RE: sum of products

Actually that is not entirely true, since I've done just that without a
named template to do the work. But it is recursive. Given your data and the
following:

<?xml version="1.0"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
	<xsl:param name="dataid" select="'2'"/>
	<xsl:output method="text" indent="no" />
	<xsl:template match="/items">
		<xsl:apply-templates select="(item/data[@id=$dataid])[1]"/>
	</xsl:template>
	<xsl:template match="data">
		<xsl:param name="pSum" select="0"/>
		<xsl:variable name="lSum" select="$pSum + (number(a) *
number(b))"/>
		<xsl:variable name="remaining"
select="(following-sibling::data |
parent::item/following-sibling::item/data[@id=$dataid])"/>
		<xsl:choose>
			<xsl:when test="count($remaining) &gt; 0">
				<xsl:apply-templates select="$remaining[1]">
					<xsl:with-param name="pSum"
select="$lSum"/>
				</xsl:apply-templates>
			</xsl:when>
			<xsl:otherwise>
				<xsl:call-template name="done">
					<xsl:with-param name="pSum"
select="$lSum"/>
				</xsl:call-template>
			</xsl:otherwise>
		</xsl:choose>
	</xsl:template>
	<xsl:template name="done">
		<xsl:param name="pSum" select="0"/>
		<xsl:text>The Sum of the Products of data items with @id =
</xsl:text>
		<xsl:value-of select="$dataid"/>
		<xsl:text> is:</xsl:text>
		<xsl:value-of select="$pSum"/>
	</xsl:template>
</xsl:stylesheet>


I got the following output:

The Sum of the Products of data items with @id = 2 is:310

There may be a better way that to use the variable remaining but I built
this pretty quickly. By the way, the select for $remaining is written so
that you could have multiple datas with the same id in one item. 

Adam

> -----Original Message-----
> From: David Carlisle [mailto:davidc@xxxxxxxxx]
> Sent: Wednesday, October 10, 2001 6:00 AM
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: Re:  sum of products
> 
> 
> 
> > Is there another method that does not use node-set?
> 
> yes write a recursive named template that accumulates the sum,
> there's examples in this list archives, if not the faq.
> basically just add a*b to the value passed in as the 
> parameter then call
> yourself on a following node, passing on this new value.
> 
> David
> 
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