Re: [xml] Possible bug in canonicalization

["Mikhail S Grushinskiy" <mgrushinskiy comcast net>]

Elliotte,

It seems this bug was introduced in xmlstarlet. 

mikhail greybox /cygdrive/c/msys/1.0/home/mikhail/XMLSTARLET/libxml2-2.6.5
$ echo "<xml/>" | xml c14n --with-comments -
<xml></xml>
[new line here]
mikhail greybox /cygdrive/c/msys/1.0/home/mikhail/XMLSTARLET/libxml2-2.6.5
$ echo "<xml/>" | ./testC14N.exe --with-comments -
<xml></xml>
mikhail greybox /cygdrive/c/msys/1.0/home/mikhail/XMLSTARLET/libxml2-2.6.5


I will fix it in CVS and I will let you know. 

--MG

----- Original Message ----- 
From: "Elliotte Harold" <elharo metalab unc edu>
To: <xml gnome org>
Cc: <xmlstar-devel lists sourceforge net>
Sent: Sunday, February 08, 2004 3:51 PM
Subject: [xml] Possible bug in canonicalization


> I've encountered a likely bug in libxml's canonicalization. I am using 
> libxml 2.6.5, the latest released version. I probably don't have the 
> latest release of libxslt, though. This is on Red Hat Linux 8. I am not 
> certain of this bug only because I am only accessing canonicalization 
> through xmlstarlet, rather than through my own code. It is possible the 
> problem is in xmlstarlet's interface to libxml2. However, the nature of 
> the bug does mean that if it's in the libxml code it should be easy to 
> spot. Ditto if it's in xmlstarlet.
> 
> In brief, the canonicalization is placing a line feed at the end of the 
> canonicalized document, at least when there are no comments or PIs in 
> the epilog (I haven't tested what happens when there are such nodes in 
> the epilog). According to the canonical XML spec, section 4.3, this is 
> wrong:
> 
> The C14N-20000119 
> <http://www.w3.org/TR/2001/REC-xml-c14n-20010315#C14N-20000119> 
> Canonical XML draft placed a #xA after each PI outside of the document 
> element as well as a #xA after the end tag of the document element. The 
> method in this specification performs the same function except for 
> omitting the final #xA after the last PI (or comment or end tag of the 
> document element). This technique ensures that PI (and comment) children 
> of the root are separated from markup by a line feed even if root node 
> or the document element are omitted from the output node-set.
> 
> --
> Elliotte Rusty Harold
> 
> 
> 
> _______________________________________________
> xml mailing list, project page  http://xmlsoft.org/
> xml gnome org
> http://mail.gnome.org/mailman/listinfo/xml


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