RE: Re: EXSL's dyn:evaluate() and XALAN vs. xsl:use-at

dyn:evaluate() is an XPath expression, so you can use it anywhere an
XPath expression is allowed, and nowhere else.

Michael Kay

> -----Original Message-----
> From: owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx 
> [mailto:owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx] On Behalf Of 
> raphead@xxxxxxx
> Sent: 22 August 2003 07:10
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: Re:  Re: EXSL's dyn:evaluate() and XALAN vs. 
> xsl:use-attribute-sets
> 
> 
> Hi,
> 
> > According to the XSLT 1.0 spec "The value of the use-attribute-sets 
> > attribute is a whitespace-separated list of names of 
> attribute sets. 
> > Each name is specified as a QName ..."
> > 
> > A QName cannot be calculated dynamically -- it must be known at 
> > compile time.
> 
> I'm aware of that but my understanding of the dyn:evaluate 
> extension is, that is let's say 'on level above the xslt 
> processing'. While reading the spec on exslt.org the 
> following sentence confirmed this somehow:
> 
> ...The string is always evaluated exactly as if it had been 
> literally included in place of the call to the dyn:evaluate function.
> 
> And if you're right, how can one determine for which params 
> etc. dyn:evaluate will work?
> 
> > 
> > 
> > Therefore, what you're trying to achieve is impossible in this way.
> > 
> 
> Do you have an ide, how to achive it? I also tried with 
> chained templates and parameters but then I really stuck with 
> the problem with qnames.
> 
> Thomas
> > 
> > =====
> > Cheers,
> > 
> > Dimitre Novatchev.
> > http://fxsl.sourceforge.net/ -- the home of FXSL
> > 
> > 
> > <raphead@xxxxxxx> wrote in message 
> > news:29467.1061417799@xxxxxxxxxxxxxxxx
> > Hi,
> > 
> > As I don't really like mailinglists it was kind of hard for 
> me do this 
> > step but for my current problem
> > I can't find a proper answer elsewhere:
> > 
> > Suppose I have the following XML document:
> > 
> > ...
> > <elemxy class="test1">Some content</elemxy>
> > ...
> > 
> > And the following template snippet:
> > 
> > ...
> >   <xsl:template match="elemxy">
> >     <fo:block  xsl:use-attribute-sets="dyn:evaluate(@class)">
> >     <xsl:apply-templates/>
> >     </fo:block>
> >   </xsl:template>
> > ...
> > 
> > Obviously I have several different class attributes (like 
> test1 here) 
> > and want them to be the name of an attribute-set. This because: I'm 
> > generating the attribute-sets dynamically
> > and attach them to the xsl stylesheet.
> > 
> > My question is now: Why is the above construct NOT working? 
> I'm using 
> > xalan-j_2_5_1 and my root element of the stylesheet looks like
> > this:
> > 
> > <xsl:stylesheet version="1.0"
> >                 xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
> >                 xmlns:fo="http://www.w3.org/1999/XSL/Format"
> >                 xmlns:xalan="http://xml.apache.org/xalan"
> >                 xmlns:dyn="http://exslt.org/dynamic"
> >                 extension-element-prefixes="dyn">
> > 
> > Xalan simply ignores the statement. When I replace the 
> expression with 
> > a static name the proper attribute-set is used.
> > 
> > Thomas H.
> > With greets from Germany
> > 
> > 
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