<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                version="1.0"
                >


<xsl:template match="item">
<xsl:value-of select="@id"/>:
<xsl:apply-templates select="." mode="sum"/>
</xsl:template>

<xsl:template match="item" mode="sum">
<xsl:param name="x" select="0"/>
<xsl:choose>
<xsl:when test="dependson=0">
<xsl:value-of select="$x+data"/>
</xsl:when>
<xsl:otherwise>
<xsl:apply-templates select="../item[@id=current()/dependson]" mode="sum">
  <xsl:with-param name="x" select="$x+data"/>
</xsl:apply-templates>
</xsl:otherwise>
</xsl:choose>
</xsl:template>

</xsl:stylesheet>

_____________________________________________________________________
This message has been checked for all known viruses by Star Internet
delivered through the MessageLabs Virus Scanning Service. For further
information visit http://www.star.net.uk/stats.asp or alternatively call
Star Internet for details on the Virus Scanning Service.

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list