Re: [xml] xsltproc, xsl:version, and alternate prefixes

[Daniel Veillard <veillard redhat com>]

On Thu, May 31, 2007 at 12:03:04AM -0400, Fred L. Drake, Jr. wrote:
> I have a stylesheet that starts this way:
> 
>   <xs:stylesheet
>       xmlns="http://www.w3.org/1999/xhtml";
>       xmlns:xs="http://www.w3.org/1999/XSL/Transform";
>       xs:version="1.0">
> 
> This used to work just fine with xsltproc, as of a year or more ago.  I'm not 
> sure what version I used to use, but it was probably whatever was packaged in 
> Ubuntu at the time.
> 
> This evening I went to use that transform again, and it didn't work.  I got 
> this error message:
> 
>   compilation error: file /home/fdrake/projects/.../xform.xsl line 4 element 
> stylesheet
>   xsl:version is missing: document may not be a stylesheet
> 
> I checked the specification (1.0, 1.1, 2.0), and it's quite clear that this is 
> processed in the usual way regarding the namespaces specification.  The 
> output file seems to be generated without any problems, so I'm unsure why 
> there's any output claiming an error.

  the version attribute should not have a namespace
    http://www.w3.org/TR/xslt#stylesheet-element

 And the rule is set in the preceeding paragraph:
 http://www.w3.org/TR/xslt#xslt-namespace

 "An element from the XSLT namespace may have any attribute not from the XSLT namespace, provided that the expanded-name of the attribute has a non-null namespace URI. The presence of such attributes must not change the behavior of XSLT elements and functions defined in this document."

  so basically per the spec the 
    xs:version 
attribute is ignored, leading to the compilation layer complaining about it
being missing.

> Running "xsltproc --version" gives me:
> 
>   Using libxml 20627, libxslt 10120 and libexslt 813
>   xsltproc was compiled against libxml 20627, libxslt 10120 and libexslt 813
>   libxslt 10120 was compiled against libxml 20627
>   libexslt 813 was compiled against libxml 20627
> 
> This is a stock install on Ubuntu 7.04.

  I guess older version were more lax about namespacing of attributes,

> Any ideas?  I hate ignoring error conditions, but this seems totally bogus.

  The error sounds right to me except maybe the message should avoid 
adding a prefix.
  Just fix your stylesheet by removing the 'xs:' prefix for version attribute.

Daniel

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