Re: [xml] Possible bug : inconsistency between xsl:copy-of, namespaces and xsd validation

[Daniel Veillard <veillard redhat com>]

On Wed, Sep 15, 2004 at 09:50:33AM -0400, Agustín Villena wrote:
> Hi!
>     I'm developing a series of xsl function extensions which implements
> xmldsig signatures. My client need that any transformed document pass
> through a schema validation. I'm using the new XSD schema validation from
> libxml 2.6.13, and libxslt 1.1.10
>
> The next XML is the result of the XSL transformation
>
> <?xml version="1.0" encoding="ISO-8859-1"?>
> <DTE xmlns="http://www.sii.cl/SiiDte";>
>     <Documento ID="T33F100"/>
>     <Signature xmlns="http://www.w3.org/2000/09/xmldsig#"/>
> </DTE>
>
> The "Signature" element was created using xsl:copy-of

  xsl:copy-of what ? in what context ?

> The problem is when I validate the resulting in-memory doc from the
> transformation, the validation fails. I trace back the problem to
>
> xmlschemas.cl, line 13200+
>
> if (child->ns != NULL)
>     nsUri = child->ns->href;
>
> When "child" is the Signature element, the namespace obtained is
> "http://www.sii.cl/SiiDte";, instead of the expected
> http://www.w3.org/2000/09/xmldsig#
[...]
> I traced back the problem to libxslt's transform.c, at the implementation of
> xslCopyOf, more exactly at xsltCopyTree / xmlNewNs part, which seems to not
> copy the namespace declared in the Signature node to the xmlNode's ns field
> (which is the examinated in the schema validation routine), but to node's
> nsDef field
>
> line 1039
> xmlNewNs(copy, (*cur)->href, (*cur)->prefix);
>
>
> Since my limited knowdlege of namespace handling iin libxml, I'm not really
> sure if the problem is in xsl:copy-of or in the namespace checking part of
> XSD validation. Therefor I attach a sample program that exemplifies the
> inconsitency between "in memory" and "from disk" validation of the same
> transformed doc.
>
> Any help will be really appreciated

  Trying to debug a namespace XSLT generation without the stylesheet
producing it is a hopeless task. We need more info !

Daniel

-- 
Daniel Veillard      | Red Hat Desktop team http://redhat.com/
veillard redhat com  | libxml GNOME XML XSLT toolkit  http://xmlsoft.org/
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