Here is a short XLST XML stylesheet translation for trasfoming from
darcs changelog to docbook revision history form.

::

    <?xml version="1.0" encoding="utf-8"?>
    <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                    version="1.0">
    
      <xsl:output method="xml"/>
    
      <xsl:template match="/">
        <revhistory>
          <xsl:for-each select="changelog/patch">
            <revision>
              <revnumber><xsl:number value="position()" format="1" /></revnumber>
              <date><xsl:value-of select="@local_date"/></date>
              <authorinitials><xsl:value-of select="@author"/></authorinitials>
              <revremark><xsl:value-of select="name"/></revremark>
            </revision>
          </xsl:for-each>
        </revhistory>
      </xsl:template>
    
    </xsl:stylesheet>

If you save the above as darcs2docbook.xsl and have
`xsltproc <http://xmlsoft.org/XSLT/xsltproc2.html>`_ installed you
could use it like this:

::

    darcs changes --xml-output --reverse > darcs.xml
    xsltproc darcs2docbook.xsl darcs.xml > revs.xml