Re: [xml] Question regarding xmlAddId

[nitin singh <xml_prgrm yahoo com>]

Hello Eric,
the closest solution to you problem is the function
xmlSecAddIDs, this function was written for the local 
Ids but  If you understand the code,your problem
for global Ids is solved as well, with a minor
modification.
hope this helps....
Nitin.

--- Daniel Veillard <veillard redhat com> wrote:

> On Thu, Nov 11, 2004 at 02:10:05PM +0100, Erik F.
> Andersen wrote:
> > Hello!
> >
> > I'm having some problems using xmlAddId. My
> problem is that I need to sign documents
> > using XMLSEC and the wsu:Id-attribute (in
> soap:Body below) cannot be found by 
> > xpointer unless I add a DTD. I have been told
> however that one should not (may not?) 
> > use a DTD in SOAP documents and that is the reason
> why I want to use xmlAddId. 
>
>   yes the XML Protocol WG screwed up on this (IMHO),
> and whoever designed
> the format you are using requiring an Id of type ID
> on a soap:Body just failed
> too. I don't know who, where or why, but this is
> clearly broken from
> the start since SOAP and DTDs are by the SOAP spec
> incompatible.
> I repeat again: your framework is broken.
>
> > Below is the XML that I try to sign but I haven't
> been able to find a call to xmlAddId 
> > that will work. The DTD look like this:
> >
> > <!DOCTYPE soap:Envelope [
> > <!ATTLIST soap:Body Id ID #IMPLIED>
> > ]>
> >
> > What should I use for xmlAttrPtr and what should I
> use for "value" to xmlAddId in order
> > to replace the DTD? 
>
>   It does not replace the DTD. You need to call 
> xmlAddID() on all 
> Id attributes carried by soap:Body elements in the
> document, passing
> the document, the attribute and the string value for
> the ID.
>
> > I have tried every combination that I could think
> of. 
> > Another strange thing is that apparently I have to
> reload the whole tree before 
> > xpointer will "see" the wsu:Id attribute. I think
> this is because I build the whole
> > tree in code and there is a problem (bug?) in
> XMLLIB regarding DTD's. 
>
>   Well if you start blaming libxml2 while you don't
> seems to understand
> fully what you are doing, and without providing a
> reproductible test case,
> communication between us is likely to deteriorate
> extremely quickly...
>
> > Thanks for your help,
> >
> > Erik F. Andersen
> >
> >
> > <?xml version="1.0"?>
> > <soap:Envelope
xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/";
> > xmlns:xsd="http://www.w3.org/2001/XMLSchema";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
> >  <soap:Header>
> >   <wsse:Security
xmlns:wsse="http://schemas.xmlsoap.org/ws/2002/07/secext";
> >   soap:mustUnderstand="1">
> >    <Signature
> xmlns="http://www.w3.org/2000/09/xmldsig#";>
> >      <SignedInfo>
> >       <CanonicalizationMethod
Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
> >       <SignatureMethod
Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/>
> >        <Reference
> URI="#Id-058b5a86-a1dd-4188-9920-8315c3f84eae">
> >         <Transforms>
> >          <Transform
Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
> >         </Transforms>
> >         <DigestMethod
> Algorithm="http://www.w3.org/2000/09/xmldsig#sha1";
> /> 
> >         <DigestValue /> 
> >        </Reference>
> >      </SignedInfo>
> >     </Signature>
> >    </wsse:Security>
> >   </soap:Header>
> >   <soap:Body
xmlns:wsu="http://schemas.xmlsoap.org/ws/2002/07/utility";
> >   
> wsu:Id="Id-058b5a86-a1dd-4188-9920-8315c3f84eae">
> >   </soap:Body>
> > </soap:Envelope>
>
>   You can build XPointer expression selecting the
> node you want without
> requiring the attribute to be of type ID, of course
> it's more complex !
>
> paphio:~/XML -> ./testXPath --xptr -i tst.xml
'xmlns(soap=http://schemas.xmlsoap.org/soap/envelope/)xmlns(wsu=http://schemas.xmlsoap.org/ws/2002/07/utility)xpointer(//soap:Body[
 wsu:Id="Id-058b5a86-a1dd-4188-9920-8315c3f84eae"])'
> Object is a Node Set :
> Set contains 1 nodes:
> 1  ELEMENT soap:Body
>     namespace wsu
> href=http://schemas.xmlsoap.org/ws/2002/07/ut...
>     ATTRIBUTE Id
>       TEXT
>        
> content=Id-058b5a86-a1dd-4188-9920-8315c3f84eae
> paphio:~/XML ->
>
> Daniel
>
> -- 
> Daniel Veillard      | Red Hat Desktop team
> http://redhat.com/
> veillard redhat com  | libxml GNOME XML XSLT toolkit
>  http://xmlsoft.org/
> http://veillard.com/ | Rpmfind RPM search engine
> http://rpmfind.net/
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