How to get the sum of values in attributes in xslt - xslt

Question

I am trying to get the sum. Here is the xslt code.
<xsl:template match="Entry">
<xsl:if test="position() <= 10">
<tr>
<td>
<xsl:value-of select="substring-before(#Value,'||')"/>
</td>
<td>
<xsl:value-of select="format-number(substring(substring-after(#Value,'||||'),1,10),'#.#')"/>
</td>
</tr>
</xsl:if>
</xsl:template>
above code will fillter data as two coloums. It is ok. Now I need to get the sum of <xsl:value-of select="format-number(substring(substring-after(#Value,'||||'),1,10),'#.#')"/>
I am from procedural programming. I read many articles but I still coudnt figure out that how to get the sum of this. can anybody help me?
Here is the xml
<TopHoldings Currency="xxx">
<Entry Type="CName||C||S||Fund Weight (%)||Benchmark weight (%)" Value="Ab||U||||1.2170000000000||" Date="8/31/2011" />
here is the whole xslt
<table style="width:50%;font-size:12px;" cellspacing="0" cellpadding="0">
<tr style="width:50%; text-align:left;background-color:E6F1F9;">
<th> </th>
<th> % of funds </th>
</tr>
<xsl:apply-templates select="$items">
<xsl:sort select="format-number(substring(substring-after(#Value,'||||'),1,10),'#.#')" order="descending"/>
<xsl:sort select="substring-before(#Value,'||')"/>
</xsl:apply-templates>
</table>
</body>
</html>
</xsl:template>
<xsl:template match="Entry">
<xsl:if test="position() <= 10">
<tr>
<td>
<xsl:value-of select="substring-before(#Value,'||')"/>
</td>
<td>
<xsl:value-of select="format-number(substring(substring-after(#Value,'||||'),1,10),'#.#')"/>
</td>
</tr>
</xsl:if>
</xsl:template>
</xsl:stylesheet>

Answer 1

When you need to sum the values of multiple values on XSLT 1.0 you have to rely on recursion [EDIT: in XSLT 1.0 the function sum it is also available] (in XSLT 2.0 there is an XPath function sum()).
The following template performs the sum of the given elements through the elements-to-sum parameter, extracting the value to sum from the attribute #Value as you specified.
<?xml version="1.0" encoding="utf-8" ?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
<xsl:output method="html" />
<xsl:template match="TopHoldings">
<table>
<xsl:call-template name="sum">
<xsl:with-param name="elements-to-sum"
select="Entry" />
</xsl:call-template>
</table>
</xsl:template>
<xsl:template name="sum">
<xsl:param name="elements-to-sum" />
<xsl:param name="sum" select="'0'" />
<!-- Store in variables the following operations to avoid performing them more than once -->
<xsl:variable name="current-element" select="$elements-to-sum[1]" />
<xsl:variable name="current-value" select="format-number(substring(substring-after($current-element/#Value,'||||'),1,10),'#.#')" />
<!-- Output the table row -->
<tr>
<td><xsl:value-of select="substring-before($current-element/#Value, '||')" /></td>
<td><xsl:value-of select="$current-value" /></td>
</tr>
<!-- Determine whether continue -->
<xsl:choose>
<!-- Case END: we have just one element to sum so we perform the sum and we output the desired result -->
<xsl:when test="count($elements-to-sum) = 1">
<tr>
<td>Result:</td>
<td><xsl:value-of select="$current-value + $sum" /></td>
</tr>
</xsl:when>
<!-- Case RECURSION : we call this template again adding the current value to the sum and removing the first element from the parameter elements-to-sum -->
<xsl:otherwise>
<xsl:call-template name="sum">
<xsl:with-param name="elements-to-sum"
select="$elements-to-sum[position() > 1]" />
<xsl:with-param name="sum"
select="$sum + $current-value" />
</xsl:call-template>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>
I assumed that you wanted to display the result of the sum as a new row in the same table, if that is not the case and you want to display the result elsewhere the solution would be slightly different. Tell me if this solution is acceptable to you or you need to display the sum outside the element.
NOTE: Instead of doing those 'complex' string operations in the attribute #Value, I would consider splitting all the information within that attribute into different attributes.

Answer 2

Just use the XPath function sum(), it is available in both XPath 2.0 for XSLT 2.0 and XPath 1.0 for XSLT 1.0 as described in http://www.w3.org/TR/xpath/#function-sum. If the numbers you want to get the sum of are attributes "Value" to an element "Entry" use sum(//Entry/#Value)" to grab all and sum up. Change this to get the 10 elements you want in your xml data.