On Fri, Dec 28, 2012 at 8:38 AM, Chris Maloney <voldrani@xxxxxxxxx> wrote:
> As for a work-around, the following works with xsltproc, but
> interestingly, not with Saxon.  Saxon complains "key() function cannot
> be used here".  (This is a variant of the XSLT that Dimitre posted on
> SO):
>
>
>     <xsl:stylesheet version="1.0"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
>       <xsl:output omit-xml-declaration="yes" indent="yes"/>
>
>       <xsl:key name='kTagUsage' match='tagUsage' use='@render'/>
>       <xsl:key name="kRendByUsageGi" match="rendition"
>         use="key('kTagUsage', @xml:id)/@gi"/>
>
>       <xsl:template match="/">
>         <xsl:copy-of select="key('kRendByUsageGi', 'p')/text()"/>
>         ========
>         <xsl:copy-of select="key('kRendByUsageGi', 'emph')/text()"/>
>       </xsl:template>
>     </xsl:stylesheet>
>

There is a "slight" difference: I didn't use key() inside the
expression in the "use"  attribute (I believe the error is raised to
prevent cirkular key definition) -- and the below transformation is
working with Saxon:

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output omit-xml-declaration="yes" indent="yes"/>

 <xsl:key name="kRendByUsageGi" match="rendition"
  use="../tagUsage[@render=current()/@xml:id]/@gi"/>

 <xsl:template match="/">
  <xsl:copy-of select="key('kRendByUsageGi', 'p')/text()"/>
========
  <xsl:copy-of select="key('kRendByUsageGi', 'emph')/text()"/>
 </xsl:template>
</xsl:stylesheet>


Cheers,

Dimitre