RE: xslt 2, forward compatibility mode.

XSLT 2.0 allows the [xsl:]version attribute on any element. XSLT 1.0
allows it only on the xsl:stylesheet element or a literal result
element.

Michael Kay

> -----Original Message-----
> From: owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx 
> [mailto:owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx] On Behalf Of Mike Brown
> Sent: 05 March 2003 01:30
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: Re:  xslt 2, forward compatibility mode.
> 
> 
> Michael Kay wrote:
> > Suppose that XSLT 3.0 has just been published, and it 
> includes a new 
> > <xsl:perform-magic> instruction, which is implemented in 
> Saxon version 
> > 19.2, but not yet in MSXML6. You want to invoke this 
> instruction when 
> > your stylesheet is running under Saxon, but when running 
> under MSXML6, 
> > you just want to leave out that part of the output. So you write:
> > 
> > <xsl:template match="thing" version="3.0">
> >   <xsl:perform-magic select="magic-dust">
> >     <xsl:fallback>Sorry, Microsoft don't do magic</xsl:fallback>
> >   </xsl:perform-magic>
> > </xsl:template>
> > 
> > Specifying version="3.0" means that the Microsoft processor (or any 
> > XSLT 1.0 or 2.0 processor) is obliged to execute the xsl:fallback 
> > instruction. If you had said version="1.0" or 
> version="2.0", then the 
> > processor would instead have thrown a static error saying 
> that there 
> > is no such instruction as xsl:perform-magic.
> 
> That does not work.
> 
> % cat fallback.xsl
> <?xml version="1.0" encoding="utf-8"?>
> <xsl:stylesheet version="1.0"
>   xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
> 
>   <xsl:output method="xml" indent="yes"/>
> 
>   <xsl:template match="/" version="3.0">
>     <result>
>       <xsl:perform-magic select="magic-dust">
>         <xsl:fallback>Sorry, we don't do magic</xsl:fallback>
>       </xsl:perform-magic>
>     </result>
>   </xsl:template>
> 
> </xsl:stylesheet>
> 
> % saxon dummy.xml fallback.xsl
> Error at xsl:template on line 7 of 
> file:/opus/home/mike/xml/test/fallback.xsl:
>   Attribute 
> version is not allowed on this element
> Error at xsl:perform-magic on line 9 of 
> file:/opus/home/mike/xml/test/fallback.xsl:
>   Unknown XSLT 
> element: perform-magic
> Transformation failed: Failed to compile stylesheet. 2 errors 
> detected.
> 
> Mike
> 
> -- 
>   Mike J. Brown   |  http://skew.org/~mike/resume/
>   Denver, CO, USA |  http://skew.org/xml/
> 
>  XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list
> 


 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list