How do create anchor links in an XSL FO file?

Hi,
I havent been able to find a solution to link the listed chapters in my Table of Contents to the specific chapters later on in the book. Is there a way to do so?

 <fo:flow flow-name="xsl-region-body">

 <fo:block break-after="page" font-size="19pt">
    Table of Contents
<fo:block space-after="7pt"></fo:block>
  <fo:block text-indent="25pt" font-size="11pt" line-height="20pt">
    <xsl:for-each select="book/chapter">
        <xsl:value-of select="title"/><fo:block></fo:block>
    </xsl:for-each>
  </fo:block>
  </fo:block>

        <xsl:apply-templates select="book"/>
     <xsl:apply-templates select="chapter"/>
    </fo:flow>