How to get ulink URLs into foonotes?

Hi again,

I faced another problem when producing PDF. I've set 

<xsl:param name="ulink.show" select="0"></xsl:param>

and this works fine. But 

<xsl:param name="ulink.footnotes" select="'1'"></xsl:param>

has no effect at all. There are no such footnotes in the generated PDF
(while footnotes inserted with <footnote> naturally are).

What am I missing or doing wrong?

Toolchain:

SuSE Linux 8.1
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2-b28)
Xalan Java 2.4.1
docbook-xsl-1.62.0
Apache fop-0.20.4

Regards,
Gisbert Amm
http://web.de/