
Set contains 8 nodes:
1  ELEMENT EndUser
   ATTRIBUTE Id
     TEXT
       content=aaa
2  ATTRIBUTE Id
   TEXT
     content=aaa
3  ELEMENT Version
4  TEXT
   content=1.0
5  TEXT
   content=
6  namespace xml href=http://www.w3.org/XML/1998/namespace
7  namespace xml href=http://www.w3.org/XML/1998/namespace
8  namespace xml href=http://www.w3.org/XML/1998/namespace