Re: [xslt] Bug(?) in xmlns handling

["Jonathan S. Shapiro" <shap eros-os com>]

On Thu, 2006-11-16 at 13:35 -0500, Daniel Veillard wrote:
> On Thu, Nov 16, 2006 at 12:31:56PM -0500, Jonathan S. Shapiro wrote:
> > This may well be an error in our usage, so I hesitate to post a bug
> > report without confirming. There has been a change in behavior beginning
> > with the fedora libxslt-1.1.18-1 package, but it is likely that our
> > input has always been wrong and it is simply getting "caught" now (which
> > is good).
> > 
> > Problem: We have an XSLT transformer that used to work (but may have
> > been incorrect). It is emitting an SVG tree using the XML output method,
> > and it is trying to wrap part of the output in a namespace tag by doing:
> > 
> >      <xsl:element name="svg">
> >        ...
> > ==>     <xsl:attribute name="xmlns:svg">
> >          <xsl:text>http://www.w3.org/2000/svg</xsl:text>
> >        </xsl:attribute>
> > 
> > Beginning with 1.1.18-1, we get an error at the line indicated by the
> > "==>".
> > 
> >   compilation error: file ../../../../doc/doctools/XSLT/sbox-svg.xsl
> >     line 47 element attribute
> >   xsl:attribute: The prefixed QName 'xmlns:svg' has no namespace binding
> >     in scope in the stylesheet; this is an error, since the namespace
> >     was not specified by the instruction itself.
> > 
> > [lines broken for readability]
> > 
> > I'm not clear if this is a bug in libxslt or if it is a but in our
> > transform script.
> 
>  The latter I guess:
>    http://www.w3.org/TR/xslt#creating-attributes
> 
>   "XSLT processors may make use of the prefix of the QName specified
>    in the name attribute when selecting the prefix used for outputting
>    the created attribute as XML; however, they are not required to do
>    so and, if the prefix is xmlns, they must not do so. Thus, although
>    it is not an error to do:
> 
>    <xsl:attribute name="xmlns:xsl"
>    namespace="whatever">http://www.w3.org/1999/XSL/Transform</xsl:attribute>
> 
>    it will not result in a namespace declaration being output."

Then what is the proper way to emit a namespace declaration.


shap