Extra title generated for revhistory

[Xmplar <info@xmplar.biz>]

I have a customization to select either the gentext key or <title> content for <revhistory>. When it's the latter, an additional title is generated after the table head in HTML5, viz:

<div class="revhistory"><table
                style="border-style:solid; width:100%;" class="revhistorytbl">
                <tr>
                  <th style="align: left; valign: top;" colspan="4">Revision history (this
                    book)</th>
                </tr>
                <h1 class="title">Revision history (this book)</h1>
                <tr>
                  <td style="align: left; width: 25%;">Revision 1</td>

Part of the customization of <xsl:template match="d:revhistory" mode="titlepage.mode"> is:
<xsl:variable name="title">
      <xsl:choose>
        <xsl:when test="d:title">
          <xsl:value-of select="d:title"/>
          <!--<xsl:apply-templates select="d:title|d:info/d:title" mode="titlepage.mode"/>-->
        </xsl:when>
        <xsl:otherwise>
          <xsl:call-template name="gentext">
            <xsl:with-param name="key" select="'RevHistory'"/>
          </xsl:call-template>   
        </xsl:otherwise>
      </xsl:choose>
      <!--<xsl:call-template name="gentext">
        <xsl:with-param name="key">RevHistory</xsl:with-param>
      </xsl:call-template>-->
    </xsl:variable>
   
    <xsl:variable name="contents">
      <div>
        <xsl:apply-templates select="." mode="common.html.attributes"/>
        <xsl:call-template name="id.attribute"/>
        <table>
          <!--remove hardcoded style + add class attrib ***works 19/1/13-->
          <!--<xsl:if test="$css.decoration != 0">
            <xsl:attribute name="style">
              <xsl:text>border-style:solid; width:100%;</xsl:text>
            </xsl:attribute>
          </xsl:if>-->
          <xsl:attribute name="class">
            <xsl:value-of select="'revhistorytbl'"/>
          </xsl:attribute>
          <!-- include summary attribute if not HTML5 -->
          <xsl:if test="$div.element != 'section'">
            <xsl:attribute name="summary">
              <xsl:call-template name="gentext">
                <xsl:with-param name="key">revhistory</xsl:with-param>
              </xsl:call-template>
            </xsl:attribute>
          </xsl:if>
          <tr>
            <!--HTML5 attrs added to th 19/1/13-->
            <th style="align: {$direction.align.start}; valign: top;" colspan="{$numcols}">
              <xsl:copy-of select="$title"/>
             
              <!--<strong xmlns:xslo="http://www.w3.org/1999/XSL/Transform">
                <xsl:call-template name="gentext">
                  <xsl:with-param name="key" select="'RevHistory'"/>
                </xsl:call-template>
              </strong>-->
            </th>
          </tr>
          <xsl:apply-templates mode="titlepage.mode">
            <xsl:with-param name="numcols" select="$numcols"/>
          </xsl:apply-templates>
        </table>
      </div>
    </xsl:variable>

So the second title is generated by the <xsl:apply-templates mode="titlepage.mode">. How can I "exclude" the second title?

--
Dave Gardiner