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    <p>Knowing nothing else about your input data (I have no idea why you chose <em>not to use actual XML</em>), I'm going to have to to guess a little:</p> <pre><code>&lt;Budget&gt; &lt;Table1&gt; &lt;AllocID&gt;1000&lt;/AllocID&gt; &lt;AllocID&gt;2000&lt;/AllocID&gt; &lt;AllocID&gt;3000&lt;/AllocID&gt; &lt;/Table1&gt; &lt;Table2&gt; &lt;AllocID&gt;1000&lt;/AllocID&gt; &lt;AllocID&gt;2000&lt;/AllocID&gt; &lt;/Table2&gt; &lt;/Budget&gt; </code></pre> <p>Easiest is the <a href="http://www.w3.org/TR/xpath#function-sum" rel="nofollow noreferrer">XPath <code>sum()</code> function</a> along with the right XPath expression:</p> <pre><code>&lt;!-- this will return 3000 for the above input --&gt; &lt;xsl:template match="/" &gt; &lt;xsl:value-of select=" sum(Budget/Table1/AllocID[. = //Budget/Table2/AllocID]) " /&gt; &lt;/xsl:template&gt; </code></pre> <p>Running sums can also be calculated with a recursive function, like this:</p> <pre><code>&lt;!-- this will also return 3000 for the above input --&gt; &lt;xsl:template match="/" &gt; &lt;xsl:call-template name="total"&gt; &lt;xsl:with-param name="nodes" select=" Budget/Table1/AllocID[. = //Budget/Table2/AllocID] " /&gt; &lt;/xsl:call-template&gt; &lt;/xsl:template&gt; &lt;xsl:template name="total"&gt; &lt;xsl:param name="nodes" /&gt; &lt;xsl:choose&gt; &lt;!-- either there is something to calculate... --&gt; &lt;xsl:when test="string(number($nodes[1])) != 'NaN'"&gt; &lt;xsl:variable name="subtotal"&gt; &lt;xsl:call-template name="total"&gt; &lt;xsl:with-param name="nodes" select="$nodes[position() &amp;gt; 1]" /&gt; &lt;/xsl:call-template&gt; &lt;/xsl:variable&gt; &lt;xsl:value-of select="number($nodes[1]) + $subtotal" /&gt; &lt;/xsl:when&gt; &lt;!-- ...or we assume 0 --&gt; &lt;xsl:otherwise&gt; &lt;xsl:value-of select="0" /&gt; &lt;/xsl:otherwise&gt; &lt;/xsl:choose&gt; &lt;/xsl:template&gt; </code></pre> <p>This is slower, but allows for greater flexibility in the calculation process. You can replace all the non-numeric values with 0, for example. Or use different values of the given nodes according to your own rules.</p>
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    1. COThanks for your suggestions. I was able to use the first one with slight modification: sum(Budget/Table1[./AllocID = //Budget/Table2/AllocID]/Amount). Also updated the question with xml for future readers.
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    2. COThanks - that came in handy
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    3. COOne thing I had to add was a check for zero as follows <xsl:when test="number($nodes[1]) or $nodes[1] = 0">
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