Re: combining multiple documents

                <!-- But actually we wanted to pass the extra for use  
here in the second instance of "document" -->

If you want to pass that. then pass it as a parameter.


      <xsl:apply-templates
                    select="doc(@file)"/>

don't do that, do this

      <xsl:apply-templates
                    select="doc(@file)/document">
		    <xsl:with-param name="extra"
                    select="key('extra','introduction')"/>
     </xsl:apply-templates>

aand declare this as a parameter to /document (rather than /, hence teh
change in the select above)



   <xsl:template
        match="/document">
   <xsl:param name="extra" select="()"/>


then you can use <xsl:apply-templates select"$extra"/>

wherever you need to use it.


couple of unrelated points

    <xsl:template
        match="/document">
        <xsl:choose>


It's usually simpler to rewrite a template that just consistes of an
xsl:choose as separate templates.

   <xsl:for-each
                    select="key('extra','introduction')">
                    <xsl:apply-templates
                        select="child::node()"/>
    </xsl:for-each>

could more simply be written as

  <xsl:apply-templates  select="key('extra','introduction')/node()"/>

David

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