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    copied!<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt; &lt;xsl:output method="xml" indent="yes"/&gt; &lt;xsl:template match="/"&gt; &lt;Target Sum="{sum(FOO/BAR)}" /&gt; &lt;/xsl:template&gt; </code></pre> <p></p> <p><strong>EDIT:</strong></p> <p>This is a bit verbose, and there is probably a more elegant way to do it, but essentially I have a named template here that recursively calls itself to calculate the sum after the hard-coded mapping occurs:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt; &lt;xsl:output method="xml" indent="yes"/&gt; &lt;xsl:template match="/"&gt; &lt;Target&gt; &lt;xsl:attribute name="Sum"&gt; &lt;xsl:call-template name="GetSum"&gt; &lt;xsl:with-param name="CurrentNode" select="FOO/BAR[position()=1]"/&gt; &lt;/xsl:call-template&gt; &lt;/xsl:attribute&gt; &lt;/Target&gt; &lt;/xsl:template&gt; &lt;xsl:template name="GetSum"&gt; &lt;xsl:param name="CurrentNode"/&gt; &lt;xsl:param name="Number" select="0"/&gt; &lt;xsl:variable name="Recursive_Result"&gt; &lt;xsl:variable name="MappedNumber"&gt; &lt;xsl:choose&gt; &lt;xsl:when test="$CurrentNode/. = 'x'"&gt;1&lt;/xsl:when&gt; &lt;xsl:when test="$CurrentNode/. = 'y'"&gt;2&lt;/xsl:when&gt; &lt;xsl:when test="$CurrentNode/. = 'z'"&gt;3&lt;/xsl:when&gt; &lt;xsl:otherwise&gt;0&lt;/xsl:otherwise&gt; &lt;/xsl:choose&gt; &lt;/xsl:variable&gt; &lt;!-- if there is a next sibling, recursively call GetSum --&gt; &lt;xsl:choose&gt; &lt;xsl:when test="$CurrentNode/following-sibling::BAR[1]"&gt; &lt;xsl:call-template name="GetSum"&gt; &lt;xsl:with-param name="CurrentNode" select="$CurrentNode/following-sibling::BAR[1]"/&gt; &lt;xsl:with-param name="Number"&gt; &lt;xsl:value-of select="$MappedNumber"/&gt; &lt;/xsl:with-param&gt; &lt;/xsl:call-template&gt; &lt;/xsl:when&gt; &lt;xsl:otherwise&gt; &lt;xsl:value-of select="$MappedNumber"/&gt; &lt;/xsl:otherwise&gt; &lt;/xsl:choose&gt; &lt;/xsl:variable&gt; &lt;!-- add the recursive_result to the number passed into the template. this will eventually build a sum --&gt; &lt;xsl:value-of select="$Recursive_Result + $Number"/&gt; &lt;/xsl:template&gt; &lt;/xsl:stylesheet&gt; </code></pre>
 

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