[xsl] fo:basic-link to non-pdf file

[Mark Wilson <mark@xxxxxxxxxxxx>]

Hello,
I have been linking PDFs together for some time now, using both 
internal- and external- destination attributes.  Is it possible to go 
from a pdf document to an html file in the same directory? I've tried 
several variations, but when I hold my cursor over the link in the PDF 
document, it always reports as the address:
    resource://pdf.js/web/
and it does nothing when clicked.

My target is:
    concat(lower-case(@file-by), '.htm')

I have formulated the external-destination as:
<fo:basic-link>
    <xsl:attribute name="external-destination" 
select="concat(lower-case(@file-by), '.htm')"/>
    <xsl:value-of select="@data"/>
</fo:basic-link>

and as (the method I use to connect to another PDF document):
<fo:basic-link>
    <xsl:attribute name="external-destination">
           <xsl:text>url("</xsl:text>
           <xsl:value-of select="concat(@file-by, '.htm')"/>
            <xsl:text>")</xsl:text>
      </xsl:attribute>
    <xsl:value-of select="@data"/>
</fo:basic-link>

What is the correct method, if any?
Thanks,
Mark

--
Mark Wilson
Knihtisk Publishing