How to add vertical space before the start of footnotes?

[Erik Leunissen <e.leunissen@hccnet.nl>]

In order to increase the space between regular text and the start of 
footnotes in PDF output, I've tried:

- add "space-before.*" attributes in the attribute set 
"footnote.sep.leader.properties"
- customize the "footnote-separator" template (please see below).

None of them had any effect.

Can this be done? If so, I'd appreciate very much some directions.


Thanks in advance,

Erik.
--
<xsl:template name="footnote-separator">
  <fo:static-content flow-name="xsl-footnote-separator">
    <fo:block space-before.optimum="3.0em"
              space-before.minimum="2.8em"
              space-before.maximum="3.2em"/>
    <fo:block>
      <fo:leader xsl:use-attribute-sets="footnote.sep.leader.properties"/>
  </fo:block>
  </fo:static-content>
</xsl:template>