SXLST vs. XLST: Some practical questions

Hello,
I'd like to figure out the power of SXLST. Therefor I read the paper  
(http://okmij.org/ftp/papers/SXSLT-talk.pdf) where  a lot of convincing 
arguments are listed (pro SXLST and against XLST). I am particularly 
interested in the effect of "my-ss" in
(pre-post-order doc my-ss)
As far as I understand "my-ss" is a list of cons (<tag> . <function>). 
Thus the <function> is applied to a node of the sxml-tree whenever the 
tag-name matches <tag>. But what if I want some more context sensitive 
matching inside "my-ss".
Take for instance the following XLST snipet:

  <xsl:template match="elem1/[elem2/@key='value']">
    <xsl:copy-of select="//elem3[@id=current()/elem4]/*"/>
  </xsl:template>

Essentially the question is how this pre-post-order function works 
together with SXPAth?! Where can I learn more about it (not just SXPATH 
on its own)?

Thanks,
Immanuel Normann



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