W3C home > Mailing lists > Public > w3c-ietf-xmldsig@w3.org > July to September 2002

Re: Namespace in the XPath tag

From: Herry <herrykoh@yahoo.com>
Date: Mon, 8 Jul 2002 14:22:25 +0800 (CST)
Message-ID: <20020708062225.89326.qmail@web11408.mail.yahoo.com>
To: Christian Geuer-Pollmann <geuer-pollmann@nue.et-inf.uni-siegen.de>, w3c-ietf-xmldsig@w3.org

Hi Christian,
thanks for the reply. 

When you said 'used namespaces', does it refer to the
namespaces used within the XPath expr? So for any
namespaces used in the XPath expr, they will have to
be declared somewhere that is visible to the XPath
expr. It doesn't matter that the namespace declaration
in the XPath expr is declared in the XPath tag, we can
similarly declare that in the, say, <Transforms> tag
if we want, is that correct.

Just want to clarify as I am still a novice in XPath
:)

Thanks.

Cheers,
Herry


 --- Christian Geuer-Pollmann
<geuer-pollmann@nue.et-inf.uni-siegen.de> wrote: > Hi
Herry,
> 
> In this snippet:
> 
> >  <XPath xmlns:dsig="&dsig;">
> >    not(ancestor-or-self::dsig:Signature)
> >  </XPath>
> 
> the namespace is only declared because the Xpath
> expression in the text 
> node uses the dsig prefix. The XPath element is a
> good place to (re)define 
> namespaces which are used by the xpath expression.
> So it is NOT mandatory 
> to bind the XML Signature namespace in a special
> way. You only have to take 
> care that the used namespaces are defined. (You can
> also do this in the 
> Transforms or the Signature element or even in your
> document element...
> 
> 
> Christian
> 
> --On Montag, 8. Juli 2002 10:56 +0800 Herry
> <herrykoh@yahoo.com> wrote:
> 
> >
> > Hi,
> > in the current XML DSIG specification [1], under
> > section 6.6.3, there is an example of how an XPath
> tag
> > will look like inside a <Signature> tag. I've
> noticed
> > an additional namespace declaration in the XPath
> tag:
> > <XPath xmlns:dsig="&dsig;">.
> >
> > Just want to clarify whether this is mandatory if
> my
> > XPath expression does not involve any Signature
> tags
> > or tags belonging to the Signature namespace.
> >
> > Cheers,
> > Herry
> >
> > [start example below from [1]]
> >
> >  <Document>
> >    ...
> >    <Signature
> > xmlns="http://www.w3.org/2000/09/xmldsig#">
> >      <SignedInfo>
> >       ...
> >        <Reference URI="">
> >          <Transforms>
> >            <Transform
> >
>
Algorithm="http://www.w3.org/TR/1999/REC-xpath-19991116">
> >              <XPath xmlns:dsig="&dsig;">
> >              not(ancestor-or-self::dsig:Signature)
> >              </XPath>
> >            </Transform>
> >          </Transforms>
> >          <DigestMethod
> >
> Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
> >          <DigestValue></DigestValue>
> >        </Reference>
> >      </SignedInfo>
> >      <SignatureValue></SignatureValue>
> >     </Signature>
> >     ...
> >    </Document>
> >
> > [1] http://www.w3.org/TR/xmldsig-core/
> >
> > __________________________________________________
> > Do You Yahoo!?
> > Yahoo! Tech - Get in touch with the latest in
> technology.
> > http://sg.tech.yahoo.com
> >
> 
>  

__________________________________________________
Do You Yahoo!?
Yahoo! Tech - Get in touch with the latest in technology.
http://sg.tech.yahoo.com
Received on Monday, 8 July 2002 02:22:32 UTC

This archive was generated by hypermail 2.4.0 : Friday, 17 January 2020 20:10:10 UTC