> <xsl:template match="//SLIDE">
>      <xsl:variable name="extension">.html</xsl:variable>
>      <xsl:for-each select="document(@REF)/*">
>           <xsl:call-template name="Slide">
>                <xsl:with-param name="$extension"/>
>                <xsl:with-param name="$right"/>
>           </xsl:call-template>
>      </xsl:for-each>
> </xsl:template>
> </xsl:stylesheet>

The name attribute of xsl:with-param must be a QName. $extension and $right
are not QNames, they are expressions. Perhaps you want <xsl:with-param
name="extension" select="$extension"/>

Mike Kay


 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list