Re: [xml] xpath problem

[Daniel Veillard <veillard redhat com>]

On Wed, Aug 28, 2002 at 10:09:01PM -0700, Aleksey Sanin wrote:
> 
> 
> The problem:
> ===========================================================
> There are two files a.xml and b.xml with a difference of \n in the last 
> line:

yes and at the XPath data model it means the EndUsers node has one more child
which is a text node with the \n

> --- 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

  The behaviour of '(//. | //@* | //namespace::*)' seems okay, it
selects 11 nodes on a.xml and 10 on b.xml . But the fact that 
EndUser get selected in the expression in b.xml is a bug clearly :-(

Daniel

-- 
Daniel Veillard      | Red Hat Network https://rhn.redhat.com/
veillard redhat com  | libxml GNOME XML XSLT toolkit  http://xmlsoft.org/
http://veillard.com/ | Rpmfind RPM search engine http://rpmfind.net/