I am trying to match values of id  of <author> and affilref of <contactinfo>
and do the transformation as the out shown above.

  <xsl:template match="author">
    <xsl:copy>
      <xsl:apply-templates select="@* | node()"/>
      <xsl:copy-of select="../contactinfo[@affilref = current()/@id"/>
    <xsl:copy>
  </xsl:template>

	Martin Honnen
	http://JavaScript.FAQTs.com/