Can't change style of retrieve-marker in header

Hi

While tinkering with the header.content template I hit upon a problem where I can't control the style used to render a retrieve-marker.  As the example shows below I can demonstrate the problem by outputting text and the marker text.  But when rendered the header shows the text in a plain style while the marker is shown in bold.

          <xsl:when test="$position='left'">
                <xsl:if test="$pageclass != 'titlepage'">
                      <xsl:text>Section - </xsl:text>
                                  <fo:retrieve-marker retrieve-class-name="section.head.marker"
                                          retrieve-position="first-including-carryover"
                                          retrieve-boundary="page-sequence"/>
                </xsl:if>
              </xsl:when>

What I really want to do is change the style that the marker is output as, but I can't seem to find anything that will change it; I have managed to change the rest of the header but not the marker.

Thanks in anticipation.

Robert Matthews