[xsl] design ideas? exploiting variables

[Bruce D'Arcus <bdarcus@xxxxxxxxxxxxx>]

I'm reworking my citation stylesheets to be more dependent on 
variables.  I have it now working quite nicely with one piece of the 
problem: the bibliographic list.  It's all handled in variables apart 
from the main document, such that printing it is as simple as:

          <div id="bibliography">
            <xsl:copy-of select="$formatted-biblist"/>
          </div>

.... and writing out the raw modsCollection is as easy as:

    <xsl:if test="$biboutfile">
      <xsl:result-document href="{$biboutfile}">
        <xsl:copy-of select="$raw-biblist"/>
      </xsl:result-document>
    </xsl:if>

My question is, what might be a good way to approach an output driver 
system?

So, my current code is oriented towards xhtml output.  But I want to be 
able to write simple simple output drivers for other formats that just 
takes the content in the formatted-biblist variable (which is just 
xhtml) and transforms it (into, for example, TeX or WordML).

So, if I have a stylesheet for my document that output TeX code, I want 
to be able to include/import my stylesheet -- I guess with an output 
format parameter? -- and have it return the bibliography and citations 
for the correct output format.

How should I approach that?

Bruce