[xsl] Recursion

[kakridge@xxxxxxxxxxxxx]

I'm having a little trouble with recursion and could use some guidance
please.

My basic XML is this:

<Root>
	<Child1>
		<Dates>
			<StartDate>..here is a date/time</StartDate>
			<EndDate>..here is a date/time</EndDate>
		</Dates>
	</Child1>
	<Child2>
		....same type of children
	</Child2>
		...
		...
		...


I would like to basically get the duration between each StartDate and
EndDate, and get a total sum of those durations.

Here is my current code:

...
...
<xsl:call-template name="totalHours">
	<xsl:with-param select="Dates/DateSpan/StartDate"
name="startDate"/>
	<xsl:with-param select="Dates/DateSpan/EndDate" name="endDate"/>
</xsl:call-template> ... ...



<xsl:template name="totalHours">
  	<xsl:param name="startDate"/>
  	<xsl:param name="endDate"/>
 	<xsl:variable name="duration">
		<xsl:call-template name="date:difference">
			<xsl:with-param name="start"
select="$startDate"/>
			<xsl:with-param name="end" select="$endDate"/>
		</xsl:call-template>
	</xsl:variable>
    <xsl:choose>
      <xsl:when test="$duration">
        <xsl:variable name="recursive_result">
          <xsl:call-template name="totalHours">
            <xsl:with-param name="start" select="$startDate[position()
&gt;  1]"/>
			<xsl:with-param name="end"
select="$endDate[position() &gt; 1]"/>
          </xsl:call-template>
		</xsl:variable>
        <xsl:value-of select="date:add-duration(0 +
$recursive_result)"/>
 		</xsl:when>
      <xsl:otherwise>
      	<xsl:value-of select="0"/>
      </xsl:otherwise>
  </xsl:choose>
</xsl:template>

I'm currently getting an error saying that 'startDate should contain a
node-set'.

I appreciate any help.


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